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3324969 
Journal Article 
Soil respiration under climate warming: differential response of heterotrophic and autotrophic respiration 
Wang, Xin; Liu, L; Piao, S; Janssens, IA; Tang, J; Liu, W; Chi, Y; Wang, J; Xu, S 
2014 
Yes 
Global Change Biology
ISSN: 1354-1013
EISSN: 1365-2486 
20 
10 
3229-3237 
English 
24771521 
WOS:000342168500019 
Despite decades of research, how climate warming alters the global flux of soil respiration is still poorly characterized. Here, we use meta-analysis to synthesize 202 soil respiration datasets from 50 ecosystem warming experiments across multiple terrestrial ecosystems. We found that, on average, warming by 2 degrees C increased soil respiration by 12% during the early warming years, but warming-induced drought partially offset this effect. More significantly, the two components of soil respiration, heterotrophic respiration and autotrophic respiration showed distinct responses. The warming effect on autotrophic respiration was not statistically detectable during the early warming years, but nonetheless decreased with treatment duration. In contrast, warming by 2 degrees C increased heterotrophic respiration by an average of 21%, and this stimulation remained stable over the warming duration. This result challenged the assumption that microbial activity would acclimate to the rising temperature. Together, our findings demonstrate that distinguishing heterotrophic respiration and autotrophic respiration would allow us better understand and predict the long-term response of soil respiration to warming. The dependence of soil respiration on soil moisture condition also underscores the importance of incorporating warming-induced soil hydrological changes when modeling soil respiration under climate change. 
acclimation; apparent Q10; ecosystem warming; forest; grassland; mediterranean; meta-analysis; soil moisture; tundra; warming duration