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3 results for “substrate availability”
Apparent thermal acclimation of soil heterotrophic respiration mainly mediated by substrate availability
<p><span>Multiple lines of existing evidence suggest that increasing CO<sub>2</sub> emission from soils</span> <span>in response to rising temperatures could accelerate global warming. However, in experimental studies, the initial positive response of soil heterotrophic respiration (</span><span>R</span><sub><span>H</span></sub><span>) to</span><span> warming often weakens over time (referred to apparent thermal acclimation). If the</span><span> decreased </span><span>R</span><span>H</span> <span>is driven by</span><span> the thermal adaptation of soil microbial community, the potential for soil carbon (C) losses would be reduced substantially. In the meanwhile, the response could </span><span>equally be caused by substrate depletion, and would then </span><span>reflect the gradual loss of soil C.</span> <span>To address uncertainties regarding the causes of apparent thermal acclimation, we carried out </span><span>sterilization and inoculation</span><span> experiments using the soil samples from an alpine meadow with 6-years of warming and nitrogen (N) addition. We demonstrate</span><span> that substrate depletion, rather than microbial adaptation, determined the response of R<sub>H</sub> to long-term warming. Furthermore, </span><span>N addition appeared to alleviate the apparent acclimation of </span><span>R</span><sub><span>H</span></sub><span> to warming. Our study provides strong empirical support for </span><span>substrate availability being the cause of the </span><span>apparent acclimation of soil </span><span>microbial respiration to temperature. Thus, t</span><span>hese mechanistic insights</span><span> could</span><span> facilitate efforts of biogeochemical modeling to accurately project soil C stocks in the future climate.</span></p>
Apparent thermal acclimation of soil heterotrophic respiration mainly mediated by substrate availability
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Exercise prevents fatty liver by modifying the compensatory response of mitochondrial metabolism to excess substrate availability
GEO Series GSE167046. Mus musculus. 29 samples. Type: Expression profiling by array.
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