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DOI	10.1016/j.scitotenv.2021.150172
	Precipitation changes regulate the annual methane uptake in a temperate desert steppe
	Yue, Ping; Zuo, Xiaoan; Li, Kaihui; Li, Xiangyun; Wang, Shaokun; Misselbrook, Tom
通讯作者	Zuo, XA (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Urat Desert Grassland Res Stn, Lanzhou 730000, Peoples R China.
发表日期	2022
ISSN	0048-9697
EISSN	1879-1026
卷号	804
英文摘要	Desert soils are an important sink of atmospheric methane (CH4) and regulate the global CH4 budget. However, it is still unclear how CH4 fluxes respond to precipitation changes in desert-steppe soils. Therefore, a two-year in situ control experiment was conducted to investigate the effect of precipitation changes on CH4 uptake in desert steppe of Inner Mongolia in northwest China and its driving mechanism. The result showed that this desert steppe was an important sink of CH4. with an annual uptake of 2.93 (2.64-322) kg C ha(-1). It was found that CH4 uptake was reduced significantly for decreasing precipitation, especially in spring and summer. In contrast, an increasing trend of CH4 uptake was observed for increasing precipitation, although it was not statistically significant. Further analyses found that CH4 uptake was more sensitive to decreasing precipitation than increasing precipitation. This may be mainly due to the fact that only moderate water-filled pore space (WFPS) induced by precipitation promoted CH4 uptake, while too-high (>32%) or too-low WFPS inhibited its uptake. A structural equation model showed that the copy number of the pmoA functional gene was the most important factor affecting CH4 uptake. In contrast, soil moisture had a very important indirect effect on CH4 uptake, mainly through significantly affected soil porosity, the above-ground plant biomass and NO3--N content, further affected CH4 uptake. Overall. CH4 sinks in desert steppe was still mainly controlled by methane-oxidizing bacteria containing the key functional gene pmoA and WFPS. Therefore, precipitation plays an important role in regulating the intensity of CH4 sinks in desert steppe, while it is worth noting that too-little precipitation will significantly weaken CH4 sinks. (C) 2021 Elsevier B.V. All rights reserved.
关键词	INNER-MONGOLIA INCREASING PRECIPITATION ATMOSPHERIC METHANE SOIL-MOISTURE CH4 UPTAKE CONSUMPTION OXIDATION FLUXES GRASSLANDS FOREST
英文关键词	Precipitation changes; Methane flux; Functional genes; Temperate desert steppe
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000701742400002
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253942
作者单位	[Yue, Ping; Zuo, Xiaoan] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Urat Desert Grassland Res Stn, Lanzhou 730000, Peoples R China; [Yue, Ping; Zuo, Xiaoan; Li, Xiangyun; Wang, Shaokun] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Naiman Desertificat Res Stn, Lanzhou 730000, Peoples R China; [Yue, Ping; Zuo, Xiaoan; Li, Xiangyun; Wang, Shaokun] Key Lab Stress Physiol & Ecol, Lanzhou 730000, Gansu, Peoples R China; [Li, Kaihui] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China; [Misselbrook, Tom] Rothamsted Res, Northwyke EX20 2SB, Devon, England
推荐引用方式 GB/T 7714	Yue, Ping,Zuo, Xiaoan,Li, Kaihui,et al. Precipitation changes regulate the annual methane uptake in a temperate desert steppe[J]. 中国科学院西北生态环境资源研究院,2022,804.
APA	Yue, Ping,Zuo, Xiaoan,Li, Kaihui,Li, Xiangyun,Wang, Shaokun,&Misselbrook, Tom.(2022).Precipitation changes regulate the annual methane uptake in a temperate desert steppe.SCIENCE OF THE TOTAL ENVIRONMENT,804.
MLA	Yue, Ping,et al."Precipitation changes regulate the annual methane uptake in a temperate desert steppe".SCIENCE OF THE TOTAL ENVIRONMENT 804(2022).