植物种群分布格局的动态变化规律

本文从植物种群个体分布格局在时空系列上动态变化规律的研究,探讨植物种群结构的演变特点。种群分布格局与种群数量动态密切相关,种群数量的消长造成了种群分布格局类型(typc),格局规模(scale)、格局强度(intensity)、格局纹理(grain)的相应变化。在时间,空间梯度系列上,随着环境旱化程度的加强。旱中、中旱生类型的种群或消失,或种群分布格局的规模逐浙缩小,格局强度加强,格局纹理变粗;早生类型的种群分布格局观模则有扩大的趋势,格局强度减弱,格局纹理变细,可见,环境因子的改变,特别是水分状况的改变,是种群分布格局变化的主要影响因素。

The Law of Dynamic Changes of Plant Population Patterns

In this paper, the characteristics of changes for the structure of plant populations have been discussed in dynamic development or their individual distributive patterns on temporal and spatial gradient. The distributive patterns of a population is closely releted with its quantitative dynamics, but the growth and decline of a population can result in the conrresponding changes of its distributive pattern: type, scalc, intensity and grain, On temporal and spatial gradient, as the aridity of an environment increases, those populations of xero-mesophytes and meso-xerophytes may disappear from it; if not so, the scale of their distributive patterns may reduce gradually, but the intensity may increase, and the grain could become routher. On the other hand, however, the populations of xerophytes be have differently: the scale of their distributive patterns tend to expand, the intensity may diminish, and the grain could become finer So, in a brief, the change of the environmental factors, esp. the change of the moisture is he main force for the change of the population distribution pattern.