气候变化领域集成服务门户(CCPortal): The Predominance of Nongrowing Season Emissions to the Annual Methane Budget of a Semiarid Alpine Meadow on the Northeastern Qinghai-Tibetan Plateau

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DOI	10.1007/s10021-021-00669-x
	The Predominance of Nongrowing Season Emissions to the Annual Methane Budget of a Semiarid Alpine Meadow on the Northeastern Qinghai-Tibetan Plateau
	Li, Hongqin; Zhu, Jingbin; Zhang, Fawei; Qin, Gang; Yang, Yongsheng; Li, Yikang; Wang, Junbang; Cao, Guangmin; Li, Yingnian; Zhou, Huakun; Du, Mingyuan
通讯作者	Zhang, FW (通讯作者)，Chinese Acad Sci, Inst Sanjiangyuan Natl Pk, 23 Xinning St, Xining 810001, Qinghai, Peoples R China. ; Zhang, FW (通讯作者)，Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China. ; Zhang, FW (通讯作者)，Chinese Acad Sci, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China. ; Wang, JB (通讯作者)，Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China.
发表日期	2022
ISSN	1432-9840
EISSN	1435-0629
起始页码	526
结束页码	536
卷号	25 期号:3
英文摘要	The terrestrial methane budget varies between different vegetation types and soil conditions and is highly uncertain for alpine grasslands. This work used eddy covariance techniques to continuously measure CH4 flux (NEEm) over a semiarid alpine meadow on the northeastern Qinghai-Tibetan Plateau from January 2017 to August 2019. The diel NEEm averaged 0.14 +/- 0.98 nmol CH4 m(-2) s(-1) (mean +/- S.D.), with a rough pattern of daytime release and nocturnal uptake. The 8-day NEEm exhibited a similar sinusoid variation, with a peak of 6.8 mg CH4 m(-2) d(-1) at the end of April and a minimum of -1.5 mg CH4 m(-2) d(-1) at the end of August. The maximum release probably coincided with the thawing of frozen soil in the root zone, and the peak uptake may be related to high soil temperature. Monthly CH4 uptake was highest from June to September and consumed 51.7 mg CH4 m(-2) from the atmosphere. CH4 production in the other months totaled 647.6 mg CH4 m(-2). The semiarid alpine meadow thus acted as a weak net CH4 source, releasing ca 0.6 g CH4 m(-2) year(-1) to the atmosphere. The boosted regression trees analysis shows that the sensible heat flux (H) is positively related to half-hour NEEm and accounted for 34% of its variability. The piecewise structural equation models reveal that the magnitude of the effects from soil temperature and vapor pressure deficit on 8-day and monthly NEEm were almost equal, but acted in opposite directions. Vegetation growth and soil moisture exerted little direct influence on NEEm variability at half-hour, 8-day, or monthly scales. Our results show that CH4 emissions of the nongrowing season dominate the annual methane budget for this alpine meadow area. Methane consumption during the growing season was significantly constrained by low soil temperature and high soil water content. These findings imply that semiarid alpine meadows may consume more methane during the growing season if soil temperatures increase and soil moisture levels decrease as projected by future warming scenarios, thus constituting a climate change negative feedback.
关键词	SPATIAL VARIABILITY PLANT-COMMUNITIES CO2 FLUXES CH4 VEGETATION GRASSLANDS SHRUBLAND
英文关键词	eddy covariance technique; methane flux; boosted regression trees; structural equation models; alpine meadow; qinghai-Tibetan Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:000672115000004
来源期刊	ECOSYSTEMS
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/254654
作者单位	[Li, Hongqin; Qin, Gang; Li, Yingnian] Luoyang Normal Univ, Coll Life Sci, Luoyang 471934, Henan, Peoples R China; [Li, Hongqin; Zhang, Fawei; Yang, Yongsheng] Chinese Acad Sci, Inst Sanjiangyuan Natl Pk, 23 Xinning St, Xining 810001, Qinghai, Peoples R China; [Li, Hongqin; Zhang, Fawei; Yang, Yongsheng; Li, Yikang; Cao, Guangmin; Zhou, Huakun] Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China; [Zhu, Jingbin] Zaozhuang Univ, Coll Tourism Resources & Environm, Zaozhuang 277100, Shandong, Peoples R China; [Zhang, Fawei; Zhou, Huakun] Chinese Acad Sci, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China; [Wang, Junbang] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China; [Du, Mingyuan] Natl Agr & Food Res Org, Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan
推荐引用方式 GB/T 7714	Li, Hongqin,Zhu, Jingbin,Zhang, Fawei,et al. The Predominance of Nongrowing Season Emissions to the Annual Methane Budget of a Semiarid Alpine Meadow on the Northeastern Qinghai-Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2022,25(3).
APA	Li, Hongqin.,Zhu, Jingbin.,Zhang, Fawei.,Qin, Gang.,Yang, Yongsheng.,...&Du, Mingyuan.(2022).The Predominance of Nongrowing Season Emissions to the Annual Methane Budget of a Semiarid Alpine Meadow on the Northeastern Qinghai-Tibetan Plateau.ECOSYSTEMS,25(3).
MLA	Li, Hongqin,et al."The Predominance of Nongrowing Season Emissions to the Annual Methane Budget of a Semiarid Alpine Meadow on the Northeastern Qinghai-Tibetan Plateau".ECOSYSTEMS 25.3(2022).