Dynamics of Forest Soil Organic Carbon during Decomposition in Liping County

Soil organic carbon (SOC) has been showed as one of the largest and most mobile carbon pools of the earth surface ecosystem. For the last decade, increasing attention has been given to the dynamics of soil organic carbon in relation to the research of global soil organic carbon under global change scenarios. This paper studied dynamics of different forest soil organic carbon by incubation under controlled condition. The results showed that soil organic carbon content in the upper layer was evidently larger than that in the lower layer. We also found that different forest types had an important effect on soil organic carbon, especially on the upper layer. From incubation data for 61 days, total loss of soil organic carbon was emission of CO_2, about 200～400mg/kg. From decomposition curve of soil organic carbon in different vegetation, the trend of turnover rate is similar that the decomposition rate is faster in beginning and then becomes slower. The content of decomposition accounts to percent 37%～41% in seven days of beginning in incubation of 61 days. But decomposition of soil from different vegetation varies with incubation days. The trend of decomposition rate is respectively shrubs, broadleaf, conifer and Phyllostostachys pubescens.