The Distribution Characteristics of Soil Carbon,Nitrogen and Phosphorus Under Different Land Use patterns in Caohai Plateau Wetland

Through the comparative analysis of the surface soil under different land use patterns and the contents of soil organic carbon,soil total nitrogen,soil total phosphorus,soil available phosphorus,soil alkali solution nitrogen of lake sediment,andcombined with the effect of different seasons on soil carbon,nitrogen,phosphorus of sediment to explore the effect of human disturbance on soil carbon,nitrogen and phosphorus.The results indicated that:The order of distribution of soil total organic carbon and soil total nitrogen in Caohai plateau wetland was sedimentmarsh grass soilagricultural landforest land.The order of distribution of soil alkali solution nitrogen was sedimentagricultural landmarsh grass soilforest land.The order of distribution of soil total phosphorus and soil available phosphorus was agricultural landsedimentmarsh grass soilforest land.Soil total organic carbon,total nitrogen and alkali solution nitrogen had the obvious difference in different geographical position in sediment,but had the same distribution rule,SNE.The content of soil total organic carbon and soil total nitrogen from the shore had a trend of increasing.Soil C/N,C/P,N/P were influenced by the respective proportion of elements,also regulated by soil pH,soil bulk density and other factors.