Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau
High-latitude and high-altitude regions contain vast stores of permafrost carbon. Climate warming may result in the release of CO2 from both the thawing of permafrost and accelerated autotrophic respiration, but it may also increase the fixation of CO2 by plants, which could relieve or even offset t...
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ftchinacadscimhe:oai:ir.imde.ac.cn:131551/56245 2023-05-15T17:56:50+02:00 Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau Wei, Da Qi, Yahui Ma, Yaoming Wang, Xufeng Ma, Weiqiang Gao, Tanguang Huang, Lin Zhao, Hui Zhang, Jianxin Wang, Xiaodan 2021-08-17 http://ir.imde.ac.cn/handle/131551/56245 https://doi.org/10.1073/pnas.2015283118 英语 eng NATL ACAD SCIENCES PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA http://ir.imde.ac.cn/handle/131551/56245 doi:10.1073/pnas.2015283118 permafrost carbon climate change eddy covariance Tibetan Plateau CARBON BALANCE INTERANNUAL VARIATIONS MODEL SIMULATIONS CLIMATE-CHANGE ECOSYSTEMS SENSITIVITY DYNAMICS FLUXES DECOMPOSITION ACCUMULATION Science & Technology - Other Topics Multidisciplinary Sciences 期刊论文 2021 ftchinacadscimhe https://doi.org/10.1073/pnas.2015283118 2022-12-19T18:29:34Z High-latitude and high-altitude regions contain vast stores of permafrost carbon. Climate warming may result in the release of CO2 from both the thawing of permafrost and accelerated autotrophic respiration, but it may also increase the fixation of CO2 by plants, which could relieve or even offset the CO2 losses. The Tibetan Plateau contains the largest area of alpine permafrost on Earth. However, the current status of the net CO2 balance and feedbacks to warming remain unclear, given that the region has recently experienced an atmospheric warming rate of over 0.3 degrees C decade(-1). We examined 32 eddy covariance sites and found an unexpected net CO2 sink during 2002 to 2020 (26 of the sites yielded a net CO2 sink) that was four times the amount previously estimated. The CO2 sink peaked at an altitude of roughly 4,000 m, with the sink at lower and higher altitudes limited by a low carbon use efficiency and a cold, dry climate, respectively. The fixation of CO2 in summer is more dependent on temperature than the loss of CO2 than it is in the winter months, especially at higher altitudes. Consistently, 16 manipulative experiments and 18 model simulations showed that the fixation of CO2 by plants will outpace the loss of CO2 under a wetting-warming climate until the 2090s (178 to 318 Tg C y(-1)). We therefore suggest that there is a plant-dominated negative feedback to climate warming on the Tibetan Plateau. Report permafrost IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) Proceedings of the National Academy of Sciences 118 33 e2015283118 |
institution |
Open Polar |
collection |
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) |
op_collection_id |
ftchinacadscimhe |
language |
English |
topic |
permafrost carbon climate change eddy covariance Tibetan Plateau CARBON BALANCE INTERANNUAL VARIATIONS MODEL SIMULATIONS CLIMATE-CHANGE ECOSYSTEMS SENSITIVITY DYNAMICS FLUXES DECOMPOSITION ACCUMULATION Science & Technology - Other Topics Multidisciplinary Sciences |
spellingShingle |
permafrost carbon climate change eddy covariance Tibetan Plateau CARBON BALANCE INTERANNUAL VARIATIONS MODEL SIMULATIONS CLIMATE-CHANGE ECOSYSTEMS SENSITIVITY DYNAMICS FLUXES DECOMPOSITION ACCUMULATION Science & Technology - Other Topics Multidisciplinary Sciences Wei, Da Qi, Yahui Ma, Yaoming Wang, Xufeng Ma, Weiqiang Gao, Tanguang Huang, Lin Zhao, Hui Zhang, Jianxin Wang, Xiaodan Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau |
topic_facet |
permafrost carbon climate change eddy covariance Tibetan Plateau CARBON BALANCE INTERANNUAL VARIATIONS MODEL SIMULATIONS CLIMATE-CHANGE ECOSYSTEMS SENSITIVITY DYNAMICS FLUXES DECOMPOSITION ACCUMULATION Science & Technology - Other Topics Multidisciplinary Sciences |
description |
High-latitude and high-altitude regions contain vast stores of permafrost carbon. Climate warming may result in the release of CO2 from both the thawing of permafrost and accelerated autotrophic respiration, but it may also increase the fixation of CO2 by plants, which could relieve or even offset the CO2 losses. The Tibetan Plateau contains the largest area of alpine permafrost on Earth. However, the current status of the net CO2 balance and feedbacks to warming remain unclear, given that the region has recently experienced an atmospheric warming rate of over 0.3 degrees C decade(-1). We examined 32 eddy covariance sites and found an unexpected net CO2 sink during 2002 to 2020 (26 of the sites yielded a net CO2 sink) that was four times the amount previously estimated. The CO2 sink peaked at an altitude of roughly 4,000 m, with the sink at lower and higher altitudes limited by a low carbon use efficiency and a cold, dry climate, respectively. The fixation of CO2 in summer is more dependent on temperature than the loss of CO2 than it is in the winter months, especially at higher altitudes. Consistently, 16 manipulative experiments and 18 model simulations showed that the fixation of CO2 by plants will outpace the loss of CO2 under a wetting-warming climate until the 2090s (178 to 318 Tg C y(-1)). We therefore suggest that there is a plant-dominated negative feedback to climate warming on the Tibetan Plateau. |
format |
Report |
author |
Wei, Da Qi, Yahui Ma, Yaoming Wang, Xufeng Ma, Weiqiang Gao, Tanguang Huang, Lin Zhao, Hui Zhang, Jianxin Wang, Xiaodan |
author_facet |
Wei, Da Qi, Yahui Ma, Yaoming Wang, Xufeng Ma, Weiqiang Gao, Tanguang Huang, Lin Zhao, Hui Zhang, Jianxin Wang, Xiaodan |
author_sort |
Wei, Da |
title |
Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau |
title_short |
Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau |
title_full |
Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau |
title_fullStr |
Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau |
title_full_unstemmed |
Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau |
title_sort |
plant uptake of co2 outpaces losses from permafrost and plant respiration on the tibetan plateau |
publisher |
NATL ACAD SCIENCES |
publishDate |
2021 |
url |
http://ir.imde.ac.cn/handle/131551/56245 https://doi.org/10.1073/pnas.2015283118 |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA http://ir.imde.ac.cn/handle/131551/56245 doi:10.1073/pnas.2015283118 |
op_doi |
https://doi.org/10.1073/pnas.2015283118 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
118 |
container_issue |
33 |
container_start_page |
e2015283118 |
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1766165137566203904 |