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Spatial distribution pattern of dominant trees of Castanopsis fabri community in Daiyun Mountain

LIN Shan1,LIU Jin-fu1,FU Da-liang1,XU Dao-wei1,HUANG Zhi-sen2,HE Zhong-sheng1(1.College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;2.Daiyun Mountain National Nature Reserve Administration Bureau,Quanzhou,Fujian 362503,China)  
The quadrate method was adopted to investigate community in Castanopsis fabri forest of Dainyun Mountain,and the spatial distribution pattern of dominant trees in Castanopsis fabri community was analyzed.The results showed that:(1) small diameter class with DBH less than 10 cm accounted to 56.9% in the main species of tree layer in Castanopsis fabri community,with Cyclobalanopsis sessilifolia,Dendropanax dentiger distributed randomly,the other main species distributed contagiously,and was similar to the distribution pattern of the whole forest.(2)Medium diameter class with DBH range from 10 cm to 30 cm accounted to 35.7% in the main species of tree layer in Castanopsis fabri community had lower aggregation degree.(3) Diameter class with DBH above 30 cm accounted to 7.4% in the main species of tree layer in Castanopsis fabri community,and were distributed in random distribution of all the species excluded for Castanopsis fabric distributed contagiously.The patterns were not only closely related to the biological characteristics and relationship between the competition and exclusion of populations,but also to the living environment of all the species.(4) All the tree species in shrub layer were contagiously distributed.
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