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Simulating Temperature in a Soil Incubation Experiment
Published on: October 28, 2022
Does declining carbon-use efficiency explain thermal acclimation of soil respiration with warming?
Colin L Tucker1, Jennifer Bell, Elise Pendall
1Department of Botany, University of Wyoming, 3165, 1000 E. University Avenue, Laramie, WY, 82071, USA. ctucker4@uwyo.edu
Global Change Biology
|March 19, 2013
Summary
Global warming enhances soil respiration, increasing atmospheric CO2. Acclimation mechanisms, involving substrate depletion and microbial biomass changes, influence this response and soil carbon storage.
Area of Science:
- Soil science
- Ecology
- Biogeochemistry
Background:
- Global warming can enhance soil respiration, potentially increasing atmospheric CO2 levels.
- Understanding the temperature sensitivity of soil respiration is crucial for predicting climate change impacts.
Purpose of the Study:
- To investigate short-term and seasonal responses of soil respiration to temperature and substrate availability.
- To test hypotheses regarding thermal acclimation of soil respiration, specifically substrate depletion versus physiological acclimation.
Main Methods:
- Laboratory incubations of soil samples under varying thermal conditions and substrate availability.
- Development and application of a novel process-based model within a hierarchical Bayesian framework.
- Incorporation of Michaelis-Menten kinetics for substrate/microbial biomass and Arrhenius function for temperature response.
Main Results:
- Short-term acclimation of soil respiration is driven by both labile substrate depletion and decreasing microbial biomass carbon (MBC).
- Lower MBC at warmer temperatures is linked to reduced carbon-use efficiency (CUE).
- Seasonal acclimation involves higher CUE and lower basal respiration in summer-collected soils compared to winter-collected soils.
Conclusions:
- Substrate depletion and changes in microbial biomass/CUE are key to understanding soil respiration's response to warming.
- The balance between short-term CUE decreases and seasonal CUE acclimation will significantly impact long-term soil organic carbon storage.
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