Elevated CO2 and Warming Altered Grassland Microbial Communities in Soil Top-Layers

Frontiers in Microbiology
Hao YuJizhong Zhou

Abstract

As two central issues of global climate change, the continuous increase of both atmospheric CO2 concentrations and global temperature has profound effects on various terrestrial ecosystems. Microbial communities play pivotal roles in these ecosystems by responding to environmental changes through regulation of soil biogeochemical processes. However, little is known about the effect of elevated CO2 (eCO2) and global warming on soil microbial communities, especially in semiarid zones. We used a functional gene array (GeoChip 3.0) to measure the functional gene composition, structure, and metabolic potential of soil microbial communities under warming, eCO2, and eCO2 + warming conditions in a semiarid grassland. The results showed that the composition and structure of microbial communities was dramatically altered by multiple climate factors, including elevated CO2 and increased temperature. Key functional genes, those involved in carbon (C) degradation and fixation, methane metabolism, nitrogen (N) fixation, denitrification and N mineralization, were all stimulated under eCO2, while those genes involved in denitrification and ammonification were inhibited under warming alone. The interaction effects of eCO2 and warming on soil fu...Continue Reading

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Citations

Oct 6, 2019·Nature Reviews. Microbiology·Janet K Jansson, Kirsten S Hofmockel
Sep 21, 2021·Global Change Biology·Yuqi ZhouYe Deng

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Methods Mentioned

BETA
gene array

Software Mentioned

Vegan Agricolae
GeoChip
ImaGene
PHACE
R
Adonis

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