Abstract: In order to further clarify the law of soil carbon cycling in Chongming Island, 1m depth soil organic carbon survey of 5 planting types (cropland, vegetable field, orchard, forest and wetland) was conducted. Based on geostatistics methods, the spatial distribution feature of deep soil organic carbon content in Chongming Island were investigated, and the effects of different planting types on the soil organic carbon distribution and storage were also studied. The results showed that the average deep soil organic carbon content of Chongming Island was 3.94g·kg-1. The range of soil organic carbon content in different depths was 8.73-1.72g·kg-1, and the range of soil organic carbon storage was 2.30-0.47×106 t. The soil organic carbon storage of plough layer (0-40cm) accounted for 65.14% of the total amount. The maps of soil organic carbon content distribution of different depths (0-20, 20-40, 40-60, 60-80 and 80-100cm) were drawn. The feature of organic carbon content distribution in different soil depths were similar with each other, except that under the depth of 60cm, soil organic carbon content in the wetland was higher than the other planting types. There were significant effects of different planting types on the soil organic carbon distribution. The sequence of soil organic carbon density was vegetable field＞cropland＞orchard＞forest＞wetland, and the sequence of soil organic carbon storage was cropland＞ wetland＞forest＞vegetable field＞orchard.

Key words: Chongming Island, 1m depth soil, Map of spatial distribution, Geo-statistics analysis, Planting types