Feedbacks of Soil Heterotrophic Respiration to Global Warming
The acceleration of global warming due to soil heterotrophic respiration (SHR) feedbacks may be potentially important mechanisms which have significant effects on global carbon budgets. Most of studies suggest that SHR rates exponentially increase with increasing temperature, thus providing a dangerous positive feedback to global warming. However, it is difficult to estimate how strong the positive feedback is because there is no consensus on the temperature sensitivity of decomposition of different soil organic matter fractions now. Moreover, SHR could acclimate to high temperature, which may mitigate the positive feedback effects. By now, it has involved three hypotheses including the soil water constraint hypothesis, the microorganism acclimation hypothesis and the respiratory substrate constraint hypothesis to explain the phenomena of acclimation. Finally, four research priorities are provided to enhance the understanding of feedbacks of SHR to global warming.
国家科技期刊平台
NSTL
万方数据
维普
