气候变化领域集成服务门户(CCPortal): Considerable methane uptake by alpine grasslands despite the cold climate: in situ measurements on the central Tibetan Plateau, 2008-2013

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DOI	10.1111/gcb.12690
	Considerable methane uptake by alpine grasslands despite the cold climate: in situ measurements on the central Tibetan Plateau, 2008-2013
	Wei, Da; Xu-Ri; Tenzin-Tarchen; Wang, Yuesi; Wang, Yinghong
通讯作者	Xu-Ri (通讯作者)
发表日期	2015
ISSN	1354-1013
EISSN	1365-2486
起始页码	777
结束页码	788
卷号	21 期号:2
英文摘要	The uptake of CH4 by aerate soil plays a secondary role in the removal of tropospheric CH4, but it is still highly uncertain in terms of its magnitude, spatial, and temporal variation. In an attempt to quantify the sink of the vast alpine grasslands (1400000km(2)) of the Tibetan Plateau, we conducted in situ measurements in an alpine steppe (4730m) and alpine meadow (4900m) using the static chamber and gas chromatograph method. For the alpine steppe, measurements (2008-2013) suggested that there is large interannual variability in CH4 uptake, ranging from -48.8 to -95.8g CH(4)m(-2)h(-1) (averaged of -71.5 +/- 2.5g CH(4)m(-2)h(-1)), due to the variability in precipitation seasonality. The seasonal pattern of CH4 uptakes in the form of stronger uptake in the early growing season and weaker uptake in the rainy season closely matched the precipitation seasonality and subsequent soil moisture variation. The relationships between alpine steppe CH4 uptake and soil moisture/temperature are best depicted by a quadratic function and an exponential function (Q(10)=1.67) respectively. Our measurements also showed that the alpine meadow soil (average of -59.2 +/- 3.7g CH(4)m(-2)h(-1)) uptake less CH4 than the alpine steppe and produces a similar seasonal pattern, which is negatively regulated by soil moisture. Our measurements quantified - at values far higher than those estimated by process-based models - that both the alpine steppe and alpine meadow are considerable CH4 sinks, despite the cold weather of this high-altitude area. The consecutive measurements gathered in this study also highlight that precipitation seasonality tends to drive the interannual variation in CH4 uptake, indicating that future study should be done to better characterize how CH4 cycling might feedback to the more extreme climate.
关键词	ATMOSPHERIC METHANE NITROGEN DEPOSITION N2O FLUXES CH4 EMISSIONS SOIL CONSUMPTION CO2 RESPONSES OXIDATION
英文关键词	alpine meadow; alpine steppe; CH4 sink; soil moisture; Tibetan Plateau
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:000348652400023
来源期刊	GLOBAL CHANGE BIOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258478
推荐引用方式 GB/T 7714	Wei, Da,Xu-Ri,Tenzin-Tarchen,et al. Considerable methane uptake by alpine grasslands despite the cold climate: in situ measurements on the central Tibetan Plateau, 2008-2013[J]. 中国科学院青藏高原研究所,2015,21(2).
APA	Wei, Da,Xu-Ri,Tenzin-Tarchen,Wang, Yuesi,&Wang, Yinghong.(2015).Considerable methane uptake by alpine grasslands despite the cold climate: in situ measurements on the central Tibetan Plateau, 2008-2013.GLOBAL CHANGE BIOLOGY,21(2).
MLA	Wei, Da,et al."Considerable methane uptake by alpine grasslands despite the cold climate: in situ measurements on the central Tibetan Plateau, 2008-2013".GLOBAL CHANGE BIOLOGY 21.2(2015).