Long-term forest soil warming alters microbial communities in temperate forest soils

Frontiers in Microbiology
Kristen M DeAngelisSerita D Frey

Abstract

Soil microbes are major drivers of soil carbon cycling, yet we lack an understanding of how climate warming will affect microbial communities. Three ongoing field studies at the Harvard Forest Long-term Ecological Research (LTER) site (Petersham, MA) have warmed soils 5°C above ambient temperatures for 5, 8, and 20 years. We used this chronosequence to test the hypothesis that soil microbial communities have changed in response to chronic warming. Bacterial community composition was studied using Illumina sequencing of the 16S ribosomal RNA gene, and bacterial and fungal abundance were assessed using quantitative PCR. Only the 20-year warmed site exhibited significant change in bacterial community structure in the organic soil horizon, with no significant changes in the mineral soil. The dominant taxa, abundant at 0.1% or greater, represented 0.3% of the richness but nearly 50% of the observations (sequences). Individual members of the Actinobacteria, Alphaproteobacteria and Acidobacteria showed strong warming responses, with one Actinomycete decreasing from 4.5 to 1% relative abundance with warming. Ribosomal RNA copy number can obfuscate community profiles, but is also correlated with maximum growth rate or trophic strategy a...Continue Reading

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Citations

Jun 4, 2015·Proceedings of the National Academy of Sciences of the United States of America·Thomas W CrowtherMark A Bradford
Dec 24, 2015·Frontiers in Microbiology·Jürg B LogueJérôme Comte
Mar 26, 2016·Frontiers in Plant Science·Elham A Kazeeroni, Abdullah M Al-Sadi
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Datasets Mentioned

BETA
PRJNA242868

Methods Mentioned

BETA
PCR

Software Mentioned

indicspecies
ggplot2
limma
pamr
FastQC
METAGENassist
R
RStudio
pls
QIIME

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