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Updated: Mar 3, 2026

Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block
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Warming enhances old organic carbon decomposition through altering functional microbial communities.

Lei Cheng1,2,3, Naifang Zhang1, Mengting Yuan2,3

  • 1Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, College of Life Sciences, Zhejiang University, Hangzhou, China.

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Summary

Warming significantly increases soil organic matter decomposition in subsoil, impacting the carbon cycle. This study reveals how warming alters microbial communities, affecting the stability of old soil carbon stores.

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Area of Science:

  • Soil Science
  • Ecology
  • Climate Change Research

Background:

  • Soil organic matter (SOM) stores substantial carbon, influencing climate.
  • Research has focused on topsoil warming effects, leaving subsoil SOM fate uncertain.

Purpose of the Study:

  • To investigate the impact of warming on subsoil soil organic matter decomposition.
  • To understand the microbial mechanisms driving subsoil SOM changes under warming.

Main Methods:

  • A long-term field warming experiment was conducted.
  • A meta-analysis study was performed.
  • Stable isotope probing coupled with metagenomics analyzed microbial communities.

Main Results:

  • Warming significantly increased subsoil SOM decomposition over a decade.
  • Microbial communities in warmed soils showed increased abundance of genes for organic material degradation.
  • These changes were observed in a tall grass prairie ecosystem.

Conclusions:

  • Warming alters the stability of old subsoil SOM.
  • Subsoil SOM decomposition under warming may create a positive feedback loop with climate change.
  • Microbial functional gene structure is a key factor in subsoil carbon cycling.