Nitrogen removal in the Chaohu Lake, China: Implication in estimating lake N uptake velocity and modelling N removal efficiency of large lakes and reservoirs in the Changjiang River network

Lakes and reservoirs are important inland waterscapes in linking nitrogen (N) transport and removal from the terrestrial to marine ecosystems. N removal processes eliminate N permanently from lakes and reservoirs, including denitogen, permanent burial and biomass harvest. The N removal efficiency (R...

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Autores principales:	Qingqian Li, Qibiao Yu, Fang Wang, Weijin Yan, Jianing Wang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Denitrogen Nitrogen removal efficiency Uptake velocity Shallow eutrophic lake Reservoirs Changjiang River network Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/d23604161144477eaf5e82b068ca088f
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spelling	oai:doaj.org-article:d23604161144477eaf5e82b068ca088f2021-12-01T04:43:47ZNitrogen removal in the Chaohu Lake, China: Implication in estimating lake N uptake velocity and modelling N removal efficiency of large lakes and reservoirs in the Changjiang River network1470-160X10.1016/j.ecolind.2021.107353https://doaj.org/article/d23604161144477eaf5e82b068ca088f2021-05-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21000182https://doaj.org/toc/1470-160XLakes and reservoirs are important inland waterscapes in linking nitrogen (N) transport and removal from the terrestrial to marine ecosystems. N removal processes eliminate N permanently from lakes and reservoirs, including denitogen, permanent burial and biomass harvest. The N removal efficiency (R_removal, i.e. the fraction of N removal amount against total N loads to the lake) is an important parameter for the quantification of N removal from lakes and reservoirs. Intrinsically, R_removal depends on hydrologic load and total N uptake velocity (Vf_removal). However, it is a challenge in determining Vf_removal which can be used to model R_removal of lakes and reservoirs. Furthermore, there is less studies in distinguishing the N uptake velocity of individual processes from each other. Here, we estimated the magnitude of each uptake velocity of N removal processes with field observed data, and further presented an integrated Vf_removal to estimate R_removal of a typical eutrophic lake (the Chaohu Lake) in Eastern China. The mean dinitrogen emission rate was 1.23 ± 0.83 mg N m−2 h−1 in Chaohu Lake in 2016. The uptake velocity of denitrogen, permanent N burial and biomass harvest was 2.67 m yr−1, 0.25 m yr−1 and 0.23 m yr−1, respectively. The removal efficiency of denitrogen, permanent N burial and biomass harvest was 26.14%, 2.76% and 2.56%, respectively. The integrated value of Vf_removal was 3.33 m yr−1. We finally compiled hydrological data of 566 large reservoirs in Changjiang River network, and modelled the N removal by combining our estimated value of Vf_removal with hydrological data. We found a significant power relationship between N removal and the reservoir discharge, which can predict the variation of N removal of each reservoir in Changjiang River network. Our research helps to understand N removal in lakes and reservoirs at an entire river network scale.Qingqian LiQibiao YuFang WangWeijin YanJianing WangElsevierarticleDenitrogenNitrogen removal efficiencyUptake velocityShallow eutrophic lakeReservoirsChangjiang River networkEcologyQH540-549.5ENEcological Indicators, Vol 124, Iss , Pp 107353- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Denitrogen Nitrogen removal efficiency Uptake velocity Shallow eutrophic lake Reservoirs Changjiang River network Ecology QH540-549.5
spellingShingle	Denitrogen Nitrogen removal efficiency Uptake velocity Shallow eutrophic lake Reservoirs Changjiang River network Ecology QH540-549.5 Qingqian Li Qibiao Yu Fang Wang Weijin Yan Jianing Wang Nitrogen removal in the Chaohu Lake, China: Implication in estimating lake N uptake velocity and modelling N removal efficiency of large lakes and reservoirs in the Changjiang River network
description	Lakes and reservoirs are important inland waterscapes in linking nitrogen (N) transport and removal from the terrestrial to marine ecosystems. N removal processes eliminate N permanently from lakes and reservoirs, including denitogen, permanent burial and biomass harvest. The N removal efficiency (R_removal, i.e. the fraction of N removal amount against total N loads to the lake) is an important parameter for the quantification of N removal from lakes and reservoirs. Intrinsically, R_removal depends on hydrologic load and total N uptake velocity (Vf_removal). However, it is a challenge in determining Vf_removal which can be used to model R_removal of lakes and reservoirs. Furthermore, there is less studies in distinguishing the N uptake velocity of individual processes from each other. Here, we estimated the magnitude of each uptake velocity of N removal processes with field observed data, and further presented an integrated Vf_removal to estimate R_removal of a typical eutrophic lake (the Chaohu Lake) in Eastern China. The mean dinitrogen emission rate was 1.23 ± 0.83 mg N m−2 h−1 in Chaohu Lake in 2016. The uptake velocity of denitrogen, permanent N burial and biomass harvest was 2.67 m yr−1, 0.25 m yr−1 and 0.23 m yr−1, respectively. The removal efficiency of denitrogen, permanent N burial and biomass harvest was 26.14%, 2.76% and 2.56%, respectively. The integrated value of Vf_removal was 3.33 m yr−1. We finally compiled hydrological data of 566 large reservoirs in Changjiang River network, and modelled the N removal by combining our estimated value of Vf_removal with hydrological data. We found a significant power relationship between N removal and the reservoir discharge, which can predict the variation of N removal of each reservoir in Changjiang River network. Our research helps to understand N removal in lakes and reservoirs at an entire river network scale.
format	article
author	Qingqian Li Qibiao Yu Fang Wang Weijin Yan Jianing Wang
author_facet	Qingqian Li Qibiao Yu Fang Wang Weijin Yan Jianing Wang
author_sort	Qingqian Li
title	Nitrogen removal in the Chaohu Lake, China: Implication in estimating lake N uptake velocity and modelling N removal efficiency of large lakes and reservoirs in the Changjiang River network
title_short	Nitrogen removal in the Chaohu Lake, China: Implication in estimating lake N uptake velocity and modelling N removal efficiency of large lakes and reservoirs in the Changjiang River network
title_full	Nitrogen removal in the Chaohu Lake, China: Implication in estimating lake N uptake velocity and modelling N removal efficiency of large lakes and reservoirs in the Changjiang River network
title_fullStr	Nitrogen removal in the Chaohu Lake, China: Implication in estimating lake N uptake velocity and modelling N removal efficiency of large lakes and reservoirs in the Changjiang River network
title_full_unstemmed	Nitrogen removal in the Chaohu Lake, China: Implication in estimating lake N uptake velocity and modelling N removal efficiency of large lakes and reservoirs in the Changjiang River network
title_sort	nitrogen removal in the chaohu lake, china: implication in estimating lake n uptake velocity and modelling n removal efficiency of large lakes and reservoirs in the changjiang river network
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/d23604161144477eaf5e82b068ca088f
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Nitrogen removal in the Chaohu Lake, China: Implication in estimating lake N uptake velocity and modelling N removal efficiency of large lakes and reservoirs in the Changjiang River network

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