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	Nitrogen wet deposition in the Three Gorges Reservoir area: Characteristics, fluxes, and contributions to the aquatic environment
	Zhang, Liuyi1,2; Tian, Mi3; Peng, Chao2; Fu, Chuan1; Li, Tingzhen1; Chen, Yang2; Qiu, Yang4; Huang, Yimin1; Wang, Huanbo2,3; Li, Zhe2
	2020-10-10
摘要	Measurements of nitrate nitrogen (NO3--N), ammonia nitrogen (NH4+-N), and dissolved organic nitrogen (DON) in precipitation were conducted at six different sites in the hinterland of the Three Gorges Reservoir (TGR) area fromJanuary 2016 to December 2017. The characteristics and the sources of nitrogen (N) specieswere identified. N flux of wet deposition in the hinterland of the TGR area were 13.56 +/- 2.95 kg N ha(-1) yr(-1), of which the proportions of NO3--N, NH4+-N and DON were 60.9%, 25.1% and 14.0%, respectively. N flux in urban area was significantly higher than those in suburban, agricultural, andwetland areas. Industrial activities, biomass burning, and secondary transformation were the main contributors of N in urban area. In agricultural area, biomass burning, crustal, and manure were main sources of N. In suburban area, mixed emissions from industry, agriculture, and crustal sources were primary contributors of N. For wetlands, the major contributions were from industrial sector and biomass burning. Additional, analysis of regional distribution of dissolvedN deposition in the TGR area was conducted by combining current study data and previously published data between 2000 and 2017. N flux of wet deposition in the entire TGR area ranged from 12.17 to 51.93 kg N ha(-1) yr(-1), with an average of 26.81 kg N ha(-1) yr(-1). Regional N distribution was greatest in the tail region, followed by the head region, and then the hinterland in the TGR area. The amount of N entering the TGR directly through atmospheric wet deposition was 2906 t yr(-1), accounting for 2.1% of the total N inputs. N load from wet deposition had exceeded the critical loads from that of the water, forest, and even some farmland ecosystems in the TGR area. Decreasing NH3 emissions from agricultural activities is the key to alleviate the regional N deposition. (c) 2020 Elsevier B.V. All rights reserved.
关键词	Nitrogen deposition Spatial distribution Critical load Three Gorges Reservoir
DOI	10.1016/j.scitotenv.2020.140309
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
卷号	738页码:10
通讯作者	Li, Tingzhen(litingzhen@163.com) ; Yang, Fumo(fmyang@scu.edu.cn)
收录类别	SCI
WOS记录号	WOS:000559768800015
语种	英语