Temporal-spatial dynamics of anthropogenic nitrogen inputs and hotspots in a large river basin

doi:10.1016/j.chemosphere.2020.129411

	Temporal-spatial dynamics of anthropogenic nitrogen inputs and hotspots in a large river basin
	Cui, Meng 1,2; Guo, Qingjun 1,3; Wei, Rongfei 1; Chen, Ting 4,5
刊名	CHEMOSPHERE
	2021-04-01
卷号	269 页码:12
关键词	Anthropogenic nitrogen Environmental pressure Agricultural source Yangtze River Basin STIRPAT model
ISSN号	0045-6535
DOI	10.1016/j.chemosphere.2020.129411
通讯作者	Guo, Qingjun(guoqj@igsnrr.ac.cn)
英文摘要	Environmental pollution caused by human activities in the Yangtze River Basin (YRB), especially nitrogen pollution, has always been a hot topic. High-intensity anthropogenic nitrogen (AN) inputs have undergone some changes on account of environmental management practices in the YRB. We used the latest statistical data (2000-2017) to estimate spatiotemporal heterogeneity of AN inputs across the YRB, characterize hotspots of AN inputs, and predict the future trend, which is critical to meet nitrogen management challenges. We found agricultural sources were major contributors to nitrogen inputs (more than 70%) in the YRB. Due to the reduction in agricultural fertilizers use in China, AN inputs had gradually decreased from a peak of 19.0 Tg/yr in 2014 after a rapid growth period. Additionally, the nitrogen flux in sub-catchments and from various sources indicated an increasing distribution characteristic from the upper reaches to the lower reaches. Hotspots of AN inputs were mainly concentrated in the Sichuan Basin and the Middle-Lower Yangtze Plain (more than 50 tons/km(2)), however, growth rates were relatively low or even negative. STIRPAT model showed population size was the most important factor affecting AN loads. Although the growth rate would slow down in the future, AN loads would be maintained at a high level. Besides, aquaculture had become an important source of potential nitrogen growth in the whole basin, although the contribution was relatively small at present. Controlling nitrogen loads in hotspots and avoiding high inputs of new nitrogen sources should be the focus of future nitrogen environmental management. (C) 2020 Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[41890822] ; National Natural Science Foundation of China[41890824] ; National Natural Science Foundation of China[41625006] ; National Natural Science Foundation of China[41561144005] ; National Natural Science Foundation of China[41761144066]
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000631725000125
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/160423]
专题	中国科学院地理科学与资源研究所
通讯作者	Guo, Qingjun
作者单位	1.Chinese Acad Sci, Ctr Environm Remediat, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 4.Chongqing Normal Univ, Coll Geog & Tourism, Chongqing 401331, Peoples R China 5.Southern Univ Sci & Technol, Acad Adv Interdisciplinary Studies, Shenzhen 518055, Peoples R China
推荐引用方式 GB/T 7714	Cui, Meng,Guo, Qingjun,Wei, Rongfei,et al. Temporal-spatial dynamics of anthropogenic nitrogen inputs and hotspots in a large river basin[J]. CHEMOSPHERE,2021,269:12.
APA	Cui, Meng,Guo, Qingjun,Wei, Rongfei,&Chen, Ting.(2021).Temporal-spatial dynamics of anthropogenic nitrogen inputs and hotspots in a large river basin.CHEMOSPHERE,269,12.
MLA	Cui, Meng,et al."Temporal-spatial dynamics of anthropogenic nitrogen inputs and hotspots in a large river basin".CHEMOSPHERE 269(2021):12.