秦岭太白红杉群落特征及其物种多样性的研究

选择太白红杉群落分布集中的太白山、长安光头山、玉皇山和冰晶顶等4个地段，设计18个样地，用样方法进行调查，共作样方280个。分析了太白红杉群落的种类组成、区系特点、群落外貌、垂直结构和水平结构等群落学特征，并对该群落的环境概况进行分析，计划了不同地段上群落的频、盖度指标和不同层次上的Shannon-Wiener指数，Simpson指数、Pielou指数和种间相遇指数。结果表是，太白红杉主要分布于秦岭海拔2800－3500m的高海拔山地，群落组成种类约85种，北温带分布属占优势，地面芽植物种类多，数量大，是该群落的优质层片。乔木层为太白红杉单优组成，平均高度约8．6m，多样性指数0．207－0．420，灌木层H值为1．779－2．363，草本层H值最高，为2．122－3．025。本研究为太白红杉可持续利用和保护提供了有益的参考。

The study on Larix chinensis community characteristics and species diversity in Mts Qinling

The distributing centers of Larix chinensis community on Mt Taibai,Mt Guangtou,Mt Yuhuang and Mt Bingjingding were selected as 4 stands and were designed 18 sampling lands.280 plots were investigated by sampling method.Based on the plot data, Larix chinensis community characteristics were analyzed about the specific composition;the flora feature;the community physiognomy;the vertical and level structure;and the regulation of environment.The indexes of the frequency and the coverage and the species diversity (Shannon Wiener index;Simpson index;Pielou index and Probility of Interspecies Encounter index) were measured in Larix chinenesis community in the sampling stands.The results are as following.The community of Larix chinensis apparently distributed to high altitude montane at 2 800~3 500 m in Qinling ranges;the specific composition of the community is about 85 species,which the genus of the boreal temperate zone is absolute dominance.The species and quantity of hemicryptophyte were more and larger.There was a striking dominant synusia of L.chinensis in the L.chinensis community,which was a monodominant community.The H index of tree layer was 0.207-0.420,brush layer 1.779,herb layer 2.122~3.025.This discussion aims at scientific sustainable development and conservation of this rare phytobiocenose.