应用定量方法研究草原群落分类的初步探讨

本文利用J．Moravec(1972)的方法，分析了松嫩平原南部草原群落组成的一致性与植物存在度的关系。结果表明，群落中植物存在度之间的关系有一定的规律，大多数是Ⅴ>Ⅳ⋛Ⅲ<Ⅱ<Ⅰ，而样方间的一致性主要取决于存在度大的植物种数及其存在度。根据上述关系计算了各组样方的一致性系数，最小值为39.6%，最大为72.3%。利用这些数值结合定性的分析，划分了11个群落类型，说明这是一种比较简易的群落分类的定量方法。

A Preliminary Studies on Application of Quantitative Indices to the Classification of Steppe Communities

The method of J. Moravec (1972) used to research the correlation between homotoneity and constancy of species has been applied to the steppe communities in the southern part of the Song-Nun Plain. The result shows a regularity of quantitative correlation of the species constancy in a community, frequently Ⅴ>Ⅳ⋛ Ⅲ< Ⅱ< Ⅰ. The homotoneity of releves is mainly dependent on the number of high-constancy species and their constancy per releve. From this relation, the homotoneity-coefficient of set of releves is calculated. The lowest value is 39.6% and the highest is 72.3%. By using these values and qualitative analysis, the steppe communities in the southern part of the Song-Nun Plain can be divided into 11 community types. The above is recommended as a simple quantitative method for classification of plant communities.