Acclimatization of soil respiration to warming
土壤呼吸对温度升高的适应

Soil respiration is an important component of carbon cycle of terrestrial ecosystem, and is usually driven by temperature. Feedback between carbon cycle and global climate change is mostly determined by the sensitivity of soil respiration to warming.. The sensitivity of soil respiration to warming declines when temperature continually increases, or warming keeps much longer, which is a common phenomenon known as acclimatization. Main mechanisms involve transfer between dominant factors and change of other factors with temperature. There are many factors other than temperature that could impose different effects on soil respiration under certain temperatures, such as water content, soil nutrient, roots, soil microorganism, etc.,, which could play dominant roles when temperature is high enough. Those factors usually change with temperature, e.g. when temperature increases or warming continues for a prolonged time, soil might become dryer, labile carbon might be decreased, activity of enzyme related to respiration of soil microorganism and roots might be reduced, allocation of photosynthetic production to belowground might be depressed. Acclimatization of soil respiration is a negative feedback of carbon cycle to global warming, which could mitigate the coupling of terrestrial ecosystem and global climate, i.e., CO_2 efflux from soil stimulated by warming would be restricted by the acclimatization in some degree. Because of acclimatization of soil respiration to warming, CO_2 flux from soil responding to global climate change is likely to be complex and highly variable spatially and temporally. Modeling is a necessary approach for predicting or simulating how ecosystem responds to climate change, but most of the currently used models do not take into account of the sensitivity of soil respiration to temperature. A fixed Q_(10) might result in large errors or biases when predicting CO_2 flux from soil and future climate conditions.