Identifying nitrogen source and transport characteristics of the urban estuaries and gate-controlled rivers in northern Taihu Lake, China

Revealing nitrogen source and transport mechanisms are essential to achieving optimal nitrogen management in urban estuaries and gate-controlled rivers. However, in plains river networks, gate and/or dam construction make the nitrogen sources difficult to trace. In this study, seasonal water samples...

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Autores principales:	Xi Chen, Ling Jiang, Xiaoli Huang, Zucong Cai
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Taihu Lake Gate-controlled river Urban estuary Dual isotope Source apportionment Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/543cce23a3784485bfa6744b1ad69518
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spelling	oai:doaj.org-article:543cce23a3784485bfa6744b1ad695182021-12-01T04:58:19ZIdentifying nitrogen source and transport characteristics of the urban estuaries and gate-controlled rivers in northern Taihu Lake, China1470-160X10.1016/j.ecolind.2021.108035https://doaj.org/article/543cce23a3784485bfa6744b1ad695182021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21007007https://doaj.org/toc/1470-160XRevealing nitrogen source and transport mechanisms are essential to achieving optimal nitrogen management in urban estuaries and gate-controlled rivers. However, in plains river networks, gate and/or dam construction make the nitrogen sources difficult to trace. In this study, seasonal water samples from typical urban estuaries and gate-controlled rivers in northern Taihu Lake were analyzed using statistical analysis and stable isotope analysis in R (SIAR). The results show that the concentrations of various nitrogen forms showed obvious spatial–temporal distribution characteristics by multiple sources. Specifically, the nitrogen concentration was lower during the wet season than the dry season (T = 6.02, p < 0.01). Gate construction had a dual effect on the water environment, because it changed both the nitrogen transport processes and the nitrogen enrichment risk between the river side and lake side. The δ18O-NO3- and δ15N-NO3- values were sensitive to anthropogenic activity intensity and urbanization process, showing the following order of δ15N-NO3- values: Countryside > Suburbs > Downtown, and Construction Land > Forest-grassland > Farmland. While, a contrary trend was observed among the variations in δ18O-NO3- values. According to the SIAR model, sewage/manure, fertilizer, and sediment nitrogen (sediment N) were the main nitrate sources, accounting for 42.68%, 23.79%, and 23.71%, respectively. The proportion of urban nitrogen discharge has surpassed that of agricultural sources, becoming the largest nitrogen source in the waterbody. Under the coupling of meteorological conditions and estuary shape, the endogenous nitrogen released from sediment became the second largest contributor in some estuaries. These findings suggest that it is necessary to strengthen the control of urban exogenous nitrogen input and sediment nitrogen endogenous release to enable future estuarine nitrogen management and habitat restoration.Xi ChenLing JiangXiaoli HuangZucong CaiElsevierarticleTaihu LakeGate-controlled riverUrban estuaryDual isotopeSource apportionmentEcologyQH540-549.5ENEcological Indicators, Vol 130, Iss , Pp 108035- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Taihu Lake Gate-controlled river Urban estuary Dual isotope Source apportionment Ecology QH540-549.5
spellingShingle	Taihu Lake Gate-controlled river Urban estuary Dual isotope Source apportionment Ecology QH540-549.5 Xi Chen Ling Jiang Xiaoli Huang Zucong Cai Identifying nitrogen source and transport characteristics of the urban estuaries and gate-controlled rivers in northern Taihu Lake, China
description	Revealing nitrogen source and transport mechanisms are essential to achieving optimal nitrogen management in urban estuaries and gate-controlled rivers. However, in plains river networks, gate and/or dam construction make the nitrogen sources difficult to trace. In this study, seasonal water samples from typical urban estuaries and gate-controlled rivers in northern Taihu Lake were analyzed using statistical analysis and stable isotope analysis in R (SIAR). The results show that the concentrations of various nitrogen forms showed obvious spatial–temporal distribution characteristics by multiple sources. Specifically, the nitrogen concentration was lower during the wet season than the dry season (T = 6.02, p < 0.01). Gate construction had a dual effect on the water environment, because it changed both the nitrogen transport processes and the nitrogen enrichment risk between the river side and lake side. The δ18O-NO3- and δ15N-NO3- values were sensitive to anthropogenic activity intensity and urbanization process, showing the following order of δ15N-NO3- values: Countryside > Suburbs > Downtown, and Construction Land > Forest-grassland > Farmland. While, a contrary trend was observed among the variations in δ18O-NO3- values. According to the SIAR model, sewage/manure, fertilizer, and sediment nitrogen (sediment N) were the main nitrate sources, accounting for 42.68%, 23.79%, and 23.71%, respectively. The proportion of urban nitrogen discharge has surpassed that of agricultural sources, becoming the largest nitrogen source in the waterbody. Under the coupling of meteorological conditions and estuary shape, the endogenous nitrogen released from sediment became the second largest contributor in some estuaries. These findings suggest that it is necessary to strengthen the control of urban exogenous nitrogen input and sediment nitrogen endogenous release to enable future estuarine nitrogen management and habitat restoration.
format	article
author	Xi Chen Ling Jiang Xiaoli Huang Zucong Cai
author_facet	Xi Chen Ling Jiang Xiaoli Huang Zucong Cai
author_sort	Xi Chen
title	Identifying nitrogen source and transport characteristics of the urban estuaries and gate-controlled rivers in northern Taihu Lake, China
title_short	Identifying nitrogen source and transport characteristics of the urban estuaries and gate-controlled rivers in northern Taihu Lake, China
title_full	Identifying nitrogen source and transport characteristics of the urban estuaries and gate-controlled rivers in northern Taihu Lake, China
title_fullStr	Identifying nitrogen source and transport characteristics of the urban estuaries and gate-controlled rivers in northern Taihu Lake, China
title_full_unstemmed	Identifying nitrogen source and transport characteristics of the urban estuaries and gate-controlled rivers in northern Taihu Lake, China
title_sort	identifying nitrogen source and transport characteristics of the urban estuaries and gate-controlled rivers in northern taihu lake, china
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/543cce23a3784485bfa6744b1ad69518
work_keys_str_mv	AT xichen identifyingnitrogensourceandtransportcharacteristicsoftheurbanestuariesandgatecontrolledriversinnortherntaihulakechina AT lingjiang identifyingnitrogensourceandtransportcharacteristicsoftheurbanestuariesandgatecontrolledriversinnortherntaihulakechina AT xiaolihuang identifyingnitrogensourceandtransportcharacteristicsoftheurbanestuariesandgatecontrolledriversinnortherntaihulakechina AT zucongcai identifyingnitrogensourceandtransportcharacteristicsoftheurbanestuariesandgatecontrolledriversinnortherntaihulakechina
_version_	1718405660619571200

Identifying nitrogen source and transport characteristics of the urban estuaries and gate-controlled rivers in northern Taihu Lake, China

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