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Warming enhances old organic carbon decomposition through altering functional microbial communities

Journal Article · · The ISME Journal
 [1];  [2];  [3];  [2];  [3];  [3];  [3];  [3];  [3];  [3];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. Zhejian Univ., Hangzhou (China). Key Lab of Conservation Biology for Endangered Wildlife of the Ministry of Education; Univ. of Oklahoma, Norman, OK (United States). Dept. of Microbiology and Plant Biology, Inst. for Environmental Genomics
  2. Zhejian Univ., Hangzhou (China). Key Lab of Conservation Biology for Endangered Wildlife of the Ministry of Education
  3. Univ. of Oklahoma, Norman, OK (United States). Dept. of Microbiology and Plant Biology, Inst. for Environmental Genomics
  4. East China Normal Univ. (ECNU), Shanghai (China). Center ofr Global Change and Ecological Forecasting
  5. Univ. of Alaska, Fairbanks, AK (United States). Inst. of Arctic Biology
  6. Georgia Inst. of Technology, Atlanta, GA (United States). Center for Bioinformatics and Computational Genomics
  7. Northern Arizona Univ., Flagstaff, AZ (United States). Center for Ecoystem Science and Society
  8. Univ. of Oklahoma, Norman, OK (United States). Dept. of Microbiology and Plant Biology
  9. Michigan State Univ., East Lansing, MI (United States). Center for Microbial Ecology
  10. Univ. of Oklahoma, Norman, OK (United States). Dept. of Microbiology and Plant Biology, Inst. for Environmental Genomics, School of Civil Engineering and Environmental SCiences; Tsinghua Univ., Beijing (China). State Key Joint Lab. of Environment Simulation and Pollution Control; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth and Environmental Sciences

Soil organic matter (SOM) stocks contain nearly three times as much carbon (C) as the atmosphere and changes in soil C stocks may have a major impact on future atmospheric carbon dioxide concentrations and climate. Over the past two decades, much research has been devoted to examining the influence of warming on SOM decomposition in topsoil. Most SOM, however, is old and stored in subsoil. The fate of subsoil SOM under future warming remains highly uncertain. Here, by combining a long-term field warming experiment and a meta-analysis study, we showed that warming significantly increased SOM decomposition in subsoil. We also showed that a decade of warming promoted decomposition of subsoil SOM with turnover times of decades to millennia in a tall grass prairie and this effect was largely associated with shifts in the functional gene structure of microbial communities. By coupling stable isotope probing with metagenomics, we found that microbial communities in warmed soils possessed a higher relative abundance of key functional genes involved in the degradation of organic materials with varying recalcitrance than those in control soils. These findings suggest warming may considerably alter the stability of the vast pool of old SOM in subsoil, contributing to the long-term positive feedback between the C cycle and climate.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; SC0004601; SC0010715
OSTI ID:
1408455
Journal Information:
The ISME Journal, Journal Name: The ISME Journal Journal Issue: 8 Vol. 11; ISSN 1751-7362
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (13)

Contrasting Biogeographic Patterns of Bacterial and Archaeal Diversity in the Top- and Subsoils of Temperate Grasslands journal October 2019
The Role of Agriculture in Climate Change Mitigation—A Polish Example journal June 2021
Temporal and spatial succession and dynamics of soil fungal communities in restored grassland on the Loess Plateau in China journal March 2019
Organic carbon quality, composition of main microbial groups, enzyme activities, and temperature sensitivity of soil respiration of an acid paddy soil treated with biochar journal December 2018
Important interaction of chemicals, microbial biomass and dissolved substrates in the diel hysteresis loop of soil heterotrophic respiration journal May 2018
Mediterranean grassland soil C–N compound turnover is dependent on rainfall and depth, and is mediated by genomically divergent microorganisms journal May 2019
Above and belowground community strategies respond to different global change drivers journal February 2019
Different microbial responses in top‐ and sub‐soils to elevated temperature and substrate addition in a semiarid grassland on the Loess Plateau journal April 2019
Effects of climate warming on carbon fluxes in grasslands— A global meta‐analysis journal February 2019
Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland journal October 2019
Soil carbon loss with warming: New evidence from carbon‐degrading enzymes journal April 2020
Comment on “The whole-soil carbon flux in response to warming” journal February 2018
Above and belowground community strategies respond to different global change drivers text January 2019

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