It is helpful to understand the nutrient status by ascertaining stoichiometric characteristics of the litter and soil of water conservation forests in the rocky desertification area.In this paper,the forests of Pinus yunnanensis,Betula luminifera and Populus alba,Quercus variabilis and Corylus heterophylla,Populus alba and Betula luminifera,Rhododendron simsii and Populus alba and Betula luminifera in the karst plateau mountainous were used to study the organic C,TN,TP stoichiometry and intrinsic association of litter and soil.The results show that soil organic C,TN and TP in Karst communities occurred primarily in the top 0~20 cm soil layer,at 25.02 mg/g C,1.56 mg/g N and 0.33 mg/g P,with ratios of 15.13 for C:N,78.40 for C:P and 5.17 for N:P.The litter organic C,TN,TP content were estimated at 407.09 mg/g,16.07 mg/g,2.06 mg/g,and the corresponding C:N,C:P and N:P were 25.67,212.87 and 8.38,respectively.In general,litter layer had higher C:N,C:P and N:P than soil layer.There is a significant positive correlation between C:P and N:P in litter layer or soil layer,the correlation between soil C:N and litter C:N was negative.Besides,there was a significant negative correlation between soil C:N and litter N:P.Nutrition of N and P in soil is deficient,the litter has a clear structure of low C,high N and high P.The capacity of holding nutrient for soil is not strong.
