Winter warming in Alaska accelerates lignin decomposition contributed by Proteobacteria

Tao, Xuanyu; Feng, Jiajie; Yang, Yunfeng; Wang, Gangsheng; Tian, Renmao; Fan, Fenliang; Ning, Daliang; Bates, Colin T.; Hale, Lauren; Yuan, Mengting M.; Wu, Linwei; Gao, Qun; Lei, Jiesi; Schuur, Edward A. G.; Yu, Julian; Bracho, Rosvel; Luo, Yiqi; Konstantinidis, Konstantinos T.; Johnston, Eric R.; Cole, James R.; Penton, C. Ryan; Tiedje, James M.; Zhou, Jizhong

doi:10.1186/s40168-020-00838-5

Winter warming in Alaska accelerates lignin decomposition contributed by Proteobacteria

Journal Article · Fri Jun 05 00:00:00 EDT 2020 · Microbiome

DOI:https://doi.org/10.1186/s40168-020-00838-5· OSTI ID:1632050

Tao, Xuanyu; Feng, Jiajie; Yang, Yunfeng; Wang, Gangsheng; Tian, Renmao; Fan, Fenliang; Ning, Daliang; Bates, Colin T.; Hale, Lauren; Yuan, Mengting M.; Wu, Linwei; Gao, Qun; Lei, Jiesi; Schuur, Edward A. G.; Yu, Julian; Bracho, Rosvel; Luo, Yiqi; Konstantinidis, Konstantinos T.; Johnston, Eric R.; Cole, James R. more »

Background: In a warmer world, microbial decomposition of previously frozen organic carbon (C) is one of the most likely positive climate feedbacks of permafrost regions to the atmosphere. However, mechanistic understanding of microbial mediation on chemically recalcitrant C instability is limited; thus, it is crucial to identify and evaluate active decomposers of chemically recalcitrant C, which is essential for predicting C-cycle feedbacks and their relative strength of influence on climate change. Using stable isotope probing of the active layer of Arctic tundra soils after depleting soil labile C through a 975-day laboratory incubation, the identity of microbial decomposers of lignin and, their responses to warming were revealed. Results: The β-Proteobacteria genus Burkholderia accounted for 95.1% of total abundance of potential lignin decomposers. Consistently, Burkholderia isolated from our tundra soils could grow with lignin as the sole C source. A 2.2 °C increase of warming considerably increased total abundance and functional capacities of all potential lignin decomposers. In addition to Burkholderia, α-Proteobacteria capable of lignin decomposition (e.g. Bradyrhizobium and Methylobacterium genera) were stimulated by warming by 82-fold. Those community changes collectively doubled the priming effect, i.e., decomposition of existing C after fresh C input to soil. Consequently, warming aggravates soil C instability, as verified by microbially enabled climate-C modeling. Conclusions: Our findings are alarming, which demonstrate that accelerated C decomposition under warming conditions will make tundra soils a larger biospheric C source than anticipated.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231; SC0004601; SC0010715

OSTI ID:: 1632050

Alternate ID(s):: OSTI ID: 1695732

Journal Information:: Microbiome, Journal Name: Microbiome Journal Issue: 1 Vol. 8; ISSN 2049-2618

Publisher:: BioMed CentralCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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