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The Predominance of Nongrowing Season Emissions to the Annual Methane Budget of a Semiarid Alpine Meadow on the Northeastern Qinghai-Tibetan Plateau

文献类型：期刊论文

作者Li, Hongqin1,2,3; Zhu, Jingbin4; Zhang, Fawei2,3,5; Qin, Gang1; Yang, Yongsheng2,3; Li, Yikang3; Wang, Junbang6; Cao, Guangmin3; Li, Yingnian1; Zhou, Huakun3,5
刊名ECOSYSTEMS
出版日期2021-07-09
页码11
ISSN号1432-9840
关键词eddy covariance technique methane flux boosted regression trees structural equation models alpine meadow qinghai-Tibetan Plateau
DOI10.1007/s10021-021-00669-x
通讯作者Zhang, Fawei(mywing963@126.com) ; Wang, Junbang(jbwang@igsnrr.ac.cn)
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.
WOS关键词SPATIAL VARIABILITY ; PLANT-COMMUNITIES ; CO2 FLUXES ; CH4 ; VEGETATION ; GRASSLANDS ; SHRUBLAND
资助项目Chinese Academy of Sciences-People's Government of Qinghai Province Joint Grant on Sanjiangyuan National Park Research[YHZX-2020-07] ; National Key RD Program[2017YFA0604802] ; National Natural Science Foundation of China[41730752] ; National Natural Science Foundation of China[41877547] ; Qinghai Innovation Platform Construction Project[2017-ZJ-Y20]
WOS研究方向Environmental Sciences & Ecology
语种英语
出版者SPRINGER
WOS记录号WOS:000672115000004
资助机构Chinese Academy of Sciences-People's Government of Qinghai Province Joint Grant on Sanjiangyuan National Park Research ; National Key RD Program ; National Natural Science Foundation of China ; Qinghai Innovation Platform Construction Project
源URL[http://ir.igsnrr.ac.cn/handle/311030/163835]  
专题中国科学院地理科学与资源研究所
通讯作者Zhang, Fawei; Wang, Junbang
作者单位1.Luoyang Normal Univ, Coll Life Sci, Luoyang 471934, Henan, Peoples R China
2.Chinese Acad Sci, Inst Sanjiangyuan Natl Pk, 23 Xinning St, Xining 810001, Qinghai, Peoples R China
3.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China
4.Zaozhuang Univ, Coll Tourism Resources & Environm, Zaozhuang 277100, Shandong, Peoples R China
5.Chinese Acad Sci, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China
6.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
7.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]. ECOSYSTEMS,2021:11.
APA Li, Hongqin.,Zhu, Jingbin.,Zhang, Fawei.,Qin, Gang.,Yang, Yongsheng.,...&Du, Mingyuan.(2021).The Predominance of Nongrowing Season Emissions to the Annual Methane Budget of a Semiarid Alpine Meadow on the Northeastern Qinghai-Tibetan Plateau.ECOSYSTEMS,11.
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 (2021):11.

入库方式： OAI收割

来源：地理科学与资源研究所

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