AI Article Synopsis
- Extracellular enzymes, like cellulase and ligninase, are essential for breaking down soil organic matter and influence soil respiration (SR), which is sensitive to temperature changes.
- A meta-analysis of 56 studies found that warming increases ligninase activity by 21.4% but does not affect cellulase activity, with increased ligninase being positively correlated to SR.
- The study suggests that as temperatures rise, soil microorganisms may enhance long-term SR by more effectively decomposing resistant carbon compounds through increased ligninase activity, especially over extended experimental durations.
Article Abstract
Extracellular enzymes catalyze rate-limiting steps in soil organic matter decomposition, and their activities (EEAs) play a key role in determining soil respiration (SR). Both EEAs and SR are highly sensitive to temperature, but their responses to climate warming remain poorly understood. Here, we present a meta-analysis on the response of soil cellulase and ligninase activities and SR to warming, synthesizing data from 56 studies. We found that warming significantly enhanced ligninase activity by 21.4% but had no effect on cellulase activity. Increases in ligninase activity were positively correlated with changes in SR, while no such relationship was found for cellulase. The warming response of ligninase activity was more closely related to the responses of SR than a wide range of environmental and experimental methodological factors. Furthermore, warming effects on ligninase activity increased with experiment duration. These results suggest that soil microorganisms sustain long-term increases in SR with warming by gradually increasing the degradation of the recalcitrant carbon pool.
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| http://dx.doi.org/10.1111/gcb.14394 | DOI Listing |
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