摘要
Soil respiration, which is primarily the only output approach for CO2 exchanges in soils between the global terrestrial ecosystem and the atmosphere,exerts a direct influence on the speed of carbon turnover rate of the soil. On a global scale, soil respiration from terrestrial ecosystems is more than 10 times of the CO2 released from fossil fuel combustion and the reservoir of soil organic carbon in the terrestrial ecosystems is almost three times that of atmospheric carbon reservoir, a subtle change in soil respiration in response to environmental change might produce marked impacts on global carbon budget and the atmospheric CO2 concentration. In light of the increasing trend of global warming, the changes in global land use and land cover approaches might weaken the carbon sink capacity of a terrestrial ecosystem as well as enhance soil respiratory intensity at the same time. In contrast, the terrestrial ecosystem carbon sink capacity would be upgraded if proper policy is adopted for carbon management of the terrestrial ecosystem and the relevant technologies for enhancing the carbon sink are introduced. It is more important to understand the biogenic and environmental process of soil respiration to evaluate the global carbon budget.
