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River network alteration of C-N-P dynamics in a mesoscale agricultural catchment

文献类型：期刊论文

作者Casquin, Antoine3; Gu, Sen1,2; Dupas, Remi3; Petitjean, Patrice2; Gruau, Gerard2; Durand, Patrick3
刊名SCIENCE OF THE TOTAL ENVIRONMENT
出版日期2020-12-20
卷号749页码:14
关键词Carbon Nitrogen Phosphorus In-stream processes Stochastic modelling Catchment
ISSN号0048-9697
DOI10.1016/j.scitotenv.2020.141551
通讯作者Casquin, Antoine(antoine.casquin@inrae.fr) ; Gu, Sen(gusen@ihb.ac.cn)
英文摘要The majority of freshwater ecosystems worldwide suffer from eutrophication, particularly because of agriculture-derived nutrient sources. In the European Union, a discrepancy exists between the scale of regulatory assessment and the size of research catchments. The Water Framework Directive sets water quality objectives at the mesoscale (50-500 km(2)), a scale at which both hillslope and in-stream processes influence carbon (C), nitrogen (N) and phosphorus (P) dynamics. Conversely, research catchments focus on headwaters to investigate hillslope processes while minimising the influence of river processes on C-N-P dynamics. Because hillslope and river processes have common hydro-climatic drivers, the relative influence of each on C-N-P dynamics is difficult to disentangle at the mesoscale. In the present study, we used repeated synoptic sampling throughout the river network of a 300 km2 intensively farmed catchment, spatial stochastic modelling and mass balance calculations to analyse this mesoscale conundrum. The main objective was to quantify how river processes altered C-N-P hydrochemical dynamics in different flow, concentration and temperature conditions. Our results show that flow was the main control of alterations of C-N-P dynamics in the river network, while temperature and source concentration had little or no influence. The influence of river processes peaked during low flow, with up to 50% of dissolved organic carbon (DOC) production, up to 100% of nitrate (NO3) retention and up to 50% of total phosphorus (TP) retention. Despite high percentages of river processes at low flow, their influence on annual loads was low for NO3 (median of 10%) and DOC (median of +25%) but too variable to draw conclusions for TP. Because of the differing river alteration rates among carbon and nutrients, stoichiometric ratios varied greatly from headwaters to the outlet especially during the eutrophication-sensitive low-flow season. (C) 2020 Elsevier B.V. All rights reserved.
WOS关键词NUTRIENT REMOVAL ; WATER-QUALITY ; LAND-USE ; NITRATE ; STREAM ; PHOSPHORUS ; RETENTION ; NITROGEN ; FLUXES ; HYDROLOGY
资助项目Interreg project Channel Payments for Ecosystem Services ; European Regional Development Fund (ERDF)
WOS研究方向Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000581793800069
出版者ELSEVIER
资助机构Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; Interreg project Channel Payments for Ecosystem Services ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF) ; European Regional Development Fund (ERDF)
源URL[http://ir.ihb.ac.cn/handle/342005/39351]  
专题水生生物研究所_其他_期刊论文
通讯作者Casquin, Antoine; Gu, Sen
作者单位1.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
2.CNRS, OSUR, Geosci Rennes, UMR 6118, Campus Beaulieu, F-35042 Rennes, France
3.INRAE, Inst Agro, UMR 1069, SAS, F-35000 Rennes, France
推荐引用方式
GB/T 7714		 Casquin, Antoine,Gu, Sen,Dupas, Remi,et al. River network alteration of C-N-P dynamics in a mesoscale agricultural catchment[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,749:14.
APA Casquin, Antoine,Gu, Sen,Dupas, Remi,Petitjean, Patrice,Gruau, Gerard,&Durand, Patrick.(2020).River network alteration of C-N-P dynamics in a mesoscale agricultural catchment.SCIENCE OF THE TOTAL ENVIRONMENT,749,14.
MLA Casquin, Antoine,et al."River network alteration of C-N-P dynamics in a mesoscale agricultural catchment".SCIENCE OF THE TOTAL ENVIRONMENT 749(2020):14.

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来源：水生生物研究所

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