Recent Photosynthates Are the Primary Carbon Source for Soil Microbial Respiration in Subtropical Forests

Zhijie Yang, Teng Chiu Lin*, Lixin Wang, Shidong Chen, Xiaofei Liu, Decheng Xiong, Chao Xu, Mary Arthur, Rebecca McCulley, Sihong Shi, Yusheng Yang*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

5 引文 斯高帕斯(Scopus)

摘要

Tropical and subtropical forests represent the largest terrestrial carbon pool. Elucidating the carbon sources for soil microbial respiration (Rm) in tropical and subtropical forests is of fundamental importance to the global carbon cycle in a warming world. Based on hourly measurements, we quantified Rm of in situ forest soil and soil cores from a subtropical forest. We found recent photosynthates, not soil organic carbon (SOC), contributed 88% ± 12% of the carbon source fueling Rm. The control of recent photosynthates on Rm is also supported by the close relationship between Rm and photosynthetically active radiation as well as literature data synthesis results. These results challenge conventional models based on the tenet that Rm is mainly regulated by soil temperature in all forest ecosystems. The results imply that the widely observed warming-induced Rm increases are largely explained by the enhanced input of recent photosynthates in tropical forests, not SOC consumption.

原文英語
文章編號e2022GL101147
期刊Geophysical Research Letters
49
發行號22
DOIs
出版狀態已發佈 - 2022 11月 28

ASJC Scopus subject areas

  • 地球物理
  • 一般地球與行星科學

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