Soil Organic Carbon Density and Storage in Different Forest Types in Mid-subtropical Zone

Soil organic carbon(SOC)density and carbon storage and related regulations of 4 forest types were studied in Lingyan Mountain of Sichuan province situated in mid-subtropical zone.The result showed that there were signifi-cant differences among SOC content and density from the 4 forest types and different soil layers.The vertical distribu-tion varied with soil depth.SOC content and density in Cryptomeria fortunei,Ginkgo biloba,Cunninghamia lanceolata + Camptotheca acuminata mixed forest and Phoebe zhennan forest were 12.26g/kg and 15.59kg/m2,12.40g/kg and 15.20kg/m2,11.88g/kg and 15.03 kg/m2,9.33g/kg and 8.11kg/m2.The carbon storage of the 4 forestlands was huge,average 134.83t/hm2.The result indicated that SOC in Lingyan Mountain was abundant but had significant difference among stands.SOC content had evident close relation with total nitrogen,and the linear regression was well fitting,means that soil carbon storage had close relation with nitrogen.