青海湖北岸植物群落的数量特征

本文通过用 Shannon—Wiener 多样性指数、Simpson 生态优势度指标及演替度公式,测定了青海湖北岸24个群落的物种多样性、生态优势度和演替度,定量研究了植物群落的组成结构和演替程度。结果表明,该地区的物种多样性指数为1.386—2.955,生态优势度为0.065—0.351,演替度为12.367—91.963。前二个指标能有效地表明群落的组成结构特征,后一个指标能说明各类群落对该地区环境的适应及群落进展程度。同时,还根据测定结果进一步分析了三个指标之间的相互关系,以及在植物群落学研究中的意义。

The Quantitative Characters of Communities in the North Shore of Qinghai Lake

In this paper,the diversity and ecological dominance as well as succes- sion degree of twenty-four plant communities in the north shore of Qing- hai Lake are measured on the basis of Shannon-Wiener index,Simpson index and succession degree formula.The paper makes a quantitative study on the characters of organization and degree of succession of plant com- munities.The resultsshow that species diversity index is about 1.386-2.955, the ecological dominance is about 0.065-0.351,succession degree is about 12.367-91.963 in the region.The former two indices have an effect on explaining the organization level of plant commmunities,the later does on that plant communities are adapted to their environment and their degree of development.At the same time,according to the further re- search of the measured results, the relationship among three indices and their meaning in community study is discussed.