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Warming and Increas...
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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- Yun, Hanbo (författare)
- University of the Chinese Academy of Sciences,University of Copenhagen,Purdue University
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- Tang, Jing (författare)
- Lund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
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- D’Imperio, Ludovica (författare)
- University of Copenhagen
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- Wang, Xiaobo (författare)
- University of the Chinese Academy of Sciences
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- Qu, Yang (författare)
- East China Normal University
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- Liu, Licheng (författare)
- University of Minnesota
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- Zhuang, Qianlai (författare)
- Purdue University
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- Zhang, Wenxin (författare)
- Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,MERGE: ModElling the Regional and Global Earth system,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
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- Wu, Qingbai (författare)
- University of the Chinese Academy of Sciences
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- Chen, Anping (författare)
- Colorado State University
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- Zhu, Qing (författare)
- Lawrence Berkeley National Laboratory
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- Chen, Deliang, 1961 (författare)
- Gothenburg University,Göteborgs universitet,University of Gothenburg,Institutionen för geovetenskaper,Department of Earth Sciences
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- Elberling, Bo (författare)
- University of Copenhagen
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(creator_code:org_t)
- 2022
- 2022
- Engelska.
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Ingår i: Journal of Geophysical Research: Biogeosciences. - 2169-8953 .- 2169-8961. ; 127:1
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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https://gup.ub.gu.se...
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Abstract
Ämnesord
Stäng
- 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°C per 10 years; and 0.18°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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- alpine steppe ecosystem
- automatic chamber
- carbon sink
- eddy covariance
- soil respiration
- Tibetan Plateau
Publikations- och innehållstyp
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- Av författaren/redakt...
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Yun, Hanbo
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Tang, Jing
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D’Imperio, Ludov ...
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Wang, Xiaobo
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Qu, Yang
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Liu, Licheng
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visa fler...
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Zhuang, Qianlai
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Zhang, Wenxin
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Wu, Qingbai
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Chen, Anping
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Zhu, Qing
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Chen, Deliang, 1 ...
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Elberling, Bo
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visa färre...
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