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- Title
Gene-informed decomposition model predicts lower soil carbon loss due to persistent microbial adaptation to warming.
- Authors
Guo, Xue; Gao, Qun; Yuan, Mengting; Wang, Gangsheng; Zhou, Xishu; Feng, Jiajie; Shi, Zhou; Hale, Lauren; Wu, Linwei; Zhou, Aifen; Tian, Renmao; Liu, Feifei; Wu, Bo; Chen, Lijun; Jung, Chang Gyo; Niu, Shuli; Li, Dejun; Xu, Xia; Jiang, Lifen; Escalas, Arthur
- Abstract
Soil microbial respiration is an important source of uncertainty in projecting future climate and carbon (C) cycle feedbacks. However, its feedbacks to climate warming and underlying microbial mechanisms are still poorly understood. Here we show that the temperature sensitivity of soil microbial respiration (Q10) in a temperate grassland ecosystem persistently decreases by 12.0 ± 3.7% across 7 years of warming. Also, the shifts of microbial communities play critical roles in regulating thermal adaptation of soil respiration. Incorporating microbial functional gene abundance data into a microbially-enabled ecosystem model significantly improves the modeling performance of soil microbial respiration by 5–19%, and reduces model parametric uncertainty by 55–71%. In addition, modeling analyses show that the microbial thermal adaptation can lead to considerably less heterotrophic respiration (11.6 ± 7.5%), and hence less soil C loss. If such microbially mediated dampening effects occur generally across different spatial and temporal scales, the potential positive feedback of soil microbial respiration in response to climate warming may be less than previously predicted. Mechanisms and consequences of the acclimation of soil respiration to warming are unclear. Here, the authors combine soil respiration, metagenomics, and functional gene results from a 7-year grassland warming experiment to a microbial-enzyme decomposition model, showing functional gene information to lower uncertainty and improve fit.
- Subjects
SOIL erosion; SOIL respiration; CARBON in soils; HETEROTROPHIC respiration; MICROBIAL respiration; CARBON cycle; CLIMATE feedbacks; GRASSLAND soils
- Publication
Nature Communications, 2020, Vol 11, Issue 1, pN.PAG
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-020-18706-z