Soil Organic Carbon Storage and Nutrients Pools of Several Forest Types in Typical Area of Hanjiang River Basin

By using the research method of field investigation,soil sampling and laboratory analysis,the soil organic carbon storage and nutrients pools for the four main forest types in typical area of Hanjiang River Basin have been discussed.The results are as follow:(1) The average soil organic carbon content for the four forest types is 8.48g.kg-1-11.93g.kg-1,the soil organic carbon content in evergreen broad-leaved forest is highest but lowest in eucalypt forest.Soil organic carbon contents generally decrease with depth,and the variation in broad-leaved forest is highest(72.35﹪).(2) Soil carbon density in the four forest types change greatly,with a average of 1.78 kg.m-2-5.74 kg.m-2 for five soil depth intervals.Soil carbon density decrease generally with the depth,too.For the whole soil section,soil carbon density in all forest types varies from 13.41 kg.m-2 to16.74 kg.m-2.(3) The soil nutrients pools have different representations among the four forest types.There are trends of soil organic carbon and total nutrients decreased with soil depth,particularly the soil carbon and total nitrogen.