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ORGANIC CARBON STORAGE IN SOIL UNDER THE MAJOR FOREST VEGETATION TYPES IN THE THREE GORGES RESERVIOR AREA

CHEN Liang-zhong~(1,2) XIE Bao-yuan~1 XIAO Wen-fa~2 HUANG Zhi-lin~2 (1.College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;2.Research Institute of Forest Ecology Environment and Protection,Chinese Academy of Forestry,Beijing 100091,China)  
Based on the data of forest inventory,the forest vegetation types of the Three Gorges Reservoir Area (TGRA) were divided into 11 types by its dominant tree species and acreages,such as Pinus massoniana forest,mixed forest of Quercus,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 Cunnighamia Lanceolata was the highest (16.0 kg/m~2),and that of the forest of Pinus arrnaridii or Pinusbenryi 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 Cupessus funebris 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 Cunnighamia Lanceolata was the largest (98.5cm),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 and40 cm soil depth interval, respectively.
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