Microbial Functional Genes Help Explain Soil Carbon Sensitivity to Temperature Across Global Biomes.

Authors

Tadeo Sáez-Sandino, Brajesh K Singh, Chao Xiong, Juntao Wang, Chengjie Ren, Manuel Delgado-Baquerizo

Published in

Global change biology. Volume 32. Issue 9. Pages e71101.

Abstract

The temperature sensitivity of soil microbial respiration (Q₁₀) is a major factor underpinning global soil carbon emissions under climate change. While microbial biomass is a key driver of Q₁₀ values, the role of microbial functional traits in explaining Q₁₀ values remains largely undetermined. Here, we combined temperature-gradient incubations with a metagenomic database generated from a collection of surface soils collected across 196 natural ecosystems spanning all major biomes. We found that microbial functional traits related to carbohydrate metabolism and hemicellulose degradation, quantified as transcripts-per-million (TPM), are significantly correlated with Q₁₀ values. Moreover, Q₁₀ values display abrupt non-linear shifts once thresholds of microbial functional traits are crossed. Global mapping further provides evidence that microbial functional traits associated with carbon degradation and high Q₁₀ values are concentrated within the planet's largest soil carbon reservoirs at high latitudes in the Northern Hemisphere. These regions could represent critical hotspots of vulnerability to soil carbon losses under climate warming. Our results provide a new step towards incorporating metagenomic data and non-linear microbial responses into next-generation carbon-climate models.

PMID:
42779148
Bibliographic data and abstract were imported from PubMed on 24 Sep 2026.

Read full publication at:
Please sign in to see all details.

Stats

1-terrible, 9-excellent. How would you rate this publication? Sign in in to submit your rating.

Post a comment

You need to be signed in to post comments. You can sign in here.

Comments

There are no comments yet.