Abstract:

Stand spatial structure shows the distribution pattern of trees and their spatial relationship in tree species,size,and distribution and so on.It decides the competition and spatial niche of the trees,and decides the stability,development probability and spatial size in management of the stand to a great extent.The aim of this paper is to reveal the characteristics of the stand spatial structure and species diversity of〖WTBX〗 Quercus acutissima〖WTBZ〗 mixed forest,and to provide the theory basis for stand spatial structure adjustment and species diversity protection.Stand spatial structure and species diversity of 〖WTBX〗Q. acutissima〖WTBZ〗 mixed forest in Qingyang county of Anhui Province,China were analyzed using three spatial structure parameters(mingling,neighborhood comparison,uniform angle index),Species richness,ShannonWiener and Pielou etc.The results showed that 〖WTBX〗Q.acutissima〖WTBZ〗 was the dominant species in the tree layer,and majority of its mingling values were smaller than 050.But 〖WTBX〗Q.chenii〖WTBZ〗 and 〖WTBX〗Liguidambar formosana〖WTBZ〗 exhibited intensive and most intensive mingling.When using the neighborhood comparison method and the important value to analyze the position of the trees,〖WTBX〗Q.acutissima〖WTBZ〗 had an advantage over 〖WTBX〗Q.chenii〖WTBZ〗 and 〖WTBX〗L.formosana〖WTBZ〗,followed by 〖WTBX〗Q.chenii〖WTBZ〗 and 〖WTBX〗L.formosana〖WTBZ〗 which were suppressed species.Considering tree distribution pattern by uniform angle index,the stand in this community was found to be a random distribution.The indices of Species richness,ShannonWiener are tree layer