气候变化领域集成服务门户(CCPortal): Decelerating Autumn CO2 Release With Warming Induced by Attenuated Temperature Dependence of Respiration in Northern Ecosystems

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DOI	10.1029/2018GL077447
	Decelerating Autumn CO2 Release With Warming Induced by Attenuated Temperature Dependence of Respiration in Northern Ecosystems
	Liu, Dan; Piao, Shilong; Wang, Tao; Wang, Xuhui; Wang, Xiaoyi; Ding, Jinzhi; Ciais, Philippe; Penuelas, Josep; Janssens, Ivan
通讯作者	Piao, SL (通讯作者)
发表日期	2018
ISSN	0094-8276
EISSN	1944-8007
起始页码	5562
结束页码	5571
卷号	45 期号:11
英文摘要	Feedbacks from the carbon cycle in boreal and arctic ecosystems can significantly affect climate change, but the effects of climate change on the high-latitude carbon cycle during the dormant period remain uncertain. By analyzing the long-term atmospheric CO2 concentration record from Point Barrow in Alaska, we show that warming significantly boosts net CO2 release in autumn over the period 1974-2014. But this warming-stimulated effect has been attenuated since 1997. This deceleration of net CO2 release with warming is ascribed to the attenuation in respiration response to temperature rather than changing relationship between temperature and productivity or changes in atmospheric transport, fossil fuel emissions, or air-sea CO2 exchanges. The attenuated respiration response is likely due to decoupling between temperature and plant-derived carbon inputs to soil for decomposition. Contrary to previous suggestions, warming no longer results in a higher autumn net CO2 release. Plain Language Summary Boreal and arctic ecosystems are highly sensitive to climate change. Most of previous studies focus on terrestrial carbon cycle responding to warming during carbon uptake period, while much less on the dormant season that characteristic with net carbon release. We provide the first evidence that autumn warming no longer accelerates net carbon losses in boreal and arctic ecosystem as previously suggested. This deceleration of net CO2 release with autumn warming is attributed to the attenuation in respiration response to temperature, which interestingly, is most likely due to the recently reported weakening relationship between temperature and productivity. Our finding counteracts recently reported warming-induced loss of net CO2 uptake during carbon uptake period, which provides a negative feedback to climate warming.
关键词	ATMOSPHERIC CARBON-DIOXIDE SOIL RESPIRATION PLANT RESPIRATION CLIMATE-CHANGE MODEL SENSITIVITY CYCLE ACCLIMATION SATELLITE ALASKA
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000436249900039
来源期刊	GEOPHYSICAL RESEARCH LETTERS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259371
推荐引用方式 GB/T 7714	Liu, Dan,Piao, Shilong,Wang, Tao,et al. Decelerating Autumn CO2 Release With Warming Induced by Attenuated Temperature Dependence of Respiration in Northern Ecosystems[J]. 中国科学院青藏高原研究所,2018,45(11).
APA	Liu, Dan.,Piao, Shilong.,Wang, Tao.,Wang, Xuhui.,Wang, Xiaoyi.,...&Janssens, Ivan.(2018).Decelerating Autumn CO2 Release With Warming Induced by Attenuated Temperature Dependence of Respiration in Northern Ecosystems.GEOPHYSICAL RESEARCH LETTERS,45(11).
MLA	Liu, Dan,et al."Decelerating Autumn CO2 Release With Warming Induced by Attenuated Temperature Dependence of Respiration in Northern Ecosystems".GEOPHYSICAL RESEARCH LETTERS 45.11(2018).