Abstract:

Based on the data of forest inventory，the forest vegetation types of the Three Gorges Reservoir 〖JP2〗Area (TGRA) were divided into 11 types by its dominant tree species and acreages，such as 〖WTBX〗Pinus massoniana〖WTBZ〗〖JP〗 forest，mixed forest of 〖WTBX〗Quercus〖WTBZ〗，and shrubs etc.In this paper，the concentration，density and distribution of soil organic carbon (SOC) were studied based on 196 soil profiles.The results were as follows：the concentrations and densities of SOC under 11 forest of vegetation types were significantly different and generally decreased with depth;the density of SOC of forest of 〖WTBX〗Cunnighamia Lanceolata〖WTBZ〗 was the highest (16.0 kg/m2)，and that of the forest of 〖WTBX〗Pinus armaridii 〖WTBZ〗or〖WTBX〗 Pinusbenryi〖WTBZ〗 was the lowest (7.9 kg/m2)，among 11 vegetation types;the SOC storages of different soil layers under different vegetations were also different;the differences of carbon storage between soil layers under shrubs and forest of 〖WTBX〗Cupessus funebris〖WTBZ〗 was larger than that under other vegetation types;the average soil thickness of 11 forest of vegetation types was 56.3～98.5 cm，the soil thickness of forest of 〖WTBX〗Cunnighamia Lanceolata〖WTBZ〗 was the largest (98.5 cm)，and that of shrubs was the smallest (56.3 cm);the total acreage of 11 main forest vegetation types in the TGRA was 3 313 251 hm2，and the total storage of SOC under those vegetation types was 366.36 t，with 22.90%，18.36%，28.33% and 30.41% in 0～10，10～20，20～40 and ＞40 cm soil depth interval，respectively

Key words: concentration of SOC, soil carbon density, carbon storage, main forest vegetation types, Three Gorges Reservoir Area