Journal
GLOBAL CHANGE BIOLOGY
Volume 24, Issue 9, Pages 4238-4250Publisher
WILEY
DOI: 10.1111/gcb.14281
Keywords
enzymatic activity; enzyme denaturation; enzyme trait; SOC decomposition under warming; temperature sensitivity
Funding
- INRA Meta Program ACCAF (project AWEST)
- Austrian Science Fund (FWF) [P28572] Funding Source: Austrian Science Fund (FWF)
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Most current models of soil C dynamics predict that climate warming will accelerate soil C mineralization, resulting in a long-term CO2 release and positive feedback to global warming. However, ecosystem warming experiments show that CO2 loss from warmed soils declines to control levels within a few years. Here, we explore the temperature dependence of enzymatic conversion of polymerized soil organic C (SOC) into assimilable compounds, which is presumed the rate-limiting step of SOC mineralization. Combining literature review, modelling and enzyme assays, we studied the effect of temperature on activity of enzymes considering their thermal inactivation and catalytic activity. We defined the catalytic power of enzymes (E-power) as the cumulative amount of degraded substrate by one unit of enzyme until its complete inactivation. We show a universal pattern of enzyme's thermodynamic properties: activation energy of catalytic activity (EA(cat))
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