Tundra microbial community taxa and traits predict decomposition parameters of stable, old soil organic carbon

The ISME Journal
Lauren HaleJizhong Zhou

Abstract

The susceptibility of soil organic carbon (SOC) in tundra to microbial decomposition under warmer climate scenarios potentially threatens a massive positive feedback to climate change, but the underlying mechanisms of stable SOC decomposition remain elusive. Herein, Alaskan tundra soils from three depths (a fibric O horizon with litter and course roots, an O horizon with decomposing litter and roots, and a mineral-organic mix, laying just above the permafrost) were incubated. Resulting respiration data were assimilated into a 3-pool model to derive decomposition kinetic parameters for fast, slow, and passive SOC pools. Bacterial, archaeal, and fungal taxa and microbial functional genes were profiled throughout the 3-year incubation. Correlation analyses and a Random Forest approach revealed associations between model parameters and microbial community profiles, taxa, and traits. There were more associations between the microbial community data and the SOC decomposition parameters of slow and passive SOC pools than those of the fast SOC pool. Also, microbial community profiles were better predictors of model parameters in deeper soils, which had higher mineral contents and relatively greater quantities of old SOC than in surface...Continue Reading

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Citations

Nov 13, 2020·Journal of Hazardous Materials·Xiaowen JiXianchuan Xie
May 17, 2021·Journal of Environmental Management·Tingting SunWenting Feng
Jun 17, 2021·Proceedings of the National Academy of Sciences of the United States of America·Ming-Hui WuYan-Fen Wang

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Datasets Mentioned

BETA
PRJNA522791
11234070

Methods Mentioned

BETA
PCR

Software Mentioned

Forest
ANOSIM
Random Forest
Random
MRM
GeoChip

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