DOI: 10.1111/gcb.12690
论文题名: Considerable methane uptake by alpine grasslands despite the cold climate: In situ measurements on the central Tibetan Plateau, 2008-2013
作者: Wei D. ; Ri X. ; Tarchen T. ; Wang Y. ; Wang Y.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 2 起始页码: 777
结束页码: 788
语种: 英语
英文关键词: Alpine meadow
; Alpine steppe
; CH4 sink
; Soil moisture
; Tibetan Plateau
Scopus关键词: alpine environment
; annual variation
; biological uptake
; climate change
; climate effect
; extreme event
; growing season
; in situ measurement
; meadow
; methane
; seasonality
; source-sink dynamics
; China
; Qinghai-Xizang Plateau
; methane
; soil
; carbon cycle
; chemistry
; China
; cold climate
; grassland
; soil
; Carbon Cycle
; Cold Climate
; Grassland
; Methane
; Soil
; Tibet
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 (1 400 000 km2) of the Tibetan Plateau, we conducted in situ measurements in an alpine steppe (4730 m) and alpine meadow (4900 m) 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 -95.8 μg CH4 m-2 h-1 (averaged of -71.5 ± 2.5 μg CH4 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 (Q10 = 1.67) respectively. Our measurements also showed that the alpine meadow soil (average of -59.2 ± 3.7 μg CH4 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. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61557
Appears in Collections: 影响、适应和脆弱性
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作者单位: Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; Tibet University, Tibetan Autonomous Region, China; Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Wei D.,Ri X.,Tarchen T.,et al. Considerable methane uptake by alpine grasslands despite the cold climate: In situ measurements on the central Tibetan Plateau, 2008-2013[J]. Global Change Biology,2015-01-01,21(2)