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You searched for: Journal name Biogeochemistry Remove constraint Journal name: Biogeochemistry Subject dissolved organic carbon Remove constraint Subject: dissolved organic carbon Subject term biogeochemistry Remove constraint Subject term: biogeochemistry
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1. Photodegradation of DOC in a shallow prairie wetland: evidence from seasonal changes in DOC optical properties and chemical characteristics

Author:
Marley J. Waiser; Richard D. Robarts
Source:
Biogeochemistry 2004 v.69 no.2 pp. 263-284
ISSN:
0168-2563
Subject:
resins; seasonal variation; filtration; dissolved organic carbon; mass spectrometry; optical properties; ultraviolet radiation; prairies; fluorescence; hydrology; molecular weight; solar radiation; autumn; photolysis; biogeochemistry; wetlands; nuclear magnetic resonance spectroscopy; mixing; absorption; spring
Abstract:
... Wetlands across the Canadian prairies are typically shallow (<1.0 m) and exhibit high dissolved organic carbon (DOC) concentrations (>10 mg l⁻¹). Studies have shown that DOC in such shallow wetlands is not as reliable an indicator of ultraviolet radiation (UVR) attenuation as it is in clearwater. Changes in DOC character and composition as a result of sunlight exposure might provide a reasonable e ...
DOI:
10.1023/B:BIOG.0000031048.20050.4e

2. The influence of catchment characteristics on the seasonality of carbon and nitrogen species concentrations in upland rivers of Northern Scotland

Author:
M.J. Clark; M.S. Cresser; R. Smart; P.J. Chapman; A.C. Edwards
Source:
Biogeochemistry 2004 v.68 no.1 pp. 1-19
ISSN:
0168-2563
Subject:
dissolved organic nitrogen; peat; watersheds; seasonal variation; dissolved organic carbon; forest soils; summer; land use; correlation; linear models; conifers; climate; winter; equations; air temperature; ammonium compounds; highlands; arable soils; biogeochemistry; humus; upland soils; rivers; regression analysis; rain; nitrates; Scotland
Abstract:
... Data from 13 catchments with no arable land in Northern Scotland were used to develop empirical linear regression models of average monthly NO₃ ⁻ concentrations and average summer and winter concentrations for NH₄ ⁺, dissolved organic N (DON) and dissolved organic carbon (DOC) as a function of catchment characteristics. All catchments displayed a pronounced seasonal NO₃ ⁻ cycle. Variation in month ...
DOI:
10.1023/B:BIOG.0000025733.07568.11

3. The stimulation of methylmercury production by decomposition of flooded birch leaves and jack pine needles

Author:
Britt D. Hall; Vincent L. St. Louis; R.A. (Drew) Bodaly
Source:
Biogeochemistry 2004 v.68 no.1 pp. 107-129
ISSN:
0168-2563
Subject:
plant tissues; lakes; byproducts; leaching; conifer needles; Pinus banksiana; dissolved organic carbon; methylmercury compounds; biogeochemistry; Betula; Ontario
Abstract:
... The link between methylmercury (MeHg) production and decomposition of flooded organic matter was examined using an enclosure experiment. Six plastic enclosures were filled with lake water containing low concentrations of dissolved organic carbon (146 µmol L⁻¹) and MeHg (0.02 ng L⁻¹) and anchored in a lake at the Experimental Lakes Area, northwestern Ontario. Either fresh birch leaves, fresh jack p ...
DOI:
10.1023/B:BIOG.0000025745.28447.8b

4. Stormflow Dynamics of Dissolved Organic Carbon and Total Dissolved Nitrogen in a Small Urban Watershed

Author:
Aaron M. Hook; J. Alan Yeakley
Source:
Biogeochemistry 2005 v.75 no.3 pp. 409-431
ISSN:
0168-2563
Subject:
total dissolved nitrogen; nitrogen; forested watersheds; spring; streams; base flow; surfaces; dissolved organic carbon; riparian areas; cities; biogeochemistry; storms; Oregon
Abstract:
... We examined patterns of dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) loading to a small urban stream during baseflow and stormflow. We hypothesized that lower DOC and TDN contributions from impervious surfaces would dilute natural hydrologic flowpath (i.e., riparian) contributions during storm events in an urban watershed, resulting in lower concentrations of DOC and TDN durin ...
DOI:
10.1007/s10533-005-1860-4

5. The Role of Iron and Dissolved Organic Carbon in the Absorption of Ultraviolet Radiation in Humic Lake Water

Author:
Kelly O. Maloney; Donald P. Morris; Carl O. Moses; Christopher L. Osburn
Source:
Biogeochemistry 2005 v.75 no.3 pp. 393-407
ISSN:
0168-2563
Subject:
absorption; aquatic ecosystems; biogeochemistry; dissolved organic carbon; iron; lakes; latitude; photosynthetically active radiation; sediments; solubility; surveys; ultraviolet radiation
Abstract:
... Absorption of solar ultraviolet radiation (UVR) in aquatic ecosystems is primarily controlled by dissolved organic carbon (DOC). The role of iron (Fe) has also been suggested to contribute to UVR attenuation either directly or by interactions with DOC. Here we present findings from three laboratory manipulations of Fe and DOC on changes to the dissolved UVR absorption (ad,₃₂₀) in a mid-latitude, d ...
DOI:
10.1007/s10533-005-1675-3

6. Composition and variations in the occurrence of dissolved free simple organic compounds of an unproductive lake ecosystem in northern Sweden

Author:
Jonsson, Anders; Ström, Lena; Åberg, Jan
Source:
Biogeochemistry 2007 v.82 no.2 pp. 153-163
ISSN:
0168-2563
Subject:
carbon dioxide; energy; winter; lakes; monosaccharides; free amino acids; aquatic environment; spring; streams; dissolved organic carbon; ecosystems; summer; biogeochemistry; Betula; molecular weight; carboxylic acids; forests; Sweden
Abstract:
... Low molecular weight organic carbon compounds are potentially important carbon and energy substrates to heterotrophic production in the aquatic environment. We studied the occurrence of dissolved free amino acids (AA), monosaccharides (CHO), and carboxylic acids (CA) in the subarctic Lake Diktar-Erik. The lake is unproductive with slightly humic water, and receives water via one major inlet stream ...
DOI:
10.1007/s10533-006-9060-4

7. Contrasting nutrient exports from a forested and an agricultural catchment in south-eastern Australia

Author:
Vink, S.; Ford, P. W.; Bormans, M.; Kelly, C.; Turley, C.
Source:
Biogeochemistry 2007 v.84 no.3 pp. 247-264
ISSN:
0168-2563
Subject:
agricultural watersheds; autumn; biogeochemistry; denitrification; dissolved organic carbon; evapotranspiration; forested watersheds; grazing; land use; nitrates; nitrogen; nutrients; pastures; phosphorus; plantation forestry; runoff; seasonal variation; spring; storms; stream flow; streams; summer; winter; Australia
Abstract:
... Dissolved organic carbon (DOC) and total and inorganic nitrogen and phosphorus concentrations were determined over 3 years in headwater streams draining two adjacent catchments. The catchments are currently under different land use; pasture/grazing vs plantation forestry. The objectives of the work were to quantify C and nutrient export from these landuses and elucidate the factors regulating expo ...
DOI:
10.1007/s10533-007-9113-3

8. Response of dissolved organic matter in the forest floor to long-term manipulation of litter and throughfall inputs

Author:
Kalbitz, Karsten; Meyer, Armin; Yang, Rong; Gerstberger, Pedro
Source:
Biogeochemistry 2007 v.86 no.3 pp. 301-318
ISSN:
0168-2563
Subject:
dissolved organic nitrogen; primary productivity; phenols; dissolved organic carbon; forests; long term experiments; throughfall; Fagus; organic soils; oxidation; hexoses; mineralization; mineral soils; leaching; climate change; biogeochemistry; microbial activity; fluorescence emission spectroscopy; forest litter; organic horizons; cupric oxide; pentoses; Germany
Abstract:
... Dissolved organic matter (DOM) contributes to organic carbon either stored in mineral soil horizons or exported to the hydrosphere. However, the main controls of DOM dynamics are still under debate. We studied fresh leaf litter and more decomposed organic material as the main sources of DOM exported from the forest floor of a mixed beech/oak forest in Germany. In the field we doubled and excluded ...
DOI:
10.1007/s10533-007-9161-8

9. Silicate weathering in temperate forest soils: insights from a field experiment

Author:
Williams, E. L.; Walter, L. M.; Ku, T. C. W.; Baptist, K. K.; Budai, J. M.; Kling, G. W.
Source:
Biogeochemistry 2007 v.82 no.2 pp. 111-126
ISSN:
0168-2563
Subject:
atmospheric deposition; temperate forests; watersheds; dissolved organic carbon; forest soils; field experimentation; disturbed soils; weathering; anions; sodium; carbonate minerals; plagioclase; climate; soil mineralogy; models; soil water; biogeochemistry; temperature; tree growth; silicon; quartz; pH; Michigan
Abstract:
... Few studies of silicate mineral weathering have been conducted in carbonate-bearing temperate forest soils. With climate and vegetation held constant, we compared soil mineralogy and major element chemistry of soil waters from a carbonate-free temperate aspen forest site in the Cheboygan watershed, northern Michigan, with that from carbonate-containing soils from experimental tree-growth chambers ...
DOI:
10.1007/s10533-006-9057-z

10. Sources and fates of dissolved organic carbon in lakes as determined by whole-lake carbon isotope additions

Author:
Bade, Darren L.; Carpenter, Stephen R.; Cole, Jonathan J.; Pace, Michael L.; Kritzberg, Emma; Van de Bogert, Matthew C.; Cory, Rose M.; McKnight, Diane M.
Source:
Biogeochemistry 2007 v.84 no.2 pp. 115-129
ISSN:
0168-2563
Subject:
lakes; dissolved organic carbon; biogeochemistry; stable isotopes; spectroscopy; bacteria; trophic relationships
Abstract:
... Four whole-lake inorganic ¹³C addition experiments were conducted in lakes of differing trophic status. Inorganic ¹³C addition enriched algal carbon in ¹³C and changed the [graphic removed] C-DOC by +1.5[per thousand] to +9.5[per thousand], depending on the specific lake. This change in [graphic removed] C-DOC represented a significant input of algal DOC that was not completely consumed by bacteri ...
DOI:
10.1007/s10533-006-9013-y

11. The mobilisation of phosphorus, organic carbon and ammonium in the initial stage of fen rewetting (a case study from NE Germany)

Author:
Zak, Dominik; Gelbrecht, Jörg
Source:
Biogeochemistry 2007 v.85 no.2 pp. 141-151
ISSN:
0168-2563
Subject:
peat; fens; sodium hydroxide; sulfates; samplers; flooded conditions; dissolved organic carbon; biogeochemistry; case studies; dialysis; phosphorus; Germany
Abstract:
... Currently, more than 10,000 ha of fens have been rewetted to re-establish their function as nutrient sinks in NE Germany. However, field investigations reveal that porewater concentrations of P, dissolved organic carbon (DOC) and ammonium in rewetted fens are orders of magnitude larger than under pristine conditions. Hence, the objective of this study was to investigate the reasons behind enhanced ...
DOI:
10.1007/s10533-007-9122-2

12. The role of iron in the bacterial degradation of organic matter derived from Phaeocystis antarctica

Author:
Becquevort, S.; Lancelot, C.; Schoemann, V.
Source:
Biogeochemistry 2007 v.83 no.1-3 pp. 119-135
ISSN:
0168-2563
Subject:
denaturing gradient gel electrophoresis; phytoplankton; community structure; monitoring; iron; bioassays; regrowth; Phaeocystis; carbon nitrogen ratio; dissolved organic carbon; bacterial communities; hydrolysis; biogeochemistry; microbial growth; seawater; bacteria; Antarctic region
Abstract:
... In high-nutrient low-chlorophyll areas, bacterial degradation of organic matter may be iron-limited. The response of heterotrophic bacteria to Fe addition may be directly controlled by Fe availability and/or indirectly controlled through the effect of enhanced phytoplankton productivity and the subsequent supply of organic matter suitable for bacteria. In the present study, the role of Fe on bacte ...
DOI:
10.1007/s10533-007-9079-1

13. Changes in the character of DOC in streams during storms in two Midwestern watersheds with contrasting land uses

Author:
Vidon, Philippe; Wagner, Laura E.; Soyeux, Emmanuel
Source:
Biogeochemistry 2008 v.88 no.3 pp. 257-270
ISSN:
0168-2563
Subject:
absorbance; agricultural watersheds; base flow; biogeochemistry; dissolved organic carbon; fluorescence; land use; landscapes; lignin; macropore flow; mineral soils; overland flow; soil profiles; spring; storms; streams; tracer techniques
Abstract:
... Dissolved organic carbon (DOC) dynamics in streams is important, yet few studies focus on DOC dynamics in Midwestern streams during storms. In this study, stream DOC dynamics during storms in two Midwestern watersheds with contrasting land uses, the change in character of stream DOC during storms, and the usability of DOC as a hydrologic tracer in artificially drained landscapes of the Midwest are ...
DOI:
10.1007/s10533-008-9207-6

14. Does elevated nitrogen deposition or ecosystem recovery from acidification drive increased dissolved organic carbon loss from upland soil? A review of evidence from field nitrogen addition experiments

Author:
Evans, Chris D.; Goodale, Christine L.; Caporn, Simon J. M.; Dise, Nancy B.; Emmett, Bridget A.; Fernandez, Ivan J.; Field, Chris D.; Findlay, Stuart E. G.; Lovett, Gary M.; Meesenburg, Henning; Moldan, Filip; Sheppard, Lucy J.
Source:
Biogeochemistry 2008 v.91 no.1 pp. 13-35
ISSN:
0168-2563
Subject:
atmospheric deposition; ammonium salts; acidity; acidification; sodium nitrate; sulfur; upland soils; nitrogen; dissolved organic carbon; ecosystems; soil pH; biogeochemistry; acid-base balance; tree mortality; adsorption; Europe; North America
Abstract:
... Dissolved organic carbon (DOC) concentrations have risen in upland waters across large areas of Europe and North America. Two proposed drivers of these increases are (1) deposition of atmospheric pollutant nitrogen (N) with consequent effects on plant and decomposer carbon dynamics, and (2) soil recovery from acidification associated with decreasing sulphur deposition. Examination of 12 European a ...
DOI:
10.1007/s10533-008-9256-x

15. Fluorescence characteristics and biodegradability of dissolved organic matter in forest and wetland soils from coastal temperate watersheds in southeast Alaska

Author:
Fellman, Jason B.; D'Amore, David V.; Hood, Eran; Boone, Richard D.
Source:
Biogeochemistry 2008 v.88 no.2 pp. 169-184
ISSN:
0168-2563
Subject:
absorbance; biodegradability; biogeochemistry; chemical concentration; correlation; dissolved organic carbon; fluorescence; fluorescence emission spectroscopy; forest soils; forests; highlands; models; piezometers; seasonal variation; soil solution; soil water; streams; watersheds; wetland soils; wetlands; Alaska
Abstract:
... Understanding how the concentration and chemical quality of dissolved organic matter (DOM) varies in soils is critical because DOM influences an array of biological, chemical, and physical processes. We used PARAFAC modeling of excitation-emission fluorescence spectroscopy, specific UV absorbance (SUVA₂₅₄) and biodegradable dissolved organic carbon (BDOC) incubations to investigate the chemical qu ...
DOI:
10.1007/s10533-008-9203-x

16. Porewater biogeochemistry and soil metabolism in dwarf red mangrove habitats (Twin Cays, Belize)

Author:
Lee, Rosalynn Y.; Porubsky, William P.; Feller, Ilka C.; McKee, Karen L.; Joye, Samantha B.
Source:
Biogeochemistry 2008 v.87 no.2 pp. 181-198
ISSN:
0168-2563
Subject:
manganese; islands; evaporation; seasonal variation; dissolved organic carbon; phosphorus; metabolites; inventories; iron; surface water; wet season; carbon footprint; dry season; mineralization; metabolism; energy; nitrification; soil; biogeochemistry; denitrification; nitrous oxide; methane production; salinity; nitrogen; methane; rain; pH; habitats; nitrates; Belize
Abstract:
... Seasonal variability in biogeochemical signatures was used to elucidate the dominant pathways of soil microbial metabolism and elemental cycling in an oligotrophic mangrove system. Three interior dwarf mangrove habitats (Twin Cays, Belize) where surface soils were overlain by microbial mats were sampled during wet and dry periods of the year. Porewater equilibration meters and standard biogeochemi ...
DOI:
10.1007/s10533-008-9176-9

17. Changes in water colour between 1986 and 2006 in the headwaters of the River Nidd, Yorkshire, UK

Author:
Chapman, Pippa J.; McDonald, Adrian T.; Tyson, Rosa; Palmer, Sheila M.; Mitchell, Gordon; Irvine, Brian
Source:
Biogeochemistry 2010 v.101 no.1-3 pp. 281-294
ISSN:
0168-2563
Subject:
adsorption; biogeochemistry; color; dissolved organic carbon; hydrochemistry; mineral soils; pH; peat; rivers; runoff; silicon; soil horizons; statistical analysis; subwatersheds; sulfur; temporal variation; England
Abstract:
... This study compares the spatial and temporal variability of water colour for fifteen sub-catchments of the River Nidd, northeast England, in 1986 and 2006/2007. Between 1986 and 2006/2007, mean annual water colour increased in all the sub-catchments. However, there was considerable variation in the increase, which ranged from 22 to 155%. Statistical analysis revealed that the sub-catchments could ...
DOI:
10.1007/s10533-010-9474-x

18. Effect of pH and dissolved organic matter on the abundance of nirK and nirS denitrifiers in spruce forest soil

Author:
Bárta, Jiří; Melichová, Tereza; Vaněk, Daniel; Picek, Tomáš; Šantrůčková, Hana
Source:
Biogeochemistry 2010 v.101 no.1-3 pp. 123-132
ISSN:
0168-2563
Subject:
biogeochemistry; denitrifying bacteria; dissolved organic carbon; forest soils; forests; genes; humus; leaching; nitrates; nitrogen; nutrients; pH; quantitative polymerase chain reaction; soil acidification; soil sampling
Abstract:
... Acid N depositions in the Bohemian Forest during the second half of the last century caused enormous soil acidification which led to the leaching of essential nutrients including nitrates. We investigated the effect of dissolved organic matter (DOM) and pH on the abundance of 16S RDNA, nirK and nirS gene copies in four spruce forest sites. Soil samples for molecular based quantification (qPCR) wer ...
DOI:
10.1007/s10533-010-9430-9

19. Effects of storm events on mobilisation and in-stream processing of dissolved organic matter (DOM) in a Welsh peatland catchment

Author:
Austnes, Kari; Evans, Christopher D.; Eliot-Laize, Caroline; Naden, Pamela S.; Old, Gareth H.
Source:
Biogeochemistry 2010 v.99 no.1-3 pp. 157-173
ISSN:
0168-2563
Subject:
Sphagnum; absorbance; biogeochemistry; dissolved organic carbon; dissolved organic nitrogen; diurnal variation; factor analysis; fluorescence; pH; peatlands; soil water; statistical models; storms; streams; watersheds
Abstract:
... Peatlands are important contributors of dissolved organic matter (DOM) to downstream aquatic systems. We investigated the effects of storm events on dissolved organic carbon (DOC) concentrations and DOM quality in a stream draining a Welsh peatland catchment. Intensive stream samples were collected and analysed for pH, DOC, dissolved organic nitrogen (DON), absorbance and fluorescence. Soil water ...
DOI:
10.1007/s10533-009-9399-4

20. Event controlled DOC export from forested watersheds

Author:
Raymond, Peter A.; Saiers, James E.
Source:
Biogeochemistry 2010 v.100 no.1-3 pp. 197-209
ISSN:
0168-2563
Subject:
biogeochemistry; climate; dissolved organic carbon; ecosystems; forested watersheds; hydrograph; melting; snowmelt; storms; streams; temperature; wetlands; Eastern United States
Abstract:
... We performed a meta-data analysis to investigate the importance of event based fluxes to DOC export from forested watersheds. A total of 30 small eastern United States forested watersheds with no wetland component, with a total of 5,176 DOC and accompanying discharge measurements were used in this analysis. There is a clear increase in DOC concentration during hydrologic events (storms and snow me ...
DOI:
10.1007/s10533-010-9416-7

21. High precipitation causes large fluxes of dissolved organic carbon and nitrogen in a subtropical montane Chamaecyparis forest in Taiwan

Author:
Schmidt, Bettina H. M.; Wang, Chiao-Ping; Chang, Shih-Chieh; Matzner, Egbert
Source:
Biogeochemistry 2010 v.101 no.1-3 pp. 243-256
ISSN:
0168-2563
Subject:
Chamaecyparis obtusa var. formosana; biogeochemistry; dissolved organic carbon; forest ecosystems; forest litter; forest soils; forests; nitrogen; nitrogen content; seepage; throughfall; Taiwan
Abstract:
... Fluxes of dissolved organic carbon (DOC) and nitrogen (DON) may play an important role for losses of C and N from the soils of forest ecosystems, especially under conditions of high precipitation. We studied DOC and DON fluxes and concentrations in relation to precipitation intensity in a subtropical montane Chamaecyparis obtusa var. formosana forest in Taiwan. Our objective was, to quantify DOC a ...
DOI:
10.1007/s10533-010-9470-1

22. Influences of dissolved organic carbon on stream water chemistry in two forested catchments in central Sweden

Author:
Norström, Sara H.; Vestin, Jenny L. K.; Bylund, Dan; Lundström, Ulla S.
Source:
Biogeochemistry 2010 v.101 no.1-3 pp. 229-241
ISSN:
0168-2563
Subject:
aluminum; biogeochemistry; calcium; cations; dissolved organic carbon; drainage; forested watersheds; growing season; hydrochemistry; iron; lactic acid; magnesium; molecular weight; pH; stream channels; wetlands; Sweden
Abstract:
... Stream water chemistry in two headwater streams draining two small, adjacent catchments in Bispgården, central Sweden was studied during the 2003 and 2004 growing seasons. The two catchments closely resemble each other in regard to size, shape and drainage density, with the major difference found in the area of wetland lining the streambeds. The emphasis of the study was to investigate the stream ...
DOI:
10.1007/s10533-010-9469-7

23. Linking monitoring and modelling: can long-term datasets be used more effectively as a basis for large-scale prediction

Author:
Evans, Chris D.; Cooper, David M.; Monteith, Donald T.; Helliwell, Rachel C.; Moldan, Filip; Hall, Jane; Rowe, Edwin C.; Cosby, Bernard J.
Source:
Biogeochemistry 2010 v.101 no.1-3 pp. 211-227
ISSN:
0168-2563
Subject:
biogeochemistry; data collection; dissolved organic carbon; highlands; issues and policy; lakes; landscapes; models; monitoring; neutralization; nitrates; prediction; solutes; sulfates; surface water; surveys; United Kingdom
Abstract:
... Data from long-term monitoring sites are vital for biogeochemical process understanding, and for model development. Implicitly or explicitly, information provided by both monitoring and modelling must be extrapolated in order to have wider scientific and policy utility. In many cases, large-scale modelling utilises little of the data available from long-term monitoring, instead relying on simplifi ...
DOI:
10.1007/s10533-010-9413-x

24. Seasonal variation of water extractable aluminium forms in acidified forest organic soils under different vegetation cover

Author:
Tejnecký, Václav; Drábek, Ondřej; Borůvka, Luboš; Nikodem, Antonín; Kopáč, Jan; Vokurková, Petra; Šebek, Ondřej
Source:
Biogeochemistry 2010 v.101 no.1-3 pp. 151-163
ISSN:
0168-2563
Subject:
Fagus; acidification; aluminum; biogeochemistry; dissolved organic carbon; forest soils; forests; mountains; organic soils; pH; seasonal variation; soil horizons; vegetation cover
Abstract:
... The Jizera Mountains area is affected by natural and anthropogenic acidification processes. The effect of acidification is reflected by presence of elevated amount of different Al forms in soil horizons. Changes of water extractable forms of Al (total [graphic removed] , species: Al(X)¹⁺, Al(Y)²⁺ and Al³⁺) and other soil characteristics (e.g. DOC, pH) were investigated in forest soils from April t ...
DOI:
10.1007/s10533-010-9450-5

25. Sources and ages of dissolved organic matter in peatland streams: evidence from chemistry mixture modelling and radiocarbon data

Author:
Tipping, E.; Billett, M. F.; Bryant, C. L.; Buckingham, S.; Thacker, S. A.
Source:
Biogeochemistry 2010 v.100 no.1-3 pp. 121-137
ISSN:
0168-2563
Subject:
peat; radionuclides; winter; mixing; monitoring; calcium; models; peatlands; clay; spring; streams; dissolved organic carbon; biogeochemistry; groundwater; England
Abstract:
... Monitoring data over the period 1994-2007 were analysed for three streams (Cottage Hill Sike, CHS; Rough Sike, RS; Trout Beck, TB) draining blanket peat underlain by glacial clay and limestone-rich sub-strata at Moor House (Northern England). Dissolved organic carbon concentration, [DOC], showed complex relationships with both discharge and calcium concentration, [Ca]. A model based on [Ca] was co ...
DOI:
10.1007/s10533-010-9409-6

26. Variable flushing mechanisms and landscape structure control stream DOC export during snowmelt in a set of nested catchments

Author:
Pacific, Vincent J.; Jencso, Kelsey G.; McGlynn, Brian L.
Source:
Biogeochemistry 2010 v.99 no.1-3 pp. 193-211
ISSN:
0168-2563
Subject:
biogeochemistry; dissolved organic carbon; groundwater; highlands; landscapes; riparian areas; snowmelt; streams; watersheds; wetlands; Montana; Rocky Mountain region
Abstract:
... Stream DOC dynamics during snowmelt have been the focus of much research, and numerous DOC mobilization and delivery mechanisms from riparian and upland areas have been proposed. However, landscape structure controls on DOC export from riparian and upland landscape elements remains poorly understood. We investigated stream and groundwater DOC dynamics across three transects and seven adjacent but ...
DOI:
10.1007/s10533-009-9401-1

27. Vertical change in dissolved organic carbon and oxygen at the water table region of an aquifer recharged with stormwater: biological uptake or mixing

Author:
Foulquier, Arnaud; Malard, Florian; Mermillod-Blondin, Florian; Datry, Thibault; Simon, Laurent; Montuelle, Bernard; Gibert, Janine
Source:
Biogeochemistry 2010 v.99 no.1-3 pp. 31-47
ISSN:
0168-2563
Subject:
aerobiosis; aquifers; biodegradability; biogeochemistry; dissolved organic carbon; dissolved oxygen; filtration; groundwater; mixing; oxygen; rain; sediments; stormwater; vadose zone; water table
Abstract:
... Decreases in dissolved organic carbon (DOC) and dissolved oxygen (DO) with increasing depth below the groundwater table are often considered as evidence for aerobic respiration; however, they may reflect mixing of infiltrating water and groundwater. We found that groundwater DOC concentration was on average 0.3 mg C l⁻¹ higher and DO concentration 1.5 mg O₂ l⁻¹ lower at recharge sites replenished ...
DOI:
10.1007/s10533-009-9388-7

28. Dissolved organic matter composition in a fragmented Mediterranean fluvial system under severe drought conditions

Author:
Vazquez, Eusebi; Amalfitano, Stefano; Fazi, Stefano; Butturini, Andrea
Source:
Biogeochemistry 2011 v.102 no.1-3 pp. 59-72
ISSN:
0168-2563
Subject:
autumn; bioavailability; biogeochemistry; dissolved organic carbon; drought; fluorescence; lentic systems; lotic systems; nitrogen content; optical properties; physicochemical properties; summer; surface water
Abstract:
... In Mediterranean regions, drought is one of the main factors shaping fluvial ecosystems. Droughts cause a shift from lotic to lentic conditions, triggering a gradual fragmentation of the longitudinal hydrological continuum, and a severe alteration of water chemical properties. However, within a biogeochemical perspective, little is known about how and to which extend droughts modify the chemical p ...
DOI:
10.1007/s10533-010-9421-x

29. Fluxes and budgets of Cd, Zn, Cu, Cr and Ni in a remote forested catchment in Germany

Author:
Huang, Jen-How; Ilgen, Gunter; Matzner, Egbert
Source:
Biogeochemistry 2011 v.103 no.1-3 pp. 59-70
ISSN:
0168-2563
Subject:
atmospheric deposition; biogeochemistry; cadmium; chromium; copper; dissolved organic carbon; ecosystems; equations; forest litter; forest soils; forested watersheds; forests; heavy metals; mineral soils; nickel; organic horizons; overland flow; pH; rain; runoff; soil depth; soil profiles; zinc; Germany
Abstract:
... The input of heavy metals by atmospheric deposition to forested watersheds substantially decreased during the last decades in many areas. The goal of our study was to identify the present sinks and sources of metals and factors influencing metal mobility at the catchment and soil profile scale. We determined concentrations and fluxes of Cd, Zn, Cu, Cr and Ni in precipitation, litterfall, soil solu ...
DOI:
10.1007/s10533-010-9447-0

30. Seasonal and hydrologic drivers of dissolved organic matter and nutrients in the upper Kuparuk River, Alaskan Arctic

Author:
Townsend-Small, Amy; McClelland, James W.; Max Holmes, R.; Peterson, Bruce J.
Source:
Biogeochemistry 2011 v.103 no.1-3 pp. 109-124
ISSN:
0168-2563
Subject:
ammonium compounds; biogeochemistry; correlation; dissolved organic carbon; nitrates; nitrogen; nutrients; phosphorus; rain; rivers; runoff; seasonal variation; snow; snowmelt; spring; streams; summer; temperature; watersheds; winter; Alaska; Arctic region
Abstract:
... As the planet warms, widespread changes in Arctic hydrology and biogeochemistry have been documented and these changes are expected to accelerate in the future. Improved understanding of the behavior of water-borne constituents in Arctic rivers with varying hydrologic conditions, including seasonal variations in discharge-concentration relationships, will improve our ability to anticipate future c ...
DOI:
10.1007/s10533-010-9451-4

31. Characterization of dissolved organic matter under contrasting hydrologic regimes in a subtropical watershed using PARAFAC model

Author:
Huasheng Hong; Liyang Yang; Weidong Guo; Fuli Wang; Xiangxiang Yu
Source:
Biogeochemistry 2012 v.109 no.1-3 pp. 163-174
ISSN:
0168-2563
Subject:
Dinophyceae; absorption; algal blooms; anthropogenic activities; biogeochemistry; dams (hydrology); dissolved organic carbon; drought; estuaries; fluorescence; freshwater; models; monsoon season; rivers; storms; subtropics; water pollution; watershed hydrology; watersheds; China
Abstract:
... Dissolved organic matter (DOM) was characterized during five basin-scale investigations (either after storms or in droughts) in Jiulong River, China that is affected by the Asian Monsoon, tropical storms and anthropogenic activities. Dissolved organic carbon concentration, DOM absorption and fluorescence (excitation-emission matrix spectra, EEMs) were measured. Parallel factor analysis (PARAFAC) o ...
DOI:
10.1007/s10533-011-9617-8

32. Sources and export fluxes of inorganic and organic carbon and nutrient species from the seasonally ice-covered Yukon River

Author:
Laodong Guo; Yihua Cai; Claude Belzile; Robie W. Macdonald
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 187-206
ISSN:
0168-2563
Subject:
watersheds; dissolved organic carbon; nutrients; groundwater; stable isotopes; weathering; solutes; ice; oxygen; sampling; stream flow; winter; leaching; soil; biogeochemistry; deuterium; silicates; snowmelt; rivers; nitrogen; spring; chemical speciation; river water; Arctic region
Abstract:
... Climate and environmental changes are having profound impacts on Arctic river basins, but the biogeochemical response remains poorly understood. To examine the effect of ice formation on temporal variations in composition and fluxes of carbon and nutrient species, monthly water and particulate samples collected from the lower Yukon River between July 2004 and September 2005 were measured for conce ...
DOI:
10.1007/s10533-010-9545-z

33. Bioavailability and size-fraction of dissolved organic carbon, nitrogen, and sulfur at the Arbutus Lake watershed, Adirondack Mountains, NY

Author:
Phil-Goo Kang; Myron J. Mitchell
Source:
Biogeochemistry 2013 v.115 no.1-3 pp. 213-234
ISSN:
0168-2563
Subject:
Arbutus; bacteria; bioavailability; biogeochemistry; dissolved organic carbon; lakes; molecular weight; nitrogen; spatial variation; streams; sulfur; temporal variation; ultrafiltration; watersheds; Adirondacks; New York
Abstract:
... The heterogeneity of DOM is closely linked with the various sources and the diversity of biogeochemical processes. We studied the spatial and temporal patterns of the quantity (bioavailable [B-] and refractory concentrations by laboratory incubations) and quality (δ¹³C, aromaticity, and size-fraction by ultrafiltration [low molecular weight (LMW) < 1 kDa and high molecular weight (HMW) > 1 kDa]) o ...
DOI:
10.1007/s10533-013-9829-1

34. Impact of snowpack decrease on net nitrogen mineralization and nitrification in forest soil of northern Japan

Author:
H. Shibata; Y. Hasegawa; T. Watanabe; K. Fukuzawa
Source:
Biogeochemistry 2013 v.116 no.1-3 pp. 69-82
ISSN:
0168-2563
Subject:
biogeochemistry; climate change; dissolved organic carbon; forest soils; laboratory experimentation; leaching; melting; mineral soils; mineralization; mixed forests; nitrates; nitrification; nitrogen; snow; snowmelt; snowpack; soil microorganisms; soil water; temperature; water supply; winter; Japan
Abstract:
... Winter climate change is an important environmental driver that alters the biogeochemical processes of forest soils. The decrease in snowpack amplifies soil freeze–thaw cycles and decreases the snowmelt water supply to soil. This study examined how snow decrease affects nitrogen (N) mineralization and nitrification in forest soil in northern Japan by conducting an in situ experimental snowpack man ...
DOI:
10.1007/s10533-013-9882-9

35. Environmental dynamics of dissolved black carbon in wetlands

Author:
Yan Ding; Kaelin M. Cawley; Catia Nunes da Cunha; Rudolf Jaffé
Source:
Biogeochemistry 2014 v.119 no.1-3 pp. 259-273
ISSN:
0168-2563
Subject:
dry season; wetlands; linear models; surface area; oceans; surveys; combustion; burning; coasts; dissolved organic carbon; biogeochemistry; ecosystems; biomass; hydrology; chemical structure; Pantanal; Brazil; Botswana; Florida
Abstract:
... Wetlands are ecosystems commonly characterized by elevated levels of dissolved organic carbon (DOC), and although they cover a surface area less than 2 % worldwide, they are an important carbon source representing an estimated 15 % of global annual DOC flux to the oceans. Because of their unique hydrological characteristics, fire can be an important ecological driver in pulsed wetland systems. Con ...
DOI:
10.1007/s10533-014-9964-3

36. A new conceptual model on the fate and controls of fresh and pyrolized plant litter decomposition

Author:
Jennifer L. Soong; William J Parton; Francisco Calderon; Eleanor E. Campbell; M. Francesca Cotrufo
Source:
Biogeochemistry 2015 v.124 no.1-3 pp. 27-44
ISSN:
0168-2563
Subject:
terrestrial ecosystems; lignocellulose; plant litter; models; leaching; cellulose; dissolved organic carbon; infrared spectroscopy; biogeochemistry; lignin; leaves
Abstract:
... In recent years, litter decomposition studies have begun to move beyond the concept of mass loss to consider the fate of fresh and pyrolized decomposing plant material in the ecosystem. However, these concepts have yet to be incorporated into conceptual models of litter decomposition. Understanding how fresh and pyrolized plant litter chemical traits control the partitioning of mass loss to dissol ...
DOI:
10.1007/s10533-015-0079-2

37. After the flood: changing dissolved organic carbon bioavailability and bacterial growth following inflows to estuaries

Author:
James N. Hitchcock; Simon M. Mitrovic
Source:
Biogeochemistry 2015 v.124 no.1-3 pp. 219-233
ISSN:
0168-2563
Subject:
absorbance; bacteria; base flow; bioassays; bioavailability; biogeochemistry; dissolved organic carbon; estuaries; floods; freshwater; microbial growth; nitrogen; nutrients; phosphorus; rivers; ultraviolet radiation; variance
Abstract:
... Freshwater inflows play an important role in delivering dissolved organic carbon (DOC) to estuaries. Although considerable DOC can be delivered to estuaries during episodic inflow events, such as floods, little information exists on how the bioavailability of DOC may change during these periods. In this study we used in vitro bioassay incubation experiments to examine how bioavailability changed f ...
DOI:
10.1007/s10533-015-0094-3

38. Deeper snow alters soil nutrient availability and leaf nutrient status in high Arctic tundra

Author:
Philipp R. Semenchuk; Bo Elberling; Cecilie Amtorp; Judith Winkler; Sabine Rumpf; Anders Michelsen; Elisabeth J. Cooper
Source:
Biogeochemistry 2015 v.124 no.1-3 pp. 81-94
ISSN:
0168-2563
Subject:
Bistorta vivipara; tundra; dissolved organic carbon; Luzula; nitrogen content; Salix; cold season; photosynthesis; leaves; mineralization; plant growth; ammonium compounds; soil; climate change; biogeochemistry; temperature; meadows; soil nutrients; landscapes; nitrogen; nutrient availability; soil heating; snow; growing season; chlorophyll; nitrates; Arctic region
Abstract:
... Nitrogen (N) mineralization, nutrient availability, and plant growth in the Arctic are often restricted by low temperatures. Predicted increases of cold-season temperatures may be important for plant nutrient availability and growth, given that N mineralization is also taking place during the cold season. Changing nutrient availability may be reflected in plant N and chlorophyll content and lead t ...
DOI:
10.1007/s10533-015-0082-7

39. Dissolved black carbon in boreal forest and glacial rivers of central Alaska: assessment of biomass burning versus anthropogenic sources

Author:
Yan Ding; Youhei Yamashita; Jeremy Jones; Rudolf Jaffé
Source:
Biogeochemistry 2015 v.123 no.1-2 pp. 15-25
ISSN:
0168-2563
Subject:
atmospheric deposition; rivers; boreal forests; forest fires; marine environment; forested watersheds; glaciers; soil; streams; global warming; latitude; burning; anthropogenic activities; dissolved organic carbon; biogeochemistry; ecosystems; biomass; fossil fuels; Alaska
Abstract:
... Boreal forests are thought to be an important source and sink for pyrogenic carbon, or black carbon (BC), as fire is very common in this type of ecosystem. However, the reported soil BC content in boreal forests is low, suggesting active removal processes of soil BC possibly through transfer to the dissolved phase. In this study, dissolved black carbon (DBC) concentrations from samples collected f ...
DOI:
10.1007/s10533-014-0050-7

40. Factors influencing critical and target loads for the acidification of lake–watersheds in the Adirondack region of New York

Author:
Qingtao Zhou; Charles T. Driscoll; Timothy J. Sullivan; Afshin Pourmokhtarian
Source:
Biogeochemistry 2015 v.124 no.1-3 pp. 353-369
ISSN:
0168-2563
Subject:
acidification; acidity; air; aquatic ecosystems; atmospheric deposition; biogeochemistry; critical load; cutting; dissolved organic carbon; drainage; elevated atmospheric gases; emissions; evapotranspiration; forests; lakes; landscapes; logging; neutralization; nitrates; organic acids and salts; photosynthesis; watersheds; Adirondacks; New York
Abstract:
... Critical loads (CLs) and target loads (TLs) are tools used to guide air emissions control strategies for recovery of forest and aquatic ecosystems impacted by elevated atmospheric deposition. We use the dynamic hydrochemical model-PnET-BGC (photosynthesis evapotranspiration biogeochemical) to evaluate biophysical factors that affect CLs and TLs of acidity for the Constable Pond watershed, as an ex ...
DOI:
10.1007/s10533-015-0102-7

41. Fluvial radiocarbon and its temporal variability during contrasting hydrological conditions

Author:
Jörg Tittel; Christin Müller; Martin Schultze; Andreas Musolff; Kay Knöller
Source:
Biogeochemistry 2015 v.126 no.1-2 pp. 57-69
ISSN:
0168-2563
Subject:
temporal variation; atmospheric deposition; pastures; tillage; streams; arable soils; base flow; dissolved organic carbon; riparian areas; watershed hydrology; biogeochemistry; storms; watersheds; land use; Germany
Abstract:
... To study the significance of land use and catchment hydrology for the age of exported carbon, we measured the radiocarbon abundances in two mountainous streams in Germany. The Hassel catchment was characterized by wider-stretched riparian areas and by a significant contribution of arable land and pasture to land use compared to the Rappbode catchment. Although soil cultivation is considered to mob ...
DOI:
10.1007/s10533-015-0137-9

42. Longitudinal shifts in dissolved organic matter chemogeography and chemodiversity within headwater streams: a river continuum reprise

Author:
Jennifer J. Mosher; Louis A. Kaplan; David C. Podgorski; Amy M. McKenna; Alan G. Marshall
Source:
Biogeochemistry 2015 v.124 no.1-3 pp. 371-385
ISSN:
0168-2563
Subject:
biogeochemistry; dissolved organic carbon; ecology; forested watersheds; groundwater; mass spectrometry; rivers; streams
Abstract:
... We tested a long-standing hypothesis within river ecology, predicted by the River Continuum Concept, that dissolved organic matter (DOM) diversity decreases with stream order. We measured DOM molecular composition across three stream orders in the headwaters of well characterized forested catchments with ultrahigh-resolution mass spectrometry to assess DOM chemogeography and chemodiversity over th ...
DOI:
10.1007/s10533-015-0103-6

43. Modelling landscape controls on dissolved organic carbon sources and fluxes to streams

Author:
J. J. Dick; D. Tetzlaff; C. Birkel; C. Soulsby
Source:
Biogeochemistry 2015 v.122 no.2-3 pp. 361-374
ISSN:
0168-2563
Subject:
antecedent moisture; biogeochemistry; dissolved organic carbon; drainage; groundwater; hydrochemistry; landscapes; models; riparian areas; streams; watersheds
Abstract:
... Catchment dissolved organic carbon (DOC) fluxes are governed by complex interactions, which control biogeochemical processes generating DOC and hydrological connectivity, facilitating transport through the landscape to streams. This paper presents the development of a coupled hydrological-biogeochemical model for a northern watershed with organic-rich soils, to simulate daily DOC concentrations. T ...
DOI:
10.1007/s10533-014-0046-3

44. Origin-specific molecular signatures of dissolved organic matter in the Lena Delta

Author:
I. Dubinenkov; R. Flerus; P. Schmitt-Kopplin; G. Kattner; B. P. Koch
Source:
Biogeochemistry 2015 v.123 no.1-2 pp. 1-14
ISSN:
0168-2563
Subject:
biogeochemistry; dissolved organic carbon; ice; lakes; mass spectrometry; melting; permafrost; rivers; snowmelt; streams; surface water; Arctic region
Abstract:
... Large Arctic rivers discharge significant amounts of dissolved organic matter (DOM) into the Arctic Ocean. We sampled natural waters of the Lena River, the Buor-Khaya Bay (Laptev Sea), permafrost melt water creeks, ice complex melt water creeks and a lake. The goal of this study was to characterize the molecular DOM composition with respect to different water bodies within the Lena Delta. We aimed ...
DOI:
10.1007/s10533-014-0049-0

45. Origins and bioavailability of dissolved organic matter in groundwater

Author:
Yuan Shen; Francis H. Chapelle; Eric W. Strom; Ronald Benner
Source:
Biogeochemistry 2015 v.122 no.1 pp. 61-78
ISSN:
0168-2563
Subject:
aquifers; bioassays; bioavailability; biogeochemistry; chromatography; dissolved organic carbon; gamma-aminobutyric acid; groundwater; metabolism; models; molecular weight; optical properties; phenols; soil; surface water; water quality
Abstract:
... Dissolved organic matter (DOM) in groundwater influences water quality and fuels microbial metabolism, but its origins, bioavailability and chemical composition are poorly understood. The origins and concentrations of dissolved organic carbon (DOC) and bioavailable DOM were monitored during a long-term (2-year) study of groundwater in a fractured-rock aquifer in the Carolina slate belt. Surface pr ...
DOI:
10.1007/s10533-014-0029-4

46. Spatial controls on dissolved organic carbon in upland waters inferred from a simple statistical model

Author:
Donald T. Monteith; Peter A. Henrys; Chris D. Evans; Iain Malcolm; Ewan M. Shilland; M. G. Pereira
Source:
Biogeochemistry 2015 v.123 no.3 pp. 363-377
ISSN:
0168-2563
Subject:
primary productivity; watersheds; dissolved organic carbon; altitude; wetland soils; sulfur; surface water; statistical models; acid deposition; mineral soils; highlands; climate change; drawdown; biogeochemistry; wetlands; acidification; regression analysis; water treatment; rain; land management; United Kingdom
Abstract:
... Dissolved organic carbon (DOC) concentrations in upland surface waters in many northern hemisphere industrialised regions are at their highest in living memory, provoking debate over their “naturalness”. Because of the implications for drinking water treatment and supply there is increasing interest in the potential for mitigation through local land management, and for forecasting the likely impac ...
DOI:
10.1007/s10533-015-0071-x

47. Spatiotemporal dynamics of boreal landscapes with ecosystem engineers: beavers influence the biogeochemistry of small lakes

Author:
Mia Vehkaoja; Petri Nummi; Martti Rask; Tiina Tulonen; Lauri Arvola
Source:
Biogeochemistry 2015 v.124 no.1-3 pp. 405-415
ISSN:
0168-2563
Subject:
lakes; landscapes; ecosystem engineers; dissolved organic carbon; biogeochemistry; Castoridae; hydrochemistry; dissolved oxygen; Finland
Abstract:
... It has been suggested that beavers affect biogeochemical processes and the environment on a relatively large scale, thus acting as ecosystem engineers. In this long-term study we evaluated the effects of beavers on water chemistry in small boreal lakes of Southern Finland. We addressed the following three questions; does water chemistry differ between beaver and non-beaver lakes; does water chemis ...
DOI:
10.1007/s10533-015-0105-4

48. Spatiotemporal variations in carbon dynamics during a low flow period in a carbonate karst watershed: Santa Fe River, Florida, USA

Author:
Jin Jin; Andrew R. Zimmerman; Jonathan B. Martin; Mitra B. Khadka
Source:
Biogeochemistry 2015 v.122 no.1 pp. 131-150
ISSN:
0168-2563
Subject:
temporal variation; mineralization; rivers; chlorides; karsts; aquifers; base flow; sodium; carbonate minerals; dissolved organic carbon; riparian areas; biogeochemistry; soil water; spatial variation; groundwater; watershed hydrology; statistical models; watersheds; Florida
Abstract:
... To understand role of biogeochemical reactions in controlling the amount and molecular form of dissolved carbon exported from carbonate terrains, spatiotemporal variations in dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) were observed over one year in the Santa Fe River system, a period of base flow or below. A water mixing model developed using concentrations of Na⁺, Cl⁻, an ...
DOI:
10.1007/s10533-014-0035-6

49. Aquatic DOC export from subarctic Atlantic blanket bog in Norway is controlled by seasalt deposition, temperature and precipitation

Author:
Heleen A. de Wit; José L. J. Ledesma; Martyn N. Futter
Source:
Biogeochemistry 2016 v.127 no.2-3 pp. 305-321
ISSN:
0168-2563
Subject:
carbon dioxide; monitoring; sorption; models; peatlands; methane; accounting; watersheds; dissolved organic carbon; model uncertainty; summer; biogeochemistry; temperature; hydrochemistry; runoff; climate; Norway
Abstract:
... Comprehensive and credible peatland carbon budgets, needed for global carbon accounting, must include lateral aquatic organic carbon export. Here, we quantify aquatic dissolved organic carbon (DOC) export for an Atlantic bog in subarctic Norway, the Andøya peatland, and test for sensitivity to climatic drivers. Hydrology, DOC concentrations and DOC export were simulated for 2000–2013 using the pro ...
DOI:
10.1007/s10533-016-0182-z

50. Climate change effects on peatland decomposition and porewater dissolved organic carbon biogeochemistry

Author:
Catherine M. Dieleman; Zoë Lindo; James W. McLaughlin; Aaron E. Craig; Brian A. Branfireun
Source:
Biogeochemistry 2016 v.128 no.3 pp. 385-396
ISSN:
0168-2563
Subject:
peat; water quality; carbon dioxide enrichment; peatlands; climate change; dissolved organic carbon; ecosystems; biogeochemistry; temperature; climate; water table
Abstract:
... Carbon accumulation and storage is a defining characteristic of peatland ecosystems. Decomposition of peat releases dissolved organic carbon (DOC) to receiving waters and can be an important fraction of the peatland carbon budget, along with being an important modifier of downstream water quality. Changes in temperature and hydrological processes under future climate scenarios are expected to impa ...
DOI:
10.1007/s10533-016-0214-8

51. Dissolved organic carbon transformations and microbial community response to variations in recharge waters in a shallow carbonate aquifer

Author:
Katherine J. Cooper; Fiona F. Whitaker; Alexandre M. Anesio; Miranda Naish; Darren M. Reynolds; Emma L. Evans
Source:
Biogeochemistry 2016 v.129 no.1-2 pp. 215-234
ISSN:
0168-2563
Subject:
absorption; aquifers; bark; biogeochemistry; carbon dioxide; dissolved organic carbon; fluorescence; groundwater; lignin; metabolism; microbial activity; microbial communities; porosity; rain; respiratory rate; stemflow; throughfall; vegetation; water table
Abstract:
... In carbonate aquifers, dissolved organic carbon from the surface drives heterotrophic metabolism, generating CO₂ in the subsurface. Although this has been a proposed mechanism for enhanced dissolution at the water table, respiration rates and their controlling factors have not been widely evaluated. This study investigates the composition and concentration of dissolved organic carbon (DOC) reachin ...
DOI:
10.1007/s10533-016-0226-4

52. Drought and saltwater incursion synergistically reduce dissolved organic carbon export from coastal freshwater wetlands

Author:
Marcelo Ardón; Ashley M. Helton; Emily S. Bernhardt
Source:
Biogeochemistry 2016 v.127 no.2-3 pp. 411-426
ISSN:
0168-2563
Subject:
additive effect; biogeochemistry; coastal plains; dissolved organic carbon; drainage; drainage systems; drought; drying; ecosystems; estuaries; freshwater; landscapes; lowland forests; saline water; salinity; sea level; seawater; soil; storms; sulfates; summer; surface water; wetlands; North Carolina
Abstract:
... The hydrologic transport of dissolved organic carbon (DOC) represents both a primary energetic loss from and a critical energetic link between ecosystems. Coastal freshwater wetlands serve as a primary source of DOC to estuaries; historically the magnitude and timing of DOC transfers has been driven by water movement. Extensive agricultural development throughout the coastal plain of the southeast ...
DOI:
10.1007/s10533-016-0189-5

53. Extreme weather years drive episodic changes in lake chemistry: implications for recovery from sulfate deposition and long-term trends in dissolved organic carbon

Author:
Kristin E. Strock; Jasmine E. Saros; Sarah J. Nelson; Sean D. Birkel; Jeffrey S. Kahl; William H. McDowell
Source:
Biogeochemistry 2016 v.127 no.2-3 pp. 353-365
ISSN:
0168-2563
Subject:
acidification; biogeochemistry; climate; dissolved organic carbon; drought; hydrochemistry; lakes; landscapes; meteorological data; sulfates; surface water; temporal variation; watersheds; wetlands; Northeastern United States
Abstract:
... Interannual climate variability is expected to increase over the next century, but the extent to which hydroclimatic variability influences biogeochemical processes is unclear. To determine the effects of extreme weather on surface water chemistry, a 30-year record of surface water geochemistry for 84 lakes in the northeastern U.S. was combined with landscape data and watershed-specific weather da ...
DOI:
10.1007/s10533-016-0185-9

54. Rapid fine root C and N mineralization in a northern temperate forest soil

Author:
F. Santos; K. Nadelhoffer; J. A. Bird
Source:
Biogeochemistry 2016 v.128 no.1-2 pp. 187-200
ISSN:
0168-2563
Subject:
carbon dioxide; mineralization; boreal forests; Acer rubrum; nitrogen; temperate forests; fine roots; carbon nitrogen ratio; dissolved organic carbon; forest soils; earthworms; biogeochemistry; stable isotopes; coarse-textured soils; Michigan
Abstract:
... While fine roots (≤2-mm diameter) are major suppliers of carbon (C) and nitrogen (N) to northern temperate and boreal forest soils, our understanding of how long-term plant and N inputs affect fine root decomposition rates and the amount of root-derived organic matter (OM) stabilized in forest soils is incomplete. We examined the influence of long-term aboveground and/or belowground litter and ino ...
DOI:
10.1007/s10533-016-0202-z

55. Compositional changes and molecular transformations of dissolved organic matter during the arctic spring floods in the lower Churchill watershed (Northern Manitoba, Canada)

Author:
V. Mangal; Y. X. Shi; C. Guéguen
Source:
Biogeochemistry 2017 v.136 no.2 pp. 151-165
ISSN:
0168-2563
Subject:
absorbance; analysis of variance; biogeochemistry; dissolved organic carbon; ethylene; factor analysis; floods; fluorescence; humic substances; lignin; lipids; mass spectrometry; molecular weight; principal component analysis; proteins; rivers; spring; stream flow; watersheds; Arctic region; Manitoba
Abstract:
... The spring flood season in Northern aquatic systems is characterized by rapid changes in river discharge and fluxes of organic and inorganic species, yet remains under sampled. In this study, we examine the molecular characteristics and transformations of dissolved organic matter (DOM) during the Arctic spring season at three locations in the lower Churchill River watershed. Characteristics includ ...
DOI:
10.1007/s10533-017-0388-8

56. Dissolved organic matter retention in volcanic soils with contrasting mineralogy: a column sorption experiment

Author:
Jonathan Sanderman; Marc G. Kramer
Source:
Biogeochemistry 2017 v.135 no.3 pp. 293-306
ISSN:
0168-2563
Subject:
chronosequences; correlation; nuclear magnetic resonance spectroscopy; volcanic soils; mineral soils; soil organic matter; sorption; soil properties; leaching; soil horizons; metals; minerals; dissolved organic carbon; aromatic acids; biogeochemistry; mineral content; Hawaii
Abstract:
... There is an increasing recognition that sorption and precipitation reactions between the dissolved phase of organic matter and reactive minerals and metals found in soils are an important carbon stabilization mechanism. We explored the relative importance of this sorption mechanism with pedological shifts in soil properties by conducting a dissolved organic matter leaching/sorption experiment usin ...
DOI:
10.1007/s10533-017-0374-1
CHORUS:
10.1007/s10533-017-0374-1

57. Extreme flooding mobilized dissolved organic matter from coastal forested wetlands

Author:
Hamed Majidzadeh; Habibullah Uzun; Alexander Ruecker; David Miller; Jeffery Vernon; Hongyuan Zhang; Shaowu Bao; Martin T. K. Tsui; Tanju Karanfil; Alex T. Chow
Source:
Biogeochemistry 2017 v.136 no.3 pp. 293-309
ISSN:
0168-2563
Subject:
temporal variation; dissolved organic nitrogen; basins; wetlands; rivers; subsurface flow; humic substances; hydrograph; flooded conditions; watersheds; rain; dissolved organic carbon; riparian areas; hurricanes; biogeochemistry; lowland forests; land use; runoff; Southeastern United States
Abstract:
... Two intense rainfalls [Hurricane Joaquin (2015) and Hurricane Matthew (2016)], one year apart, provided a unique opportunity to examine changes in dissolved organic matter (DOM) dynamics in coastal blackwater rivers under extreme flooding conditions in the southeastern United States. Two sites along Waccamaw River (a coastal blackwater river) and the outflow of 18 sub-basins of Yadkin-Pee Dee Basi ...
DOI:
10.1007/s10533-017-0394-x

58. Irrigation as a fuel pump to freshwater ecosystems

Author:
Sandrine J. Matiasek; Brian A. Pellerin; Robert G. M. Spencer; Brian A. Bergamaschi; Peter J. Hernes
Source:
Biogeochemistry 2017 v.136 no.1 pp. 71-90
ISSN:
0168-2563
Subject:
absorbance; biogeochemistry; dissolved organic carbon; dissolved organic nitrogen; energy; freshwater ecosystems; fuels; hydrology; irrigated farming; irrigation; nonprotein amino acids; seasonal variation; storms; streams; summer; time series analysis; ultraviolet-visible spectroscopy; watersheds; California
Abstract:
... We generated a detailed time series of total dissolved hydrolyzable amino acids (DHAA) in a watershed dominated by irrigated agriculture in northern California, USA to investigate the roles of hydrologic and seasonal changes on the composition of dissolved organic matter (DOM). DHAA are sensitive indicators of the degradation state and reactivity of DOM. DHAA concentrations ranged from 0.55 to 9.9 ...
DOI:
10.1007/s10533-017-0381-2

59. Recovery from acidification alters concentrations and fluxes of solutes from Czech catchments

Author:
Filip Oulehle; Tomáš Chuman; Jakub Hruška; Pavel Krám; William H. McDowell; Oldřich Myška; Tomáš Navrátil; Miroslav Tesař
Source:
Biogeochemistry 2017 v.132 no.3 pp. 251-272
ISSN:
0168-2563
Subject:
dissolved organic nitrogen; acidity; dissolved inorganic nitrogen; cations; dissolved organic carbon; phosphorus; sulfur; chemical bases; sulfates; forested watersheds; solutes; soil pH; runoff; acid deposition; biogeochemistry; hydrochemistry; adsorption; acidification; forest litter; streams; stoichiometry; nitrates
Abstract:
... Changes in atmospheric deposition, stream water chemistry, and solute fluxes were assessed across 15 small forested catchments. Dramatic changes in atmospheric deposition have occurred over the last three decades, including a 70% reduction in sulphur (S) deposition. These changes in atmospheric inputs have been associated with expected changes in levels of acidity, sulphate and base cations in str ...
DOI:
10.1007/s10533-017-0298-9
CHORUS:
10.1007/s10533-017-0298-9

60. Hydrologic and biogeochemical drivers of dissolved organic carbon and nitrate uptake in a headwater stream network

Author:
Erin Seybold; Brian McGlynn
Source:
Biogeochemistry 2018 v.138 no.1 pp. 23-48
ISSN:
0168-2563
Subject:
biocenosis; biogeochemistry; dissolved organic carbon; ecosystems; energy; landscapes; metabolism; nitrates; nutrient retention; nutrient uptake; nutrients; streams; water quality; watersheds
Abstract:
... Headwater streams are foci for nutrient and energy loading from terrestrial landscapes, in situ nutrient transformations, and downstream transport. Despite the prominent role that headwater streams can have in regulating downstream water quality, the relative importance of processes that can influence nutrient uptake have not been fully compared in heterotrophic aquatic systems. To address this re ...
DOI:
10.1007/s10533-018-0426-1
CHORUS:
10.1007/s10533-018-0426-1

61. Dissolved organic carbon production and flux under long-term litter manipulations in a Pacific Northwest old-growth forest

Author:
Lucas R. Evans; Derek Pierson; Kate Lajtha
Source:
Biogeochemistry 2020 v.149 no.1 pp. 75-86
ISSN:
0168-2563
Subject:
Pseudotsuga menziesii; biogeochemistry; coarse woody debris; dissolved organic carbon; groundwater; hydrologic models; lysimeters; old-growth forests; plant litter; soil organic carbon; soil profiles; soil solution; topography
Abstract:
... Dissolved organic carbon (DOC) flux is an important mechanism to convey soil carbon (C) from aboveground organic debris (litter) to deeper soil horizons and can influence the formation of stable soil organic C compounds. The magnitude of this flux depends on both infiltration and DOC production rates which are functions of the climatic, soil, topographic and ecological characteristics of a region. ...
DOI:
10.1007/s10533-020-00667-6

62. Dissolved organic matter composition and reactivity in Lake Victoria, the world’s largest tropical lake

Author:
Loris Deirmendjian; Thibault Lambert; Cedric Morana; Steven Bouillon; Jean-Pierre Descy; William Okello; Alberto V. Borges
Source:
Biogeochemistry 2020 v.150 no.1 pp. 61-83
ISSN:
0168-2563
Subject:
absorption; biogeochemistry; data collection; dissolved organic carbon; factor analysis; fluorescence; lakes; phytoplankton; rivers; runoff; stable isotopes; Eastern Africa; Lake Victoria
Abstract:
... We report a data set of dissolved organic carbon (DOC) concentration and dissolved organic matter (DOM) composition (stable carbon isotope signatures, absorption and fluorescence properties) obtained from samples collected in Lake Victoria, a large lake in East Africa. Samples were collected in 2018–2019 along a bathymetric gradient (bays to open waters), during three contrasting seasons: long rai ...
DOI:
10.1007/s10533-020-00687-2

63. Integrating atmospheric deposition-driven nutrients (N and P), microbial and biogeochemical processes in the watershed with carbon and nutrient export to the Ganga River

Author:
Ekabal Siddiqui; Jitendra Pandey; Usha Pandey; Vibha Mishra; Anand Vikram Singh
Source:
Biogeochemistry 2020 v.147 no.2 pp. 149-178
ISSN:
0168-2563
Subject:
agricultural land; atmospheric deposition; basins; beta-glucosidase; biogeochemistry; coastal ecosystems; deciduous forests; dissolved organic carbon; enzyme activity; grasslands; land use; microbial activity; microbial biomass; mixed forests; nutrients; pot culture; rivers; runoff; shrublands; soil; soil microorganisms; wastelands; water solubility; watersheds
Abstract:
... There has been considerable debate on how atmospheric deposition (AD) in the watershed alters the supply of dissolved organic carbon (DOC) to river and coastal ecosystems. Here we show how AD-N and –P in the Ganga River Basin (GRB) drives the delivery of DOC. We conducted three sets of studies, a 3 year (2016–2018) in situ trial, a 5 year (2014–2018) soil-spray experiment and a decadal-scale (2009 ...
DOI:
10.1007/s10533-019-00634-w

64. The role of the understory in litter DOC and nutrient leaching in boreal forests

Author:
Geert Hensgens; Hjalmar Laudon; Matthias Peichl; Itziar Aguinaga Gil; Quan Zhou; Martin Berggren
Source:
Biogeochemistry 2020 v.149 no.1 pp. 87-103
ISSN:
0168-2563
Subject:
Vaccinium myrtillus; bioavailability; biogeochemistry; canopy; coniferous forests; dissolved organic carbon; forest stands; interspecific variation; mosses and liverworts; net ecosystem exchange; nitrogen; phosphorus; plant litter; understory; wood
Abstract:
... Dissolved organic carbon (DOC) derived from plant litter plays an important role in the ecosystem carbon balance and soil biogeochemistry. However, in boreal coniferous forests no integrated understanding exists of how understory vegetation contributes to litter leaching of DOC, nitrogen (N) and phosphorus (P) with different bioavailability at the forest stand level. We characterized water extract ...
DOI:
10.1007/s10533-020-00668-5

65. Bioavailable DOC: reactive nutrient ratios control heterotrophic nutrient assimilation—An experimental proof of the macronutrient-access hypothesis

Author:
Daniel Graeber; Youngdoung Tenzin; Marc Stutter; Gabriele Weigelhofer; Tom Shatwell; Wolf von Tümpling; Jörg Tittel; Alexander Wachholz; Dietrich Borchardt
Source:
Biogeochemistry 2021 v.155 no.1 pp. 1-20
ISSN:
0168-2563
Subject:
ammonium nitrogen; bacterial biomass; bioavailability; biogeochemistry; dissolved organic carbon; dissolved organic nitrogen; fluorescent dyes; freshwater; heterotrophs; inoculum; leachates; leaves; nitrate nitrogen; nitrite nitrogen; nutrient uptake; reactive phosphorus; stoichiometry; streams; uncertainty
Abstract:
... We investigate the "macronutrient-access hypothesis", which states that the balance between stoichiometric macronutrient demand and accessible macronutrients controls nutrient assimilation by aquatic heterotrophs. Within this hypothesis, we consider bioavailable dissolved organic carbon (bDOC), reactive nitrogen (N) and reactive phosphorus (P) to be the macronutrients accessible to heterotrophic a ...
DOI:
10.1007/s10533-021-00809-4

66. Biogeochemical causes of sixty-year trends and seasonal variations of river water properties in a large European basin

Author:
Jiří Kopáček; Josef Hejzlar; Petr Porcal; Petr Znachor
Source:
Biogeochemistry 2021 v.154 no.1 pp. 81-98
ISSN:
0168-2563
Subject:
acid deposition; acidity; agricultural land; air pollution; algae; basins; biogeochemistry; calcium; carbon dioxide; chlorophyll; climate; dissolved organic carbon; eutrophication; laws and regulations; pH; phosphorus; river water; temperature profiles; wastewater; wastewater treatment; water temperature; Czech Republic
Abstract:
... We evaluated long-term trends and seasonal variations in the major physical–chemical properties of the circum-neutral Slapy reservoir (Vltava, Czech Republic) from 1960 to 2019. Mean annual water temperature increased by 2.1 °C, flow maxima shifted by ~ 13 days from the early April to mid-March, and the onset of thermal stratification of water column and spring algal peaks advanced by 19 and 21 da ...
DOI:
10.1007/s10533-021-00800-z

67. Bark controls tree branch-leached dissolved organic matter production and bioavailability in a subtropical forest

Author:
Jia-Wen Xu; Na Yang; Fu-Xi Shi; Yun Zhang; Songze Wan; Rong Mao
Source:
Biogeochemistry 2022 v.158 no.3 pp. 345-355
ISSN:
0168-2563
Subject:
bark; bioavailability; biogeochemistry; broadleaved trees; debarking; dissolved organic carbon; total nitrogen; total phosphorus; tropical forests; China
Abstract:
... Bark is an essential component of tree branches, yet its role in controlling branch-leached dissolved organic matter (DOM) characteristics remains unknown in forests. Here, we collected branches (about 1.5 cm in diameter) of two evergreen coniferous trees, two deciduous broadleaf trees, and three evergreen broadleaf trees from a subtropical forest in southern China, and subsequently used a bark re ...
DOI:
10.1007/s10533-022-00902-2

68. Decomposition of carbon adsorbed on iron (III)-treated clays and their effect on the stability of soil organic carbon and external carbon inputs

Author:
Mengyang You; Xia Zhu-Barker; Timothy A. Doane; William R. Horwath
Source:
Biogeochemistry 2022 v.157 no.2 pp. 259-271
ISSN:
0168-2563
Subject:
Lolium; Luvisols; adsorption; biogeochemistry; carbon dioxide; clay; dissolved organic carbon; iron; kaolinite; mineralization; montmorillonite; plant residues; soil organic carbon
Abstract:
... The interaction of organic carbon (OC) with clay and metals stabilizes soil carbon (C), but the influence of specific clay-metal-OC assemblages (flocs) needs further evaluation. This study aimed to investigate the stability of flocs in soil as affected by external C inputs. Flocs representing OC-mineral soil fractions were synthesized using dissolved organic C (DOC) combined with kaolinite (1:1 la ...
DOI:
10.1007/s10533-021-00873-w

69. Small rain events during drought alter sediment dissolved organic carbon leaching and respiration in intermittent stream sediments

Author:
Laura E. Coulson; Gabriele Weigelhofer; Stephanie Gill; Thomas Hein; Christian Griebler; Jakob Schelker
Source:
Biogeochemistry 2022 v.159 no.2 pp. 159-178
ISSN:
0168-2563
Subject:
bacterial communities; biofilm; biogeochemistry; carbon dioxide; climate change; community structure; dissolved organic carbon; drought; enzyme activity; ephemeral streams; fluorescence; hyporheic zone; rain; risk; rivers; sediments; stream channels; stream flow; tryptophan; water content
Abstract:
... With climate change, streams and rivers are at increased risk of droughts and flow intermittency. The full implications of these conditions for fluvial carbon (C) processing and stream-atmosphere CO₂ emissions are not well understood. We performed a controlled drought experiment in outdoor hyporheic flumes. We simulated small rain events that increase sediment moisture content, but do not cause st ...
DOI:
10.1007/s10533-022-00919-7