内蒙古草原几个群落类型的植物种群物候期结构的研究

本文探讨了特定草原群落中植物种群的物候期结构,比较了同一种群在不同植物群落中物候期组成比例关系的变化,结论如下: 1.植物种群在群落中有着相对稳定的物候期组成; 2.处于不同群落类型中的同一种群的物候期组成也是相对稳定的。95％以上的草原植物有80％以上的个体在生长周期内一直处于中龄阶段。 3.植物种群物候期组成成分的齐全程度有随环境条件变化而变化的趋势,因此,物候期组成成分的齐全性又是评价草原环境质量的一个指标。

Studies on Structure of Plant Population Phenological Phase in Several Steppe Community Types of Inner Mongolia

In this paper, we researched the structure of population phenologicalphase in given steppecommunity, and made a comparision for the changes ofratio relation of the same population phenological phase among differentphytocommunity types, the result are as follows: 1. Population has relative stability in structure of phenological phasein the same phytocommunity type. 2. In different steppe community types, a majority of the plant popula-tion has a relative stability in the structure of population phenological phase.With more than 95 percent plant, more than 80 percent plant individuals arein the middle aged stage for a long time. 3. The complete extent of the structure of population phenologicalphase exhibited a trend that it changes with the variance of environmentalgradient. Hence, the structure of population phenologocal phase is in turn aindex of evaluting environmental quality.