气候变化领域集成服务门户(CCPortal): Tracing Microbial Production and Consumption Sources of N2O in Rivers on the Qinghai-Tibet Plateau via Isotopocule and Functional Microbe Analyses

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DOI	10.1021/acs.est.3c00950
	Tracing Microbial Production and Consumption Sources of N2O in Rivers on the Qinghai-Tibet Plateau via Isotopocule and Functional Microbe Analyses
	Chen, Xin; Zhang, Sibo; Liu, Jiao; Wang, Junfeng; Xin, Yuan; Sun, Siyue; Xia, Xinghui
发表日期	2023
ISSN	0013-936X
EISSN	1520-5851
起始页码	7196
结束页码	7205
卷号	57 期号:18
英文摘要	Nitrous oxide (N2O), a potent greenhouse gas, is produced in rivers through a series of microbial metabolic pathways. However, the microbial source of N2O production and the degree of N2O reduction in river systems are not well understood and quantified. This work investigated isotopic compositions (515N-N2O and 518O-N2O) and N2O site preference as well as N2O-related microbial features, thereby differentiating the importance of nitrification, denitrification, and N2O reduction in controlling N2O emissions from five rivers on the eastern Qinghai-Tibet Plateau (EQTP). The average N2O concentration in overlying water (15.2 nmol L-1) was close to that in porewater (17.5 nmol L-1), suggesting that both overlying water and sediment are potentially important sources of N2O. Canonical and nitrifier denitrification dominated riverine N2O production, with contribution being approximately 90%. Nitrification is a nonnegligible source of N2O production, and N2O concentration was positively correlated with nitrification genetic potential. The degree of N2O reduction ranged from 78.1 to 94.1% (averaging 90%), significantly exceeding the reported values (averaging 70%) in other freshwaters, which was attributed to the higher ratios of organic carbon to nitrogen and lower ratio of (nirS + nirK)/nosZ in EQTP rivers. This study indicates that a combination of isotopic and isotopocule values with functional microbe analysis is useful for quantifying the microbial sources of N2O in rivers, and the intense microbial reduction of N2O significantly accounts for the low N2O emissions observed in EQTP rivers, suggesting that both the production and consumption of N2O in rivers should be considered in the future.
关键词	nitrous oxide (N 2 O)site preference isotopic signature denitrification river functional gene
英文关键词	NITROUS-OXIDE; SUSPENDED SEDIMENT; DENITRIFICATION; WATER; ISOTOPOMERS; EMISSION; METHANE; STREAMS
WOS研究方向	Engineering, Environmental ; Environmental Sciences
WOS记录号	WOS:000982330100001
来源期刊	ENVIRONMENTAL SCIENCE & TECHNOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283294
作者单位	Beijing Normal University; Guangdong University of Technology
推荐引用方式 GB/T 7714	Chen, Xin,Zhang, Sibo,Liu, Jiao,et al. Tracing Microbial Production and Consumption Sources of N2O in Rivers on the Qinghai-Tibet Plateau via Isotopocule and Functional Microbe Analyses[J],2023,57(18).
APA	Chen, Xin.,Zhang, Sibo.,Liu, Jiao.,Wang, Junfeng.,Xin, Yuan.,...&Xia, Xinghui.(2023).Tracing Microbial Production and Consumption Sources of N2O in Rivers on the Qinghai-Tibet Plateau via Isotopocule and Functional Microbe Analyses.ENVIRONMENTAL SCIENCE & TECHNOLOGY,57(18).
MLA	Chen, Xin,et al."Tracing Microbial Production and Consumption Sources of N2O in Rivers on the Qinghai-Tibet Plateau via Isotopocule and Functional Microbe Analyses".ENVIRONMENTAL SCIENCE & TECHNOLOGY 57.18(2023).