PubAg

Main content area

You searched for: Subject "agricultural watersheds" Remove constraint Subject: "agricultural watersheds"
Start Over

Search

1,998  Search Results

« Previous | 1 - 20 of 1,998 |
Number of results to display per page

Search Results

1. Partitioning evapotranspiration using stable isotopes and Lagrangian dispersion analysis in a small agricultural catchment

Author:
Hogan, Patrick; Parajka, Juraj; Heng, Lee; Strauss, Peter; Blöschl, Günter
Source:
Journal of hydrology and hydromechanics 2020 v.68 no.2 pp. 134-143
ISSN:
1338-4333
Subject:
agricultural watersheds,   etc   ; canopy; corn; eddy covariance; evaporation; evapotranspiration; mathematical theory; stable isotopes; summer; transpiration; water vapor;     Show all 11 Subjects
Abstract:
... Measuring evaporation and transpiration at the field scale is complicated due to the heterogeneity of the environment, with point measurements requiring upscaling and field measurements such as eddy covariance measuring only the evapotranspiration. During the summer of 2014 an eddy covariance device was used to measure the evapotranspiration of a growing maize field at the HOAL catchment. The stab ...
DOI:
10.2478/johh-2020-0009

2. Modelling nutrient dynamics in cold agricultural catchments: A review

Author:
Costa, Diogo; Baulch, Helen; Elliott, Jane; Pomeroy, John; Wheater, Howard
Source:
Environmental modelling & software 2020 v.124 pp. 104586
ISSN:
1364-8152
Subject:
agricultural watersheds,   etc   ; agricultural land; biogeochemical cycles; cold zones; freezing; hydrology; models; prediction; spatial variation; temperature;     Show all 10 Subjects
Abstract:
... The hydrology of cold regions has been studied for decades with substantial progress in process understanding and prediction. Simultaneously, work on nutrient yields from agricultural land in cold regions has shown much slower progress. Advancement of nutrient modelling is constrained by well-documented issues of spatial heterogeneity, climate dependency, data limitations and over-parameterization ...
DOI:
10.1016/j.envsoft.2019.104586

3. Heavy metal accumulation, geochemical fractions, and loadings in two agricultural watersheds with distinct climate conditions

Author:
Liu, Lianhua; Ouyang, Wei; Wang, Yidi; Tysklind, Mats; Hao, Fanghua; Liu, Hongbin; Hao, Xin; Xu, Yixue; Lin, Chunye; Su, Liya
Source:
Journal of hazardous materials 2020 v.389 pp. 122125
ISSN:
0304-3894
Subject:
agricultural watersheds,   etc   ; anthropogenic activities; bioavailability; cadmium; climatic factors; copper; heavy metals; hydrologic models; lead; pollution; runoff; sediments; temperature;     Show all 13 Subjects
Abstract:
... The main aim of this study was to explore the effects of climate conditions on the transport and transformation of heavy metals. Sedimentary geochemical analysis and watershed modeling were used to investigate the distinctions between heavy metal pollution under different climate conditions. The results showed that the average concentrations of Cu, Cd, and Pb in sediments of the subtropical waters ...
DOI:
10.1016/j.jhazmat.2020.122125

4. Long-term surface water trends and relationship with open water evaporation losses in the Namoi catchment, Australia

Author:
Fuentes, Ignacio; van Ogtrop, Floris; Vervoort, R. Willem
Source:
Journal of hydrology 2020 v.584 pp. 124714
ISSN:
0022-1694
Subject:
agricultural watersheds,   etc   ; Landsat; climate change; climatic factors; data collection; evaporation; evapotranspiration; hydrologic cycle; rain; relative humidity; surface water; temperature; Australia;     Show all 13 Subjects
Abstract:
... Economic pressures on natural resources have led to a modification of natural surface water patterns. This has affected the hydrologic cycle at a global scale with multiple environmental and socioeconomic implications. This study evaluates long-term trends in surface water occurrence and related climate variables in a large agricultural catchment of Australia to understand trends in evaporative wa ...
DOI:
10.1016/j.jhydrol.2020.124714

5. Impact of P inputs on source-sink P dynamics of sediment along an agricultural ditch network

Author:
Ezzati, G.; Fenton, O.; Healy, M.G.; Christianson, L.; Feyereisen, G.W.; Thornton, S.; Chen, Q.; Fan, B.; Ding, J.; Daly, K.
Source:
Journal of environmental management 2020 v.257 pp. 109988
ISSN:
0301-4797
Subject:
agricultural watersheds,   etc   ; Mehlich-3 phosphorus; dairy farming; farms; reactive phosphorus; sediment-water interface; sediments; sorption; streams; total phosphorus; water quality;     Show all 11 Subjects
Abstract:
... Phosphorus (P) loss from intensive dairy farms is a pressure on water quality in agricultural catchments. At farm scale, P sources can enter in-field drains and open ditches, resulting in transfer along ditch networks and delivery into nearby streams. Open ditches could be a potential location for P mitigation if the right location was identified, depending on P sources entering the ditch and the ...
DOI:
10.1016/j.jenvman.2019.109988

6. Evaluation of groundwater recharge estimation methods in a watershed in the Brazilian Savannah

Author:
Cambraia Neto, Arnaldo José; Rodrigues, Lineu Neiva
Source:
Environmental earth sciences 2020 v.79 no.6 pp. 140
ISSN:
1866-6280
Subject:
agricultural watersheds,   etc   ; base flow; ecosystems; groundwater; groundwater recharge; irrigated farming; rain; rivers; water management; water table; Brazil;     Show all 11 Subjects
Abstract:
... The Brazilian Savannah Biome is strategic for Brazilian agriculture and for maintaining Brazil's hydrological balance, contributing to river flows from eight of the twelve Brazilian hydrographic regions. In recent years, there has been a continuous growth of irrigated agriculture, the main activity that uses the water resource, and the emergence of conflicts over water use. Thus, to improve water ...
DOI:
10.1007/s12665-020-8884-x

7. Total phosphorus export from Iowa agricultural watersheds: Quantifying the scope and scale of a regional condition

Author:
Schilling, Keith E.; Streeter, Matthew T.; Seeman, Anthony; Jones, Christopher S.; Wolter, Calvin F.
Source:
Journal of hydrology 2020 v.581 pp. 124397
ISSN:
0022-1694
Subject:
agricultural watersheds,   etc   ; agricultural land; anaerobic conditions; nitrate nitrogen; phosphorus; pollution load; rivers; surface water; total phosphorus; Gulf of Mexico; Iowa;     Show all 11 Subjects
Abstract:
... Total phosphorus (TP) export in rivers contributes to development of hypoxic conditions in receiving waterbodies and is typically sourced to agricultural nonpoint sources. Systematic quantification of TP loads and yields at a regional scale is not often reported but TP yields are known to vary considerably. In this study, TP yields from 46 Iowa watersheds were evaluated for the period from 2000 to ...
DOI:
10.1016/j.jhydrol.2019.124397

8. Stream loss in an urbanized and agricultural watershed in China

Author:
Han, Longfei; Xu, Youpeng; Deng, Xiaojun; Li, Zhongwu
Source:
Journal of environmental management 2020 v.253 pp. 109687
ISSN:
0301-4797
Subject:
agricultural watersheds,   etc   ; land use; laws and regulations; linear models; river deltas; rivers; streams; urban areas; urbanization; China; Yangtze River;     Show all 11 Subjects
Abstract:
... Stream losses are extensively observed due to human activities in the world, and the patterns of stream loss vary in different land use types. However, relationship between stream loss pattern and land use covers is poorly understood. We select the lower Taihu watershed (LTWS) within Yangtze River Delta (YRD), which is dominated by agricultural and urban covers and a typical case of most urbanized ...
DOI:
10.1016/j.jenvman.2019.109687

9. Transport Dynamics of Mercury in Rainfall-runoff After Summer Drought in a Small Agricultural Watershed in the Three Gorges Reservoir Region

Author:
Xu, Qinqin; Zhang, Cheng; Liang, Li; Wang, Dingyong; Zhao, Zheng; Wang, Ya; Wang, Yongmin
Source:
Bulletin of environmental contamination and toxicology 2019 v.102 no.5 pp. 679-685
ISSN:
0007-4861
Subject:
agricultural watersheds,   etc   ; drought; mercury; methylmercury compounds; monitoring; rain; runoff; summer;     Show all 8 Subjects
Abstract:
... The objective of this study was to investigate the transport dynamics of total mercury (THg) and methylmercury (MeHg) in the first rainfall-runoff event after summer drought, to understand flushing effects (FFEs) and to quantificationally estimate contributions to the annual outputs of Hg. The results showed that both THg and MeHg in rainfall-runoff predominated by particulate fraction peaked at t ...
DOI:
10.1007/s00128-019-02600-6

10. Quantifying denitrification following floodplain restoration via the two-stage ditch in an agricultural watershed

Author:
Speir, Shannon L.; Tank, Jennifer L.; Mahl, Ursula H.
Source:
Ecological engineering 2020 v.155 pp. 105945
ISSN:
0925-8574
Subject:
agricultural watersheds,   etc   ; alluvial soils; denitrification; detection limit; dredging; ecological function; ecosystem engineering; ecosystems; eutrophication; floodplains; mass spectrometry; nitrate nitrogen; nitrates; nitrogen; organic matter; sediments; streams; surface area; Indiana;     Show all 19 Subjects
Abstract:
... In agricultural streams, constructed floodplains have been shown to expand bioreactive surface area and enhance nitrate (NO₃⁻-N) removal via microbial denitrification, thereby reducing export to downstream ecosystems. At the Shatto Ditch Watershed (Indiana, USA), 0.6 km of two-stage ditch was constructed at the watershed outlet in 2007, while an additional 3.7 and 2.7 km were constructed in 2017 a ...
DOI:
10.1016/j.ecoleng.2020.105945

11. Delimitation of nutrient vulnerable zones - a comprehensive method to manage a persistent problem of agriculture

Author:
Orlińska-Woźniak, Paulina; Wilk, Paweł; Szalińska, Ewa
Source:
Agricultural systems 2020 v.183 pp. 102858
ISSN:
0308-521X
Subject:
agricultural watersheds,   etc   ; European Union; agricultural pollution; algorithms; aquatic environment; databases; eutrophication; models; nitrates; nitrogen; phosphorus; risk; rivers; surface water; water pollution; Poland;     Show all 16 Subjects
Abstract:
... Agriculture, despite numerous efforts, still remains the key pressure on the aquatic environment causing an over excessive enrichment with nitrogen and phosphorus compounds. Therefore, an essential part of contemporary research and management endeavours to identify areas at risk. Presented here is a method of delimitation of such zones susceptible to nutrient pollution from agricultural activities ...
DOI:
10.1016/j.agsy.2020.102858

12. Characterizing fast herbicide transport in a small agricultural catchment with conceptual models

Author:
Ammann, Lorenz; Doppler, Tobias; Stamm, Christian; Reichert, Peter; Fenicia, Fabrizio
Source:
Journal of hydrology 2020 v.586 pp. 124812
ISSN:
0022-1694
Subject:
agricultural watersheds,   etc   ; Bayesian theory; corn; herbicides; models; pollution; rain; risk factors; soil water; sorption; spray drift; stream flow; streams; uncertainty; Switzerland;     Show all 15 Subjects
Abstract:
... Herbicide pollution in headwater streams due to agricultural practices is a major environmental concern and is characterized by episodic peak concentrations from fast transport paths. We rely on previous experimental studies in a small (1.2km2) agricultural catchment in the Swiss Plateau, to model dynamic diffuse herbicide pollution with emphasis on fast transport paths in a conceptual modelling f ...
DOI:
10.1016/j.jhydrol.2020.124812

13. Nitrate dynamics in springs and headwater streams with agricultural catchments in southwestern Germany

Author:
Weber, Gero; Honecker, Ulrich; Kubiniok, Jochen
Source:
The Science of the total environment 2020 v.722 pp. 137858
ISSN:
0048-9697
Subject:
agricultural watersheds,   etc   ; arable soils; autumn; climate change; forested watersheds; nitrates; pollution load; rain; seasonal variation; specific ion electrodes; spring; streams; summer; surface water; winter; Germany;     Show all 16 Subjects
Abstract:
... The present study examined the dynamics of nitrate pollution in springs and headwater streams in agriculturally used watersheds. The objectives of the study were to record the pollution dynamics throughout the year as a function of different weather patterns and determine the correlation of these dynamics with the degree of agricultural use of the relevant catchments. Moreover, continuous measurin ...
DOI:
10.1016/j.scitotenv.2020.137858

14. Increase in farm size significantly accelerated stream channel erosion and associated nutrient losses from an intensive agricultural watershed

Author:
Li, Yong; Tang, Cheng; Huang, Zhigang; Hussain, Zahid; Are, Kayode Steven; Abegunrin, Toyin Peter; Qin, Zhaohua; Guo, Hao
Source:
Agriculture, ecosystems & environment 2020 v.295 pp. 106900
ISSN:
0167-8809
Subject:
agricultural watersheds,   etc   ; agricultural land; environmental impact; farm size; fertilizer application; fertilizers; grasses; soil erosion; stream channels; subtropics; total nitrogen; total phosphorus; China;     Show all 13 Subjects
Abstract:
... Increase in farm size (IFS) can reduce fertilizer use but it may accelerate soil erosion, particularly stream channel (SC) erosion and associated nutrient losses, due to reduced farmland heterogeneity. But these positive and negative environmental impacts of IFS have never been compared. The objectives of this study were to determine the SC erosion and associated nutrient losses following IFS, and ...
DOI:
10.1016/j.agee.2020.106900

15. Landscape pattern at the class level regulates the stream water nitrogen and phosphorus levels in a Chinese subtropical agricultural catchment

Author:
Liu, Ji; Liu, Xinliang; Wang, Yi; Li, Yong; Jiang, Yuexi; Wang, Meihui; Wu, Jinshui
Source:
Agriculture, ecosystems & environment 2020 v.295 pp. 106897
ISSN:
0167-8809
Subject:
agricultural watersheds,   etc   ; fractal dimensions; land use; landscapes; nitrogen; phosphorus; planning; pollution; ponds; regression analysis; rivers; stream flow; streams; tea; total nitrogen; total phosphorus; variance;     Show all 17 Subjects
Abstract:
... The landscape patch amount and configuration at the class level profoundly affect stream nitrogen (N) and phosphorus (P) concentrations in agricultural catchments, but their relationships and contributions to stream NP levels remain unclear. Here, we observed the stream water NP concentrations, stream flow, and landscape pattern at the class level in 11 catchments in a Chinese subtropical agricult ...
DOI:
10.1016/j.agee.2020.106897

16. Mapping depth to the argillic horizon on historically farmed soil currently under forests

Author:
Sutter, Lori; Ryland, Rachel C.; Thompson, Aaron; Sutter, Lori A.; Markewitz, Daniel
Source:
Geoderma 2020 v.369 pp. 114291
ISSN:
0016-7061
Subject:
agricultural watersheds,   etc   ; accelerated erosion; biogeochemistry; clay; clearcutting; erosion control; forests; geophysics; landscapes; piedmont; prediction; remote sensing; subsoil; subsurface flow; topographic slope; Southeastern United States;     Show all 16 Subjects
Abstract:
... The Piedmont region of the southeastern United States experienced a period of accelerated erosion in the 1800s. Clear-cutting of the forests coupled with soil tilling and inadequate erosion control practices led to substantial soil redistribution and loss. This redistribution exposed the subsoil clay (argillic) horizon in many locations and altered hydrologic processes (i.e., infiltration or inter ...
DOI:
10.1016/j.geoderma.2020.114291

17. Multiple stressors and stream macroinvertebrate community dynamics: Interactions between fine sediment grain size and flow velocity

Author:
Blöcher, Johanna R.; Ward, Matthew R.; Matthaei, Christoph D.; Piggott, Jeremy J.
Source:
The Science of the total environment 2020 v.717 pp. 137070
ISSN:
0048-9697
Subject:
agricultural watersheds,   etc   ; Chironomidae; Copepoda; agricultural development; aquatic invertebrates; benthic organisms; climate change; dams (hydrology); freshwater ecosystems; particle size; rivers; sand; silt; streams;     Show all 14 Subjects
Abstract:
... Agricultural development has resulted in the degradation of freshwater ecosystems worldwide. Two key stressors impacting streams and rivers draining agricultural catchments are deposited fine sediment (e.g. due to erosion) and reduced flows (e.g. due to water abstraction, dams, or climate change). Past studies have identified fine sediment as a ‘master stressor’ in streams, but the effects of diff ...
DOI:
10.1016/j.scitotenv.2020.137070

18. Fluxes of agricultural nitrogen and metolachlor metabolites are highly correlated in a first order stream in Maryland, USA

Author:
Rice, Clifford; Hively, W. Dean; McCarty, Gregory W.; Hapeman, Cathleen J.
Source:
The Science of the total environment 2020 v.716 pp. 136590
ISSN:
0048-9697
Subject:
agricultural watersheds,   etc   ; conservation practices; cropland; leaching; linear models; metabolites; metolachlor ethanesulfonic acid; metolachlor oxanilic acid; nitrate nitrogen; nitrogen; pollution; soil; streams; sulfonic acids; tracer techniques; vadose zone; Maryland;     Show all 17 Subjects
Abstract:
... Nitrogen pollution in watersheds containing significant cropland area is generally problematic. Conservation practices intended to reduce nitrate-N (NO₃⁻-N) export from watersheds are being implemented by many regions without necessary tools to assess effectiveness of abatement. A commonly used herbicide metolachlor degrades in the vadose zone of croplands to form two metabolites (metolachlor etha ...
DOI:
10.1016/j.scitotenv.2020.136590

19. Morphological and sedimentological responses of small stream channels to extreme rainfall and land use in the Darjeeling Himalayas

Author:
Prokop, Paweł; Wiejaczka, Łukasz; Sarkar, Subir; Bryndal, Tomasz; Bucała-Hrabia, Anna; Kroczak, Rafał; Soja, Roman; Płaczkowska, Eliza
Source:
Catena 2020 v.188 pp. 104444
ISSN:
0341-8162
Subject:
agricultural watersheds,   etc   ; base flow; bedrock; environmental factors; floods; forested watersheds; forests; land use change; mountains; piedmont; plantations; rain; rivers; sediments; soil; stream channels; tea; Himalayan region;     Show all 18 Subjects
Abstract:
... Three pairs of small, fourth- to sixth-order catchments (approximately 5–80 km²), draining the margin of the Darjeeling Himalayas into the piedmont, were selected for a comparison of the land-use impact on the morphology and sedimentology of their stream channels. Each pair experienced similar annual rainfall and comprised similar metamorphic bedrock, steep topography, and brown soils; the members ...
DOI:
10.1016/j.catena.2019.104444

20. Processes and mechanisms controlling nitrate dynamics in an artificially drained field: Insights from high-frequency water quality measurements

Author:
Liu, Wenlong; Youssef, Mohamed A.; Birgand, François P.; Chescheir, George M.; Tian, Shiying; Maxwell, Bryan M.
Source:
Agricultural water management 2020 v.232 pp. 106032
ISSN:
0378-3774
Subject:
agricultural watersheds,   etc   ; agricultural land; animal wastes; bioreactors; buffers; conservation practices; hysteresis; monitoring; nitrate nitrogen; nitrates; nitrogen; nutrient management; pollution load; soil; storms; subsurface drainage; water quality;     Show all 17 Subjects
Abstract:
... Intensive agricultural activities, especially in artificially drained agricultural landscapes, generate a considerable amount of nutrient export, which has been identified as a primary cause of water quality impairment. Several management practices have been developed and installed in agricultural watersheds to reduce nutrient export, e.g. nitrate-nitrogen (NO₃-N). Although published research repo ...
DOI:
10.1016/j.agwat.2020.106032