Research progresses in the effect of land-use change on soil carbon pools and soil respiration

Land use change has a very significant impact on the carbon cycling in ecosystems and global climate change. Soil carbon storage has the 2-3 times capacity of the atmospheric carbon pool，and the process of soil respiration is regarded as the main pathway to the emission of pedosphere carbon into the atmosphere. Study on the effects of land use change on soil carbon pools and soil respiration rate would have a very important significance for revealing the response of ecosystems to land-use change and associated mechanisms，and scientific estimates of regional ecosystem carbon sequestration. The effects of land-use change among four land-use types （natural woodland，plantation land，agricultural land and grassland） on the soil carbon storage were reviewed in this paper. The effects of the above-mentioned land-use change on different labile carbon pools，including microbial biomass carbon，water-soluble carbon，readily oxidizable C，were analyzed in detail. Additionally，the response of soil respiration rate to the land-use change and associated mechanisms was investigated，and the focuses in this field for future research were put forward.［Ch，69 ref.］