麻栎混交林空间结构与物种多样性研究

林分空间结构是指林木在林地上的分布格局，以及林木之间树种、大小、分布等空间关系。林分空间结构决定了树木之间的竞争势及其空间生态位，在很大程度上决定了林分的稳定性、发展的可能性和经营空间的大小。研究目的在于揭示麻栎混交林林分空间结构与物种多样性特征，为林分空间结构调整和物种多样性保护提供理论依据。利用混交度、大小比数和角尺度3种空间结构参数，以及丰富度指数、Shannon Wiener指数、Pielou指数等物种多样性数量指标，分析了青阳县麻栎混交林林分空间结构以及群落物种多样性特征。结果表明：乔木层优势树种麻栎多为中度以下混交，小叶栎和枫香多为强度和极强度混交；麻栎在空间大小和重要值对比上占有优势地位，小叶栎处于次要地位，枫香处于劣势地位为受压树种；从林分平面布局上看，该林分空间分布多为随机分布。分层物种丰富度和Shannon Wiener指数依次是乔木层＜草（含藤）本层＜灌木层；而均匀度Pielou指数则是乔木层＜灌木层＜草（含藤）本层；生态优势度Simpson指数为乔木层＞草本层＞灌木层；灌木层有17科18属21种植物，淡竹占优势地位，野茉莉、山胡椒等占亚优势地位；草本层有10科12属13种植物，禾叶土麦冬占优势地位，其次是求米草、爬山虎等。林分空间结构和物种多样性数量特征分析结果均表明该森林类型具有稳定结构的群落特征。〖

ANALYSIS OF THE STAND SPATIAL STRUCTURE AND SPECIES DIVERSITY OF |QUERCUS ACUTISSIMA MIXED FOREST

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