Enhanced causal effect of ecosystem photosynthesis on respiration during heatwaves

Jiaye Ping, Erqian Cui, Ying Du, Ning Wei, Jian Zhou, Jing Wang, Shuli Niu, Yiqi Luo, Jianyang Xia

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Because of global warming, Earth’s ecosystems have been experiencing more frequent and severe heatwaves. Heatwaves are expected to tip terrestrial carbon sequestration by elevating ecosystem respiration and suppressing gross primary productivity (GPP). Here, using the convergent cross-mapping technique, this study detected positive bidirectional causal effects between GPP and respiration in two unprecedented European heatwaves. Heatwaves enhanced the causal effect strength of GPP on respiration rather than respiration on GPP across 40 site-years of observations. Further analyses and global simulations revealed spatial heterogeneity in the heatwave response of the causal link strength between GPP and respiration, which was jointly driven by the local climate and vegetation properties. However, the causal effect strength of GPP on respiration showed considerable uncertainties in CMIP6 models. This study reveals an enhanced causal link strength between GPP and respiration during heatwaves, shedding light on improving projections for terrestrial carbon sink dynamics under future climate extremes.

Original languageEnglish (US)
Article numberadi6395
JournalScience Advances
Volume9
Issue number43
DOIs
StatePublished - 2023
Externally publishedYes

ASJC Scopus subject areas

  • General

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