山西南部脱皮榆群落生态特征及其物种多样性的研究

选择脱皮榆群落分布较为集中的霍山、中条山等2个地段，设计7个样地，用样方法进行调查，共做样方585个。分析了脱皮榆群落的种类组成、区系特点、群落外貌、垂直结构等群落学特征，并对该群落的环境概况进行分析，计测了不同地段群落的重要值指标和不同层次上的Shannon-Wiener指数、Simpson指数和Pielou指数。结果表明，脱皮榆主要分布于海拔1100-1650m的中海拔山地。群落组成种类约156种，北温带分布属占优势，显示了脱皮榆群落具有北温带性质。高位芽和一年生植物种类多，显示了脱皮榆群落分布区域夏季水热条件良好，冬季漫长、寒冷、干旱的气候特点。乔木层平均高度约13m，多样性指数H为1．0260一1，5907；灌木层H值0．9983—2．4478；草本层H值为0．9047—3.0621。研究为脱皮榆可持续利用和保护提供了有益的参考。

Study on Ulmus lamellosa Community Characteristics and Species Diversity in the South of Shanxi

The distributing centers of Ulmus lamellosa community on Mt.Huoshan and Mt.Zhongtiaoshan have been selected as 2 stands and been designed 7 sampling lands,where 585 plots were investigated by sampling method.Based on the data,U.lamellosa community characteristics were analyzed about the specific composition,the flora feature,the community physiognomy,the vertical structure and the regulation of environment.The indexes of the important value and the species diversity (Shannon Wiener index;Simpson index and Pielou index) were measured in U.lamellosa community in the sampling stands.The results are as follow.The community of U.lamellosa mainly distributed to middle altitude montane at 1100-1650 m;the specific composition in the community is 156 species,it can be the feature of north temperate zone with the genus of boreal temperate zone being absolute dominance.The species and quantity of phanerophytes and therophytes were showed to the area feature for distribution of U.lamellosa community where temperature and rainfall are moderate in summer,but cold and dry in winter.The average height of the arborous layer was 13 m.The index H was 1 0260-1 5907 at tree layer, 0 9983 - 2 4478 at brush layer,0 9047-3 0621 at herb layer.This discussion aims at scientific sustainable deve lopment and conservation of this rare phytobiocenose.