Variations Of Active Soil Organic Carbon Along A Soil Moisture Gradient In A Riparian Zone Of Taihu Lake.

The soil carbon cycle of inter-lands between the aquatic ecosystem and land terrestrial ecosystem such as the riparian zone is an important component of global carbon cycle. Along a soil moisture gradient in a riparian zone in Taihu lake, and using of random block experimental design, the active soil organic carbon along the moisture gradients, and the correlations among active soil organic carbon and soil physical and chemical factors were analyzed, in order to explore the specific processes concerning soil carbon cycle in wetlands, and lay a foundation for future study, by understanding its contribution and response to global climate change.The results revealed that the distribution pattern of WSOC and LFOC were very similar, decreasing along moisture gradients at surface 0-10cm.The amount of active soil organic carbon become smaller when the soil layers became deeper.In each site and different soil layers, WSOC and LFOC positively correlated with TOC, soil moisture, TN, respectively. Our research indicated that soil total organic carbon, total nitrogen and soil moisture might be the major factors controlling active soil organic carbon.Seasonal dynamics of WSOC and LFOC under the riparian zone were significantly. The concentration of WSOC in sping and summer was higher than those in autumn and winter generally. The overall trend of LFOC in the season showed the maximum value appeared in August, the minimum value appeared in November. The seasonal fluctuations in active soil organic carbon mainly were affected by seasonal change of soil temperature in the riparian zone.