Analysis on Soil Organic Carbon and Nutrients Storages in Different Forests in Ziwuling

By using the research method of field investigation,soil sampling and laboratory analysis,the soil organic carbon and nutrients storages for the three main forest types in Ziwuling have been discussed. The results are as follows:(1) The average soil organic carbon content for the three forest types is 3.9～37.6 g/kg,the soil organic carbon content in Quercus liaotungensis forest is highest but lowest in artificial P. tabulaeformis forest. Soil organic carbon contents generally decrease with the depth,and the variation in Pinus tabulaeformis f. shekannesis forest is highest (88.86%); (2) Soil carbon density in three forest types changed greatly,with an average of 1.06～3.53 kg/m2 for five soil layers,and decreased generally with the depth. For the whole soil profile(0-90 cm),soil carbon density in all forest types varied from 9.38 kg/m2 to 11.43 kg/m2; (3) The soil nutrient storages have different representations and relationship among the three forest types. There are trends on the decrease of soil organic carbon and total nutrients with soil depth,particularly the soil carbon and total nitrogen.