Dominance of nitrous oxide production by nitrification and denitrification in the shallow Chaohu Lake, Eastern China: Insight from isotopic characteristics of dissolved nitrous oxide

doi:10.1016/j.envpol.2019.113212

	Dominance of nitrous oxide production by nitrification and denitrification in the shallow Chaohu Lake, Eastern China: Insight from isotopic characteristics of dissolved nitrous oxide
	Li, Qingqian 1,3; Wang, Fang 3; Yu, Qibiao 3; Yan, Weijin 3; Li, Xinyan 2; Lv, Shucong 3
刊名	ENVIRONMENTAL POLLUTION
	2019-12-01
卷号	255 页码:11
关键词	N2O Isotopic composition Site preference Nitrification Denitrification
ISSN号	0269-7491
DOI	10.1016/j.envpol.2019.113212
通讯作者	Yan, Weijin(yanwj@igsnrr.ac.cn)
英文摘要	In recent decades, most lakes in Eastern China have suffered unprecedented nitrogen pollution, making them potential "hotspots" for N2O production and emission. Understanding the mechanisms of N2O production and quantifying emissions in these lakes is essential for assessing regional and global N2O budgets and for mitigating N2O emissions. Here, we measure isotopic compositions (delta N-15-N2O and delta O-18-N2O) and site preference (SP) of dissolved N2O in an attempt to differentiate the relative contribution of N2O production processes in the shallow, eutrophic Chaohu Lake, Eastern China. Our results show that the bulk isotope ratios for delta N-15-N2O, delta O-18-N2O, and SP were 5.8 +/- 3.9 parts per thousand, 293 +/- 13.4 parts per thousand, and 18.6 +/- 3.2 parts per thousand, respectively. More than 76.8% of the dissolved N2O was produced via microbial processes. Findings suggest that dissolved N2O is primarily produced via nitrification (between 27.3% and 48.0%) and denitrification (between 31.9% and 49.5%). In addition, isotopic data exhibit significant N2O consumption during denitrification. We estimate the average N2O emission rate (27.5 +/- 26.0 mu g N m(-2) h(-1)), which is higher than that from rivers in the Changjiang River network (CRN). We scaled-up the regional N2O emission (from 1.98 Gg N yr(-1) to 4.58 Gg N yr(-1)) using a N2O emission factor (0.51 +/- 0.63%) for shallow lakes in the middle and lower region of the CRN. We suggest that beneficial circumstances for promoting complete denitrification may be helpful for reducing N2O production and emissions in fresh surface waters. (C) 2019 Elsevier Ltd. All rights reserved.
资助项目	National Key Research and Development Program of China[2016YFA0601004] ; National Key Research and Development Program of China[2016YFA0602704] ; National Natural Science Foundation of China[41877483] ; National Natural Science Foundation of China[41371454] ; National Natural Science Foundation of China[41771050] ; National Natural Science Foundation of China[41671479]
WOS关键词	CARBON-DIOXIDE ; FRESH-WATER ; FRACTIONATION FACTORS ; SUSPENDED SEDIMENT ; STABLE-ISOTOPE ; WIND-SPEED ; N2O ; REDUCTION ; EMISSIONS ; NITRATE
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000499733500093
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/130099]
专题	中国科学院地理科学与资源研究所
通讯作者	Yan, Weijin
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing 210008, Jiangsu, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Li, Qingqian,Wang, Fang,Yu, Qibiao,et al. Dominance of nitrous oxide production by nitrification and denitrification in the shallow Chaohu Lake, Eastern China: Insight from isotopic characteristics of dissolved nitrous oxide[J]. ENVIRONMENTAL POLLUTION,2019,255:11.
APA	Li, Qingqian,Wang, Fang,Yu, Qibiao,Yan, Weijin,Li, Xinyan,&Lv, Shucong.(2019).Dominance of nitrous oxide production by nitrification and denitrification in the shallow Chaohu Lake, Eastern China: Insight from isotopic characteristics of dissolved nitrous oxide.ENVIRONMENTAL POLLUTION,255,11.
MLA	Li, Qingqian,et al."Dominance of nitrous oxide production by nitrification and denitrification in the shallow Chaohu Lake, Eastern China: Insight from isotopic characteristics of dissolved nitrous oxide".ENVIRONMENTAL POLLUTION 255(2019):11.