Advances in Earth Science
• Articles •
Chen Qingqiang，Shen Chengde，Yi Weixi，Peng Shaolin，Li Zhian. PROGRESSES IN SOIL CARBON CYCLE RESEARCHES[J]. Advances in Earth Science, 1998, 13(6): 555-563.
Soil carbon is the main part of terrestrial carbon pool, and the total amount of soil organic carbon is about 1 270 Gt C globally. Climate changes influence plant production and decomposition rate of plant debris in/on soils, which contributes to the alterations of carbon fluxes between soils and the atmosphere, and can make great impacts on concentration of atmospheric CO2. Soil organic matter model is the only practical tool for the carbon cycle researches at ecosystem level, many kinds of which have been developed up to now. A great number of studies suggest that 14C measurement is an important method for the research on constitution of soil organic carbon and residual times of different components, soil organic carbon is composed of a series of components with different residual times. Grain size, mineral composition and soil texture are the main characteristics of soils controlling the amount and occurring states of soil organic carbon, and exert great impacts on the turnover of soil carbon with long residual times. Studies on the amount and dynamics of soil organic carbon could provide valuable theoretical bases for the predictions about alterations of agricultural and forest ecosystems under the influences of global changes.