气候变化领域集成服务门户(CCPortal): Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau

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DOI	10.1073/pnas.2015283118
	Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau
	Wei D.; Qi Y.; Ma Y.; Wang X.; Ma W.; Gao T.; Huang L.; Zhao H.; Zhang J.; Wang X.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:33
英文摘要	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 °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. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Carbon; Climate change; Eddy covariance; Permafrost; Tibetan Plateau
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
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/238439
作者单位	Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China; Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China; Institute of Geophysical Science and Natural Resource Research, Chinese Academy of Sciences, Beijing, 100101, China
推荐引用方式 GB/T 7714	Wei D.,Qi Y.,Ma Y.,et al. Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2021,118(33).
APA	Wei D..,Qi Y..,Ma Y..,Wang X..,Ma W..,...&Wang X..(2021).Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau.Proceedings of the National Academy of Sciences of the United States of America,118(33).
MLA	Wei D.,et al."Plant uptake of CO2 outpaces losses from permafrost and plant respiration on the Tibetan Plateau".Proceedings of the National Academy of Sciences of the United States of America 118.33(2021).