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Microbial traits determine soil C emission in response to fresh carbon inputs in forests across biomes

Authors :
Chengjie Ren
Jun Wang
Felipe Bastida
Xinhui Han
Sha Zhou
Zhenghu Zhou
Gaihe Yang
Manuel Delgado-Baquerizo
Jieying Wang
Yaoxin Guo
Fazhu Zhao
Shuohong Zhang
Zekun Zhong
Yuanhe Yang
Gehong Wei
National Natural Science Foundation of China
Chinese Academy of Sciences
Shaanxi Province
Ministry of Science and Technology of the People's Republic of China
Qinghai Province
Consejo Superior de Investigaciones Científicas (España)
Ministerio de Ciencia e Innovación (España)
Agencia Estatal de Investigación (España)
Source :
Digital.CSIC. Repositorio Institucional del CSIC, instname
Publication Year :
2021
Publisher :
Wiley, 2021.

Abstract

Soil priming is a microbial-driven process, which determines key soil–climate feedbacks in response to fresh carbon inputs. Despite its importance, the microbial traits behind this process are largely undetermined. Knowledge of the role of these traits is integral to advance our understanding of how soil microbes regulate carbon (C) emissions in forests, which support the largest soil carbon stocks globally. Using metagenomic sequencing and C-glucose, we provide unprecedented evidence that microbial traits explain a unique portion of the variation in soil priming across forest biomes from tropical to cold temperature regions. We show that microbial functional profiles associated with the degradation of labile C, especially rapid simple sugar metabolism, drive soil priming in different forests. Genes involved in the degradation of lignin and aromatic compounds were negatively associated with priming effects in temperate forests, whereas the highest level of soil priming was associated with β-glucosidase genes in tropical/subtropical forests. Moreover, we reconstructed, for the first time, 42 whole bacterial genomes associated with the soil priming effect and found that these organisms support important gene machinery involved in priming effect. Collectively, our work demonstrates the importance of microbial traits to explain soil priming across forest biomes and suggests that rapid carbon metabolism is responsible for priming effects in forests. This knowledge is important because it advances our understanding on the microbial mechanisms mediating soil–climate feedbacks at a continental scale.<br />This work were financially supported by the National Natural Science Foundation of China (41907031), the Chinese Academy of Sciences “Light of West China” Program for Introduced Talent in the West, the National Natural Science Foundation of China (31570440, 31270484), the Key International Scientific and Technological Cooperation and Exchange Project of Shaanxi Province, China (2020KWZ-010), the 2021 First Funds for Central Government to Guide Local Science and Technology Development in Qinghai Province (2021ZY002), the i-LINK +2018 (LINKA20069) from CSIC, and a Ramón y Cajal grant from the Spanish Ministry of Science and Innovation (RYC2018-025483-I)

Details

ISSN :
13652486 and 13541013
Volume :
28
Database :
OpenAIRE
Journal :
Global Change Biology
Accession number :
edsair.doi.dedup.....e9b40377a79e2c6834fff929f199cd8c
Full Text :
https://doi.org/10.1111/gcb.16004