Abstract:

Estimation on soil carbon pool in regional scale is an important project in research on soil carbon cycling of terrestrial ecosystem,which can supply sufficient data for evaluating soil carbon storage in national scale.Combined with GIS,this paper studied the storage of soil organic carbon,the SOC(soil organic carbon)density of different soil types and its distribution in Shanghai City,based on the second soil survey of Shanghai City.The result shows that the total soil organic carbon storage at 100 cm depth of Shanghai City is 576×107 t,accounting for 0062 6% of that of the country,and the mean of SOC density is 1055 kg/m2,higher than that of the country,which shows higher carbon sequestration in Shanghai City.In different soil types,paddy soil has the most storage of SOC,followed by calcareous alluvial soil and seashore saline soil.Yellow brown soil has the least storage of SOC because of its limited area.As for the SOC density of different soil types,its turn is as follows:paddy soil>calcareous alluvial soil>yellow brown soil>seashore saline.The spatial distribution of SOC density in Shanghai City is that the density of the west is higher than of the east,and in local range,the situation becomes complicated,which shows the influence of the terrain,microtopography,parent material,land use and landcover chang LUCC，et al.The net loss of SOC is 3924 4 Mt,due to the LUCC caused by rapid urbanization,corresponding to 986% of carbon emitted by fossil fuel in 2000,which indicates LUCC has become the major driving force influencing the SOC pool in rapidly urbanized region.〖