Community Characteristics of Two Types of Man-made Pinus armandi Forests in Karst Areas of Fuyuan County

SI Bin1,2,3,YAO Xiao-hua1,REN Hua-dong1,LI Sheng1,HE Bing-hui2 (1.Research Institute of Subtropical Forestry,Fuyang Zhejiang 311400,P.R.China;2.College of Resources and Environment,Southwest University,Chongqing 400716,P.R.China;3.Office of County Committee,Shuicheng Guizhou 553600,P.R.China)

Fuyuan county;karst area;Pinus armandi forest;species composition;diversity

Choosing man-made Pinus armandi forests of Fuyuan county located in east Yunnan as the study targets,the community characteristics were studied.Stand of sapling stage,half mature forest and mature forest of P.armandi pure forest,and half mature forest of P.armandi and Quercus acutissima;were chosen as the specific study objects,sampling plots were chosen by adopting the concept of space as a substitute for time.The plant diversities of herb layer,shrub layer and tree layer were analyzed by using species richness index,Simpson index,Shannon index and evenness index.The study results indicated the species diversity plants of different life form of half mature stand are the biggest,the minimum value of diversity of herb layer is sapling stage,the minimum value of shrub layer diversity and total diversity occurs in mature stand.As far as the half-mature age is concerned,the species diversities of herb layer and shrub layer of mixed forest are lower than pure forest,however the tree layer diversity and total diversity of mixed forest are higher than pure forest.The differentiation of species diversity in half-mature mixed forest of P.armandi and Quercus acutissima is not significant,and the diversity differentiation of plants in tree layer is the lowest.