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You searched for: Journal name Biogeochemistry Remove constraint Journal name: Biogeochemistry Publication year rev 7988-2012 Remove constraint Publication year rev: 7988-2012 Source 2012 v.107 no.1-3 Remove constraint Source: 2012 v.107 no.1-3
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1. Alder cover drives nitrogen availability in Kenai lowland headwater streams, Alaska

Author:
Rebecca S. Shaftel; Ryan S. King; Jeffrey A. Back
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 135-148
ISSN:
0168-2563
Subject:
Alnus; Salmonidae; atmospheric precipitation; ecosystems; growing season; losses from soil; models; nitrate nitrogen; nitrates; nitrogen; nitrogen fixation; nitrogen oxides; nitrogen-fixing trees; nutrients; salmon; seasonal variation; spring; streams; temperature; topographic slope; vegetation cover; watersheds; Alaska
Abstract:
... Terrestrial sources of nitrogen (N), particularly N-fixing alder, may be important for sustaining production in headwater streams that typically lack substantial subsidies of marine-derived nutrients from spawning salmon yet support upstream-dispersing juvenile salmonids. However, other physiographic characteristics, such as watershed slope and topographic wetness, also control transport of nutrie ...
DOI:
10.1007/s10533-010-9541-3

2. Carbon balances in US croplands during the last two decades of the twentieth century

Author:
E. Lokupitiya; K. Paustian; M. Easter; S. Williams; O. Andrén; T. Kätterer
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 207-225
ISSN:
0168-2563
Subject:
agricultural land; atmospheric precipitation; carbon; carbon dioxide; carbon footprint; carbon sinks; crop residues; databases; greenhouse gas emissions; greenhouse gases; growing season; magnesium; models; primary productivity; soil heterogeneity; soil organic matter; soil respiration; spatial variation; temperature; temporal variation; United States
Abstract:
... Carbon (C) added to soil as organic matter in crop residues and carbon emitted to the atmosphere as CO₂ in soil respiration are key determinants of the C balance in cropland ecosystems. We used complete and comprehensive county-level yields and area data to estimate and analyze the spatial and temporal variability of regional and national scale residue C inputs, net primary productivity (NPP), a ...
DOI:
10.1007/s10533-010-9546-y

3. Carbon sink to source: longitudinal gradients of planktonic P:R ratios in subtropical reservoirs

Author:
Margaret G. Forbes; Robert D. Doyle; J. Thad Scott; Jacob K. Stanley; Hui Huang; Barry A. Fulton; Bryan W. Brooks
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 81-93
ISSN:
0168-2563
Subject:
biomass; carbon; carbon sinks; cell respiration; chlorophyll; heterotrophs; linear models; metabolism; plankton; sinks (equipment); summer; water reservoirs; Texas
Abstract:
... Spatial patterns of planktonic production and respiration in the surface mixed layer were examined in eight Texas, USA reservoirs to test the hypothesis that P:R ratios are lowest in upreservoir inflow zones and highest in downreservoir open-water zones, as predicted by the heuristic reservoir zonation model. We measured summer planktonic metabolism with light–dark bottles and physical–chemica ...
DOI:
10.1007/s10533-010-9533-3

4. Chemical characteristics of particulate organic matter from a small, mountainous river system in the Oregon Coast Range, USA

Author:
Jeff A. Hatten; Miguel A. Goñi; Robert A. Wheatcroft
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 43-66
ISSN:
0168-2563
Subject:
amino acids; biomarkers; carbon; cutin; floods; hardwood; landslides; mass transfer; mountains; nitrogen; organic matter; particulates; phenols; primary productivity; riparian areas; rivers; soil; vegetation; watersheds; California; Oregon
Abstract:
... To better understand the transfer of particulate organic matter (POM) by small mountainous river systems (SMRS) to the ocean, we measured the concentration and composition of suspended particles from the Alsea River, a SMRS in the Oregon Coast Range, over a wide range of discharges that included several floods. All particulate constituents measured, including organic carbon, nitrogen and biomarker ...
DOI:
10.1007/s10533-010-9529-z

5. Emerging understanding of the ecosystem silica filter

Author:
Eric Struyf; Daniel J. Conley
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 9-18
ISSN:
0168-2563
Subject:
biodiversity; coasts; hydrology; oceans; silica; silicates; silicon; soil profiles; terrestrial ecosystems; vegetation; weathering
Abstract:
... The annual fixation of dissolved Si (DSi) into terrestrial vegetation has been estimated to range from 60 to 200 Tmole, or 10–40 times more than the yearly export of DSi and biogenic Si (BSi) from the terrestrial geobiosphere to the coastal zone. Ecosystems form a large filter between primary mobilization of DSi from silicate weathering and its eventual export to the oceans, and a large reservoi ...
DOI:
10.1007/s10533-011-9590-2

6. Experimental simulation of the effects of extreme climatic events on major ions, acidity and dissolved organic carbon leaching from a forested catchment, Gårdsjön, Sweden

Author:
Filip Moldan; Jakub Hruška; Christopher D. Evans; Michael Hauhs
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 455-469
ISSN:
0168-2563
Subject:
acidification; acidity; adsorption; aluminum; cations; chlorine; climate change; coasts; correlation; desorption; dissolved organic carbon; forested watersheds; hydrochemistry; hydrogen; ionic strength; leaching; mineral soils; mixing; models; neutralization; nitrates; organic soils; pH; rain; runoff; solubility; streams; sulfates; summer; Sweden
Abstract:
... Climate change is predicted to lead to an increase in extreme rainfall and, in coastal areas, sea-salt deposition events. The impacts of these two climatic extremes on stream hydrochemistry were separately evaluated via a novel watering manipulation at the Gårdsjön experimental catchment, SW Sweden. In summer 2004, a 2000 m² hillslope draining to a defined stream reach was brought to a high-fl ...
DOI:
10.1007/s10533-010-9567-6

7. Fate of ammonium 15N in a Norway spruce forest under long-term reduction in atmospheric N deposition

Author:
Nicole Dörr; Klaus Kaiser; Leopold Sauheitl; Norbert Lamersdorf; C. Florian Stange; Georg Guggenberger
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 409-422
ISSN:
0168-2563
Subject:
Picea abies; amino acids; ammonium nitrogen; atmospheric deposition; biotransformation; conifer needles; degradation; drainage; environmental fate; forest ecosystems; forest soils; forests; gas emissions; groundwater; immobilization in soil; leaching; microbial biomass; nutrient uptake; plant litter; trees
Abstract:
... In the last decades, in particular forest ecosystems became increasingly N saturated due to elevated atmospheric N deposition, resulting from anthropogenic N emission. This led to serious consequences for the environment such as N leaching to the groundwater. Recent efforts to reduce N emissions raise the question if, and over what timescale, ecosystems recover to previous conditions. In order to ...
DOI:
10.1007/s10533-010-9561-z

8. Hydrogen peroxide production driven by UV-B in planktonic microorganisms: a photocatalytic factor in sea warming and ice melting in regions with ozone depletion?

Author:
Cosme M. Moreno
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 1-8
ISSN:
0168-2563
Subject:
antibodies; biogeochemistry; catalase; climate; cold; ecosystems; heat; hydrogen peroxide; ice; icebergs; latitude; melting; microorganisms; oceans; oxygen; ozone depletion; ozonosphere; photochemical reactions; plankton; synthesis; ultraviolet radiation
Abstract:
... UV-B radiation activates the synthesis of hydrogen peroxide from water and oxygen in many protein kinds, which having been discovered initially in antibodies, has been so far applied to explore new mechanisms in relation to immune defence. As shown here, the natural association of this common photocatalysis and catalase transforms UV-B photons into heat in a cyclic reaction that represents in biol ...
DOI:
10.1007/s10533-010-9566-7

9. Impacts of forest biomass removal on soil nutrient status under climate change: a catchment-based modelling study for Finland

Author:
Julian Aherne; Maximilian Posch; Martin Forsius; Aleksi Lehtonen; Kari Härkönen
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 471-488
ISSN:
0168-2563
Subject:
aboveground biomass; base saturation; branches; cations; climate; climate change; ecosystems; environmental impact; forest growth; forest inventory; forests; harvesting; hydrochemistry; lakes; logging; models; neutralization; nitrogen; potassium; roots; soil nutrients; soil quality; sustainable forestry; temporal variation; water quality; watersheds; weathering; Finland
Abstract:
... The environmental impact of different forest harvesting scenarios on soil nutrient status and water chemistry under current and future (IPCC A2) climate was evaluated for a random sample of lake catchments (n = 1066) covering Finland. Biomass removal scenarios were derived from a management-oriented large-scale forest model based on data from national forest inventories. Forest ecosystem sustain ...
DOI:
10.1007/s10533-010-9569-4

10. Is chloride a conservative ion in forest ecosystems?

Author:
Teresia Svensson; Gary M. Lovett; Gene E. Likens
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 125-134
ISSN:
0168-2563
Subject:
atmospheric deposition; biogeochemical cycles; chlorides; coasts; data collection; forest ecosystems; forest soils; forested watersheds; ions; vegetation
Abstract:
... Chloride (Cl⁻) has often been assumed to be relatively unreactive in forest ecosystems, and is frequently used as a conservative tracer to calculate fluxes of water and other ions. Recently, however, several studies have detailed cycling of Cl⁻ in vegetation and soils. In this study Cl⁻ budgets are compiled from 32 catchment studies to determine the extent to which Cl⁻ is conserved in the ...
DOI:
10.1007/s10533-010-9538-y

11. Long term nutrient loads and chlorophyll dynamics in a large temperate Australian lagoon system affected by recurring blooms of cyanobacteria

Author:
Perran L. M. Cook; Daryl P. Holland
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 261-274
ISSN:
0168-2563
Subject:
Nodularia spumigena; Synechococcus; chlorophyll; correlation; estuaries; floods; lakes; nitrates; nitrites; nitrogen; nitrogen content; phosphorus; pollution load; spring; summer; surface water; temperate zones; water salinity; watersheds; wildfires; winter; Australia; Baltic Sea
Abstract:
... While rare globally, blooms of the toxic cyanobacteria Nodularia spumigena are a recurring problem in a few estuaries, such as the Baltic Sea and several southern Australian estuaries. Here, we document recurring Nodularia spumigena Mertens blooms in the Gippsland Lakes, S.E. Australia; a temperate lagoon system with episodic, winter-spring dominated catchment inflows. Physico-chemical conditions ...
DOI:
10.1007/s10533-010-9551-1

12. Mercury–organic matter relationships in pre-pollution sediments of thermokarst lakes from the Mackenzie River Delta, Canada: the role of depositional environment

Author:
H. Sanei; P. M. Outridge; A. Dallimore; P. B. Hamilton
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 149-164
ISSN:
0168-2563
Subject:
macrophytes; sediments; river deltas; phytoplankton; lakes; mercury; organic matter; surface area; tundra soils; carbon; global warming; pollution; Bacillariophyta; Northwest Territories; Arctic region
Abstract:
... This study investigates the influence of organic matter (OM) on the historical variations of Hg in sediments from two closely-situated Canadian Arctic lakes, prior to the advent of Hg pollution inputs. Because of variable landscape evolution in the Mackenzie River Delta over the past 1–3 millennia, the lakes provide distinctly different histories of OM sources, types, and degree of aquatic produ ...
DOI:
10.1007/s10533-010-9543-1

13. Metal concentrations in urban riparian sediments along an urbanization gradient

Author:
Daniel J. Bain; Ian D. Yesilonis; Richard V. Pouyat
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 67-79
ISSN:
0168-2563
Subject:
calcium; cement; coastal plains; copper; drought; environmental impact; floods; geochemistry; lead; piedmont; riparian areas; sediment contamination; sediments; spatial variation; surveys; urban areas; urban soils; urbanization; zinc; Eastern United States
Abstract:
... Urbanization impacts fluvial systems via a combination of changes in sediment chemistry and basin hydrology. While chemical changes in urban soils have been well characterized, similar surveys of riparian sediments in urbanized areas are rare. Metal concentrations were measured in sediments collected from riparian areas across the urbanization gradient in Baltimore, MD. Average metal concentration ...
DOI:
10.1007/s10533-010-9532-4

14. N, P, Si budgets for the Red River Delta (northern Vietnam): how the delta affects river nutrient delivery to the sea

Author:
Thi Nguyet Minh Luu; Josette Garnier; Gilles Billen; Thi Phuong Quynh Le; Julien Nemery; Didier Orange; Lan Anh Le
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 241-259
ISSN:
0168-2563
Subject:
anthropogenic activities; coasts; delta soils; drainage; eutrophication; industrialization; nitrogen; phosphorus; population growth; rivers; silica; silicon; watershed hydrology; watersheds; Vietnam
Abstract:
... The Red River Delta (RRD) (Vietnam), a region experiencing rapid population growth, industrialization, and economic development, concentrates 54% of the population of the whole Red River watershed in less than 10% of the basin area. Our study aimed at understanding and quantifying the processes by which the delta affects the nutrient fluxes coming from the upstream watershed before they reach the ...
DOI:
10.1007/s10533-010-9549-8

15. N2O and CH4 fluxes in undisturbed and burned holm oak, scots pine and pyrenean oak forests in central Spain

Author:
Rosa Inclán; Carla Uribe; Laura Sánchez; Dolores M. Sánchez; Ángeles Clavero; Ana María Fernández; Ramón Morante; Alfredo Blanco; Robert Jandl
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 19-41
ISSN:
0168-2563
Subject:
Pinus sylvestris; Quercus ilex; Quercus pyrenaica; climatic factors; dry season; forest fires; forest soils; forests; gas emissions; methane; methane production; nitrogen; nitrous oxide; nutrient availability; oxidation; rain; seasonal variation; soil fertility; soil organic carbon; soil temperature; soil water; soil water content; spring; water content; Spain
Abstract:
... We investigated N₂O and CH₄ fluxes from soils of Quercus ilex, Quercus pyrenaica and Pinus sylvestris stands located in the surrounding area of Madrid (Spain). The fluxes were measured for 18 months from both mature stands and post fire stands using the static chamber technique. Simultaneously with gas fluxes, soil temperature, soil water content, soil C and soil N were measured in the stands ...
DOI:
10.1007/s10533-010-9520-8

16. Nutrient export to an Eastern Atlantic coastal zone: first modeling and nitrogen mass balance

Author:
Mathieu Canton; Pierre Anschutz; Alexandra Coynel; Pierre Polsenaere; Isabelle Auby; Dominique Poirier
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 361-377
ISSN:
0168-2563
Subject:
dissolved organic nitrogen; Pinus; trees; phosphorus; land use; ammonium nitrogen; biogeochemical cycles; agricultural watersheds; nitrogen fixation; photographs; fertilizer application; forested watersheds; coniferous forests; nitrate nitrogen; losses from soil; hydrology; coasts; ecosystems; harvesting; Zea mays; models; corn; soil; nonpoint source pollution; nitrogen fertilizers; rivers; geographic information systems; forest plantations; nitrates; France
Abstract:
... We have studied 15 catchments supplying freshwater to a French Atlantic coastal lagoon, where increase in nitrogen loads due to agriculture is supposed to have destabilized the ecosystem in the last decades. The catchment is a lowland composed of Pleistocene sands with an average slope of 0.25%. To study the nutrient export in relation to land-use surface waters were sampled bi-weekly between Octo ...
DOI:
10.1007/s10533-010-9558-7

17. Plant–microbe interactions and nitrogen dynamics during wetland establishment in a desert stream

Author:
James B. Heffernan; Stuart G. Fisher
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 379-391
ISSN:
0168-2563
Subject:
biomass; carbon; colonizing ability; correlation; denitrification; deserts; ecosystems; greenhouses; herbaceous plants; microbial growth; microorganisms; nitrates; nitrogen; nitrogen content; nutrient retention; nutrient uptake; primary succession; root shoot ratio; stream channels; surveys; vegetation; wetlands
Abstract:
... In late-successional steady state ecosystems, plants and microbes compete for nutrients and nutrient retention efficiency is expected to decline when inputs exceed biotic demand. In carbon (C)-poor environments typical of early primary succession, nitrogen (N) uptake by C-limited microbes may be limited by inputs of detritus and exudates derived from contemporaneous plant production. If plants are ...
DOI:
10.1007/s10533-010-9559-6

18. Response of carbon fluxes to the 2003 heat wave and drought in three mature forests in Switzerland

Author:
Elisabeth Graf Pannatier; Matthias Dobbertin; Alexander Heim; Maria Schmitt; Anne Thimonier; Peter Waldner; Beat Frey
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 295-317
ISSN:
0168-2563
Subject:
tree growth; carbon dioxide; soil organic carbon; soil water content; stems; heat; drought; trees; carbon sinks; carbon sequestration; dissolved organic carbon; net ecosystem production; soil matric potential; soil respiration; summer; forests; Switzerland
Abstract:
... The effects of the heat and drought of the summer 2003 on carbon (C) fluxes (soil CO₂ efflux, dissolved organic carbon in soil, C from litterfall and C sequestration in tree) were investigated in three mature forests in Switzerland between 2001 and 2005. Measurements of the soil matric potential (Ψ) indicated a gradient in drought intensity at the three sites (Vordemwald, Schänis, Beatenberg) ...
DOI:
10.1007/s10533-010-9554-y

19. Southeastern U.S.A. continental shelf respiratory rates revisited

Author:
Joan E. Sheldon; Peter C. Griffith; Francesc Peters; Wade M. Sheldon Jr.; Jackson O. Blanton; Julie Amft; Lawrence R. Pomeroy
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 501-506
ISSN:
0168-2563
Subject:
accuracy; analytical methods; carbon; continental shelf; data analysis; ecosystem respiration; geographical variation; marine environment; space and time; Southeastern United States
Abstract:
... Respiratory rates on the U. S. southeastern continental shelf have been estimated several times by different investigators, most recently by Jiang et al. (Biogeochemistry 98:101–113, 2010) who report lower mean rates than were found in earlier work and attribute the differences to analytical error in all methods used in earlier studies. The differences are, instead, attributable to the differenc ...
DOI:
10.1007/s10533-010-9552-0

20. Spatial heterogeneity of understory vegetation and soil in an Alaskan upland boreal forest fire chronosequence

Author:
M. Lavoie; M. C. Mack
Source:
Biogeochemistry 2012 v.107 no.1-3 pp. 227-239
ISSN:
0168-2563
Subject:
boreal forests; burning; carbon; chronosequences; forest fires; forest litter; forest soils; lichens; microbial biomass; mineral soils; mineralization; mosses and liverworts; nitrogen; organic horizons; soil heterogeneity; soil microorganisms; soil pH; soil profiles; soil respiration; soil water; understory; vegetation cover; Alaska
Abstract:
... In this study we characterized spatial heterogeneity of soil carbon and nitrogen pools, soil moisture, and soil pH of the first 15 cm of the soil profile; depth of the organic horizon; forest floor covers; and understory vegetation abundances in three sites (1999, 1987 and 1920 wildfires) of a boreal forest chronosequence of interior Alaska. We also investigated the cross-dependence between under ...
DOI:
10.1007/s10533-010-9547-x