Effects of soil moisture content on upland nitrogen loss

Ouyang, Wei; Xu, Xueting; Hao, Zengchao; Gao, Xiang

doi:10.1016/j.jhydrol.2016.12.053

Cited by 47 publications

(18 citation statements)

References 45 publications

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“…Dynamic soil water flow controls these outcomes such that soil solution experiences less change per unit transport in rapid vs. slow flow paths. In addition, antecedent SWC controls infiltration rate that regulates the surface runoff (Defersha and Melesse, 2012;Ouyang et al, 2017).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Previous studies have reported that SWC (static) and subsurface flow (dynamic) have critical impacts on soil N transport and transformation (e.g., Zhu et al, 2012; ACCEPTED MANUSCRIPT Keiluweit et al, 2017;Ouyang et al, 2017). Yet, in process models and management decisions, impacts of dynamic and static soil water processes are usually simplified or substituted by some indirect parameters.…”

Section: Upscaling Soil Water-n Cycle Interactionsmentioning

confidence: 99%

“…For example, drainage class, irrigation, SWC, and water table have been used to interpret the soil N cycle and plant N availability (e.g., Sogbedji et al, 2000;Hefting et al, 2004;Schmidt et al, 2007;Poblador et al, 2017). When studying the N cycle from a hydrological perspective, controlling effects of soil water dynamics on the N cycle were usually investigated without digging into the underlying biological mechanism (e.g., Zhu et al, 2012Zhu et al, , 2015Ouyang et al, 2017;Zhang et al, 2018).…”

Section: Upscaling Soil Water-n Cycle Interactionsmentioning

confidence: 99%

“…the rainfall event scale, the dry antecedent SWC condition may increase the soil N mineralization and nitrification, which may in turn create a more abundant source of N for leaching (Goldberg and Gebauer, 2009;Castellano et al, 2013;Ouyang et al, 2017). Second, at the yearly scale, dry conditions may limit plant N uptake and result in more legacy N from previous N input (manure, fertilizer etc.)…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Coupling soil water processes and the nitrogen cycle across spatial scales: Potentials, bottlenecks and solutions

Zhu

Castellano

Gao

2018

Earth-Science Reviews

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Interactions among soil water processes and the nitrogen (N) cycle govern biological productivity and environmental outcomes in the earth's critical zone. Soil water influences the N cycle in two distinct but interactive modes. First, the spatio-temporal variation of soil water content (SWC) controls redox coupling among oxidized and reduced compounds, and thus N mineralization, nitrification, and denitrification. Secondly, subsurface flow controls the movement of water and dissolved N. These two processes interact such that subsurface flow dynamics control the occurrence of relatively static, isolated soil solution environments that span a range of reduced to oxidized conditions. However, the soil water-N cycle is usually treated as a black box. Models focused on N cycling simplify soil water parameters, while models focused on soil water processes simplify N cycling parameters. In addition, effective ways to deal with upscaling are lacking. New techniques will allow comprehensive coupling of the soil water-N cycle across time and space: 1) using hydrogeophysical tools to detect soil water processes and then linked to electrochemical N sensors to reveal the soil N cycle, (2) upscaling small-scale observations and simulations by constructing functions between soil water-N cycle and ancillary soil, topography and vegetation variables in the hydropedological functional units, and (3) integrating soil hydrology models with N cycling models to minimize the oversimplification of N biogeochemistry and soil hydrology mechanisms in these models. These suggestions will enhance our understanding of soil water processes and the N cycle and improve modeling of N losses as important sources of greenhouse gas emission and water pollution.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Upscaling Soil Water-n Cycle Interactionsmentioning

confidence: 99%

Section: Upscaling Soil Water-n Cycle Interactionsmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

See 2 more Smart Citations

Coupling soil water processes and the nitrogen cycle across spatial scales: Potentials, bottlenecks and solutions

Zhu

Castellano

Gao

2018

Earth-Science Reviews

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“…Understanding N, including ammonia nitrogen (NH4-N), nitrate nitrogen (NO3-N), and total nitrogen (TN) loss mechanisms, is essential for ecological sustainability and efficient agricultural production. Typically, processes of N losses are inextricably correlated with precipitation, soil properties and structures, and terrain factors (Kleinman et al, 2006;Ouyang et al, 2017;Tremblay et al, 2011). In sloping farmlands, N losses occur mainly by means of surface flow (SF), subsurface flow (SSF), and sediment (S) (Pionke et al, 1999;Zhao et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydrological Processes on Surface and Subsurface Nitrogen Losses from Purple Soil Slopes

Xie

Ping-cang²,

Shi

et al. 2021

Preprint

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Relationships of hydrological processes via surface flow (SF) and subsurface flow (SSF) to nitrogen (N) losses from sloping farmlands have been rarely researched. In this study, laboratory experiments were conducted to investigate ammonia nitrogen (NH4-N), nitrate nitrogen (NO3-N) and total nitrogen (TN) losses from purple sloped soils due to SF, SSF and sediment (S). Effects of rainfalls and slope gradients on N losses were also studied. Three rainfall intensities (0.4 ± 0.02, 1.0 ± 0.04 and 1.8 ± 0.11 mm min-1) and four slope gradients (5°, 10°, 15° and 20°) were designed in experiments. Larger SF discharges occurred with increasing rainfall intensities while SSF was prone to happen under low rainfall intensities. Although r2 of regression results were low, both N loss concentrations and loads coincided positively with discharges except for a negative relation between N concentrations and SF discharges. In comparison, smaller SSF discharges produced substantial N loads with higher N concentrations especially for NO3-N. NH4-N, NO3-N, and TN losses were dominated by S, SSF and SF, respectively. Furthermore, linear increases in loss loads with increasing discharges revealed that distributions of N loss loads were compatible with flow distributions in stormwater. 10° may be a critical slope gradient for SSF discharge and nutrient export.

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