Water scaling of ecosystem carbon cycle feedback to climate warming.

ABSTRACT: 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 ecos

SUBMITTER: Quan Q 

PROVIDER: S-EPMC6703863 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature