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The sensitive evaluation indicators of effects of land-use change on soil carbon pool

ZHANG Jin-bo, SONG Chang-chun Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Scienses, Changchun 130012, China  
In this article, we reviewed the latest studies of the sensitive evaluation indicator of effects of land-use change on the soil carbon pool, including the microbial biomass carbon and microbial quotient, CO2 flux and qCO2, light fraction organic matter and particulate organic matter, and dissolved organic carbon. A lot of studies showed that the microbial biomass carbon pool, comparing to the total soil organic carbon, had greater turnover rate and shorter turnover time, and could be inspected before the total soil organic carbon could. Light fraction organic matter and particulate organic matter are determinants to nature soil fertility and more influenced by management practices than total SOM. So light fraction organic matter and particulate organic matter are sensitive evaluation indicators accurately evaluating effects of land-use change on the soil carbon pool. CO2 flux and qCO2 could synthetically show the microbial activity, efficiency of carbon availability and metabolize carbon of soil microorganism, and are sensitive indicators of soil carbon dynamic. DOC fluxes are 1~2 orders of magnitude smaller than the global transfer of the carbon between vegetation and atmosphere, so small changes in the carbon balance of the biosphere could result in large changes in DOC export. DOC concentrations and flux are sensitive to changes in temperature and moisture conditions in soil.
【Fund】: 中国科学院知识创新工程重大项目(KZCX1-SW-01)
【CateGory Index】: X14
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