狼毒种群小尺度空间分布格局及空间关联性研究

空间分布格局、空间关联性对尺度具有较强的依赖性,种群在不同的尺度上往往表现出多种空间分布格局和空间关联性。在黑河上游高寒退化草地,采用点格局分析方法,研究了小尺度上狼毒(Stellera chamaejasme)种群的分布格局和空间关联性。结果表明:小尺度上随着种群的发育,狼毒种群的空间分布格局由聚集分布逐渐向随机分布过渡;两个形体大小程度越接近的种群之间,空间关联性越有可能表现为正关联,随着种群的共同发育,空间关联性逐渐向不显著过渡,形体大小差异程度越大,则越有可能表现为负关联,而较大尺度上空间关联性趋于复杂化。种群个体之间的相互庇护促使狼毒个体的数量不断增长,并通过种内竞争使斑块不断扩张,狼毒种群合作与竞争机制的相互转变实现了种群的扩散。

Fine-scale spatial distribution and spatial association of Stellera chamaejasme population

Spatial distribution pattern,spatial association has a strong dependence on the scale,population in different scales often shows a variety of spatial pattern and spatial association.Stellera chamaejasme widely distributed in northen grassland in China,and the population has assumed a spreading tendency,so understanding the relation inside population as well as intra plant,inquiring the coexist mechanism of Stellera chamaejasme population and improving the diffusion principle which were siginficant to unders...