气候变化领域集成服务门户(CCPortal): Warming and Increased Respiration Have Transformed an Alpine Steppe Ecosystem on the Tibetan Plateau From a Carbon Dioxide Sink Into a Source

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DOI	10.1029/2021JG006406
	Warming and Increased Respiration Have Transformed an Alpine Steppe Ecosystem on the Tibetan Plateau From a Carbon Dioxide Sink Into a Source
	Yun, Hanbo; Tang, Jing; D'Imperio, Ludovica; Wang, Xiaobo; Qu, Yang; Liu, Licheng; Zhuang, Qianlai; Zhang, Wenxin; Wu, Qingbai; Chen, Anping; Zhu, Qing; Chen, Deliang; Elberling, Bo
通讯作者	Wu, QB (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, BeiLuHe Stn, Slate Key Lab Frozen Soil Engn, Lanzhou, Peoples R China. ; Elberling, B (通讯作者)，Univ Copenhagen, Dept Geosci & Nat Resource Management, Ctr Permafrost CENPERM, Copenhagen, Denmark. ; Chen, AP (通讯作者)，Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA.
发表日期	2022
ISSN	2169-8953
EISSN	2169-8961
卷号	127 期号:1
英文摘要	Cold region ecosystems store vast amounts of soil organic carbon (C), which upon warming and decomposition can affect the C balance and potentially change these ecosystems from C sinks to carbon dioxide (CO2) sources. We quantified the decadal year-round CO2 flux from an alpine steppe-ecosystem on the Tibetan Plateau using eddy covariance and automatic chamber approaches during a period of significant warming (0.13 degrees C per 10 years; and 0.18 degrees C in the non-growing season alone: 1st October to next 30th April). The results showed that ongoing climate change, mainly warming within the topsoil layers, is the main reason for the site's change from a sink for to a source of CO2 in the atmosphere. Non-growing-season ecosystem respiration accounted for 51% of the annual ecosystem respiration and has increased significantly. The growing seasons (1st May to 30th September) were consistent CO2 sink periods without significant changes over the study period. Observations revealed high-emission events from the end of the non-growing season to early in the growing season (1st March to fifteenth May), which significantly (p < 0.01) increased at a rate of 22.6 g C m(-2) decade(-1), ranging from 14.6 +/- 10.7 g C m(-2) yr(-1) in 2012 to 35.3 +/- 12.1 g C m(-2) yr(-1) in 2017. Structural equation modeling suggested that active layer warming was the key factor in explaining changes in ecosystem respiration, leading to significant changes in net ecosystem exchange over the period 2011-2020 and indicated that these changes have already transformed the ecosystem from a CO2 sink into a source. These results can be used to improve our understanding of the sensitivity of ecosystem respiration to increased warming during the non-growing period.
关键词	CO2 EXCHANGE PERMAFROST THAW TUNDRA ECOSYSTEMS POLYGONAL TUNDRA NET CARBON SOIL FLUX RELEASE DEGRADATION TEMPERATURE
英文关键词	Tibetan Plateau; carbon sink; alpine steppe ecosystem; eddy covariance; automatic chamber; soil respiration
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:000751889000009
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
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/254157
作者单位	[Yun, Hanbo; Wu, Qingbai] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, BeiLuHe Stn, Slate Key Lab Frozen Soil Engn, Lanzhou, Peoples R China; [Yun, Hanbo; D'Imperio, Ludovica; Zhang, Wenxin; Elberling, Bo] Univ Copenhagen, Dept Geosci & Nat Resource Management, Ctr Permafrost CENPERM, Copenhagen, Denmark; [Yun, Hanbo; Zhuang, Qianlai] Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA; [Tang, Jing; Zhang, Wenxin] Lund Univ, Dept Phys Geog & Ecosyst Sci, Lund, Sweden; [Wang, Xiaobo] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin, Lanzhou, Peoples R China; [Qu, Yang] East China Normal Univ, Sch Urban & Reg Sci, Shanghai, Peoples R China; [Liu, Licheng] Univ Minnesota, Dept Bioprod & Biosyst Engn, St Paul, MN 55108 USA; [Chen, Anping] Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA; [Chen, Anping] Colorado State Univ, Grad Degree Program Ecol, Ft Collins, CO 80523 USA; [Zhu, Qing] Lawrence Berkeley Natl Lab, Clima...
推荐引用方式 GB/T 7714	Yun, Hanbo,Tang, Jing,D'Imperio, Ludovica,et al. Warming and Increased Respiration Have Transformed an Alpine Steppe Ecosystem on the Tibetan Plateau From a Carbon Dioxide Sink Into a Source[J]. 中国科学院西北生态环境资源研究院,2022,127(1).
APA	Yun, Hanbo.,Tang, Jing.,D'Imperio, Ludovica.,Wang, Xiaobo.,Qu, Yang.,...&Elberling, Bo.(2022).Warming and Increased Respiration Have Transformed an Alpine Steppe Ecosystem on the Tibetan Plateau From a Carbon Dioxide Sink Into a Source.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,127(1).
MLA	Yun, Hanbo,et al."Warming and Increased Respiration Have Transformed an Alpine Steppe Ecosystem on the Tibetan Plateau From a Carbon Dioxide Sink Into a Source".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 127.1(2022).