Water scaling of ecosystem carbon cycle feedback to climate warming

被引:155
|
作者
Quan, Quan [1 ,2 ]
Tian, Dashuan [1 ]
Luo, Yiqi [3 ,4 ]
Zhang, Fangyue [1 ,2 ]
Crowthers, Tom W. [5 ]
Zhu, Kai [6 ]
Chen, Han Y. H. [7 ,8 ]
Zhou, Qingping [9 ]
Niu, Shuli [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
[2] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
[3] No Arizona Univ, Dept Biol Sci, Ctr Ecosyst Sci & Soc, Box 5640, Flagstaff, AZ 86011 USA
[4] Tsinghua Univ, Dept Earth Syst Sci, Beijing 100084, Peoples R China
[5] Swiss Fed Inst Technol, Inst Integrat Biol, Univ Str 16, CH-8006 Zurich, Switzerland
[6] Univ Calif Santa Cruz, Dept Environm Studies, Santa Cruz, CA 95060 USA
[7] Lakehead Univ, Fac Nat Resources Management, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada
[8] Fujian Normal Univ, Key Lab Humid Subtrop Ecogeog Proc, Minist Educ, Fuzhou 350007, Fujian, Peoples R China
[9] Southwest Univ Nationalities, Inst Qinghai Tibetan Plateau, Chengdu 610041, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
SOIL CO2 EFFLUX; HETEROTROPHIC RESPIRATION; PRIMARY PRODUCTIVITY; DIFFERENT RESPONSES; NORTH-AMERICA; ALPINE MEADOW; ELEVATED CO2; TEMPERATURE; EXCHANGE; MOISTURE;
D O I
10.1126/sciadv.aav1131
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
It has been well established by field experiments that warming stimulates either net ecosystem carbon uptake or release, leading to negative or positive carbon cycle-climate change feedback, respectively. This variation in carbon-climate feedback has been partially attributed to water availability. However, it remains unclear under what conditions water availability enhances or weakens carbon-climate feedback or even changes its direction. Combining a field experiment with a global synthesis, we show that warming stimulates net carbon uptake (negative feedback) under wet conditions, but depresses it (positive feedback) under very dry conditions. This switch in carbon-climate feedback direction arises mainly from scaling effects of warming-induced decreases in soil water content on net ecosystem productivity. This water scaling of warming effects offers generalizable mechanisms not only to help explain varying magnitudes and directions of observed carbon-climate feedback but also to improve model prediction of ecosystem carbon dynamics in response to climate change.
引用
收藏
页数:7
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