Baseflow contribution to nitrate-nitrogen export from a large, agricultural watershed, USA

Schilling, Keith E.; Zhang, You‐Kuan

doi:10.1016/j.jhydrol.2004.03.010

Cited by 190 publications

(189 citation statements)

References 27 publications

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“…ical and pedological characteristics of landscapes (Schilling and Zhang, 2004). Another important source for in-stream nitrate is direct nitrification of ammonium in the water column (Bernhardt et al, 2002).…”

Section: T Schuetz Et Al: Nitrate Sinks and Sources As Controls Ofmentioning

confidence: 99%

“…Local nitrate concentrations in streams and rivers depend largely on the following two antagonistic controls: nitrate export processes from landscapes to the stream network (e.g. Carpenter et al, 1998;Lam et al, 2012;Schilling and Zhang, 2004;Tesoriero et al, 2013) and instream removal processes (e.g. Bowes et al, 2014;Burgin and Hamilton, 2007;Covino et al, 2012;Hill, 1996;Montreuil et al, 2010;Mulholland et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Nitrate sinks and sources as controls of spatio-temporal water quality dynamics in an agricultural headwater catchment

Schuetz¹,

Gascuel‐Odoux²,

Durand³

et al. 2016

Hydrol. Earth Syst. Sci.

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Abstract. Several controls are known to affect water quality of stream networks during flow recession periods, such as solute leaching processes, surface water-groundwater interactions as well as biogeochemical in-stream turnover processes. Throughout the stream network, combinations of specific water and solute export rates and local in-stream conditions overlay the biogeochemical signals from upstream sections. Therefore, upstream sections can be considered functional units which could be distinguished and ordered regarding their relative contribution to nutrient dynamics at the catchment outlet. Based on snapshot sampling of flow and nitrate concentrations along the stream in an agricultural headwater during the summer flow recession period, we determined spatial and temporal patterns of water quality for the whole stream. A data-driven, in-stream-mixingand-removal model was developed and applied for analysing the spatio-temporal in-stream retention processes and their effect on the spatio-temporal fluxes of nitrate from subcatchments. Thereby, we have been able to distinguish quantitatively between nitrate sinks, sources per stream reaches, and subcatchments, and thus we could disentangle the overlay of nitrate sink and source signals. For nitrate sources, we determined their permanent and temporal impact on stream water quality and for nitrate sinks, we found increasing nitrate removal efficiencies from upstream to downstream. Our results highlight the importance of distinct nitrate source locations within the watershed for in-stream concentrations and in-stream removal processes, respectively. Thus, our findings contribute to the development of a more dynamic perception of water quality in streams and rivers concerning ecological and sustainable water resource management.

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Section: T Schuetz Et Al: Nitrate Sinks and Sources As Controls Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrate sinks and sources as controls of spatio-temporal water quality dynamics in an agricultural headwater catchment

Schuetz¹,

Gascuel‐Odoux²,

Durand³

et al. 2016

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…At present, water quality research in agricultural catchments focuses on transport of inorganic nitrogen forms from the surface -unsaturated zone -groundwater system to the streams (Thornton & Dise 1998;Haggard et al 2003;Schilling & Zhang 2004;Haraldsen & Stalnacke 2006.). The chemical composition of stream water is a function of the hydrobiogeochemical processes in the basin.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and indirect estimation of nitrate losses from the agricultural microbasin Rybárik

2007

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The long-term trends of mean monthly nitrate concentrations in stream and drainage runoff were evaluated in the experimental microbasin Rybárik (0.119 km 2 ) at the Institute of Hydrology, Slovak Academy of Sciences, during the period 1987-2005. The results of analyses indicate a decreasing trend of nitrate concentration after the year 1989, but with relatively high losses in some years and relatively low losses in other years. This decreasing trend is mainly caused by a decrease in the use of nitrogen fertilizers. The nitrate concentration in surface runoff strongly correlates with runoff and fertilization. Based on measured data, an empirical relation was found describing the dependence of annual nitrate transport in the stream on annual runoff depth and on the annual amount of applied nitrogen fertilizers.

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“…The loss of nitrates is not affected by rainfall variability as the sediment loss. According to some earlier studies, the base flow is the main source of nitrates at the surface of water bodies [59].…”

Section: Resultsmentioning

confidence: 99%

Vulnerability of Soil and Water in Mediterranean Agro-Forestry Systems

Duarte¹

2017

Mediterranean Identities - Environment, Society, Culture

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The study watershed is located within the Idanha Irrigation Scheme, Portugal. A hydrological and water quality station was installed at the outlet of the catchment. The AnnAGNPS model was applied in this study, and afterwards it was calibrated and validated to the conditions in the study catchment. The antecedent soil moisture conditions play an important role for rapid runoff and flash flooding. Relative Water Supply (RWS) is always bellow the unity value and sometimes below the value 0.5. Sometimes in very dry years, like the year 2004-2005 (302 mm), a runoff coefficient is equal to 0.40. Spatial distribution of runoff was primarily influenced by topography and soil management, which is common in Mediterranean agricultural systems, namely in grain crop systems such as oats and wheat. The simulation of spatial distribution of nitrate load shows a dependence of the spatial distribution of runoff, due to its high solubility. Spatial distribution of soil erosion by water indicates that the process does not depend directly on the runoff distribution in the catchment. Therefore, soil erosion is greatly influenced by deficient land cover whenever erosivity of rainfall is strong. Phosphorus losses were less than nitrate losses, due to their lower water solubility and mobility in soil.

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Baseflow contribution to nitrate-nitrogen export from a large, agricultural watershed, USA

Cited by 190 publications

References 27 publications

Nitrate sinks and sources as controls of spatio-temporal water quality dynamics in an agricultural headwater catchment

Nitrate sinks and sources as controls of spatio-temporal water quality dynamics in an agricultural headwater catchment

Evaluation and indirect estimation of nitrate losses from the agricultural microbasin Rybárik

Vulnerability of Soil and Water in Mediterranean Agro-Forestry Systems

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