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Rhizosphere influence on microbial functions: consequence for temperature sensitivity of soil organic matter decomposition at early stage of plant growth
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Rhizosphere influence on microbial functions: consequence for temperature sensitivity of soil organic matter decomposition at early stage of plant growth
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Journal Article
Rhizosphere influence on microbial functions: consequence for temperature sensitivity of soil organic matter decomposition at early stage of plant growth
2024
Overview
Aims
Accurate predictions of soil carbon (C) feedbacks to climate change depend on an improved understanding of temperature sensitivity (Q
10
) of soil organic matter (SOM) decomposition. Although rhizosphere processes play a critical role in SOM decomposition, the rhizosphere effects on Q
10
and their underlying microbial mechanisms remain unclear.
Methods
Natural abundance approach was used to measure the rhizosphere priming effect (RPE) of maize under two temperature regimes in a 50-day pot experiment. We further determined the impact of rhizosphere process on the Q
10
of SOM decomposition. Enzymatic kinetics, microbial growth rate, as well as
13
C-phospholipid fatty acid (
13
C-PLFA) biomarkers were identified to evaluate the responses of microbial activity.
Results
Warming relative to ambient increased the plant-derived C input, stimulated microbial growth rate, and enzyme activities by 87%, 23%, and 7–18%, respectively. Consequently, warming increased the RPE of maize up to 1-folds, and further caused a larger net C loss as compared to ambient after 50 days of transplanting. Gram negative bacteria and actinobacteria were important groups controlling the RPE, which was supported by the positive correlations between RPE and the abundance of gram negative and actinobacteria. Furthermore, we concluded a literature review and the results were consistent with our case study, where the presence of roots increased the temperature sensitivity of SOM decomposition by 0.17–0.56. This was because rhizodeposition activated microorganisms which produce more enzymes and increase SOM-derived substrate availability. This indicates that planted soils face higher risks of C emissions under future climate warming.
Conclusions
Overall, root-soil interactions via RPE play a pivotal role in determining the temperature sensitivity of SOM decomposition.
