Mathematical model of ammonium nitrogen transport with overland flow on a slope after polyacrylamide application

Abstract The nutrient loss caused by soil erosion is the main reason for soil degradation and environmental pollution, and polyacrylamide (PAM) as a common soil amendment has a great influence on runoff and erosion processes at the slope. In order to investigate the mechanism of nutrient transport w...

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Autores principales:	Chang Ao, Peiling Yang, Shumei Ren, Weimin Xing
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fcadce5703d747469d486f91f6be3a93
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spelling	oai:doaj.org-article:fcadce5703d747469d486f91f6be3a932021-12-02T15:08:01ZMathematical model of ammonium nitrogen transport with overland flow on a slope after polyacrylamide application10.1038/s41598-018-24819-92045-2322https://doaj.org/article/fcadce5703d747469d486f91f6be3a932018-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-24819-9https://doaj.org/toc/2045-2322Abstract The nutrient loss caused by soil erosion is the main reason for soil degradation and environmental pollution, and polyacrylamide (PAM) as a common soil amendment has a great influence on runoff and erosion processes at the slope. In order to investigate the mechanism of nutrient transport with runoff, a field experiment was conducted and a simple mathematical model was developed in this study. Four PAM application rates (0, 1, 2, and 4 g·m−2) and two rainfall intensities (50 and 80 mm·h−1) were applied in the field experiment. The results revealed that runoff rate of 2 g·m−2 PAM application treatments decreased by 5.3%-10.6% compared with the control groups, but it increased by10.9%-18.7% at 4 g·m−2 PAM application treatments. Polyacrylamide application reduced ammonium nitrogen concentrations of runoff by 10.0% to 44.3% relative to the control groups. The best performance with correlation coefficient (R 2) and Nash–Sutcliffe efficiency (NSE) showed that the ammonium transport with runoff could be well described by the proposed model. Furthermore, the model parameter of the depth of the mixing layer (hm) linearly increased with an increase in flow velocity, but exponentially decreased with an increase in PAM application rate.Chang AoPeiling YangShumei RenWeimin XingNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-10 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chang Ao Peiling Yang Shumei Ren Weimin Xing Mathematical model of ammonium nitrogen transport with overland flow on a slope after polyacrylamide application
description	Abstract The nutrient loss caused by soil erosion is the main reason for soil degradation and environmental pollution, and polyacrylamide (PAM) as a common soil amendment has a great influence on runoff and erosion processes at the slope. In order to investigate the mechanism of nutrient transport with runoff, a field experiment was conducted and a simple mathematical model was developed in this study. Four PAM application rates (0, 1, 2, and 4 g·m−2) and two rainfall intensities (50 and 80 mm·h−1) were applied in the field experiment. The results revealed that runoff rate of 2 g·m−2 PAM application treatments decreased by 5.3%-10.6% compared with the control groups, but it increased by10.9%-18.7% at 4 g·m−2 PAM application treatments. Polyacrylamide application reduced ammonium nitrogen concentrations of runoff by 10.0% to 44.3% relative to the control groups. The best performance with correlation coefficient (R 2) and Nash–Sutcliffe efficiency (NSE) showed that the ammonium transport with runoff could be well described by the proposed model. Furthermore, the model parameter of the depth of the mixing layer (hm) linearly increased with an increase in flow velocity, but exponentially decreased with an increase in PAM application rate.
format	article
author	Chang Ao Peiling Yang Shumei Ren Weimin Xing
author_facet	Chang Ao Peiling Yang Shumei Ren Weimin Xing
author_sort	Chang Ao
title	Mathematical model of ammonium nitrogen transport with overland flow on a slope after polyacrylamide application
title_short	Mathematical model of ammonium nitrogen transport with overland flow on a slope after polyacrylamide application
title_full	Mathematical model of ammonium nitrogen transport with overland flow on a slope after polyacrylamide application
title_fullStr	Mathematical model of ammonium nitrogen transport with overland flow on a slope after polyacrylamide application
title_full_unstemmed	Mathematical model of ammonium nitrogen transport with overland flow on a slope after polyacrylamide application
title_sort	mathematical model of ammonium nitrogen transport with overland flow on a slope after polyacrylamide application
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/fcadce5703d747469d486f91f6be3a93
work_keys_str_mv	AT changao mathematicalmodelofammoniumnitrogentransportwithoverlandflowonaslopeafterpolyacrylamideapplication AT peilingyang mathematicalmodelofammoniumnitrogentransportwithoverlandflowonaslopeafterpolyacrylamideapplication AT shumeiren mathematicalmodelofammoniumnitrogentransportwithoverlandflowonaslopeafterpolyacrylamideapplication AT weiminxing mathematicalmodelofammoniumnitrogentransportwithoverlandflowonaslopeafterpolyacrylamideapplication
_version_	1718388295631634432

Mathematical model of ammonium nitrogen transport with overland flow on a slope after polyacrylamide application

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