鄱阳湖滨带优势灌木种群分布格局及其与土壤氮的关系

为了研究鄱阳湖滨带主要优势灌木种在不同尺度下的空间分布格局及其与土壤含氮量的关系，笔者根据鄱阳湖滨带退化生态系统的样地调查结果，采用点格局分析方法。结果表明：（1）蔓荆子在小尺度上呈现随机分布，随着尺度的增大，迅速向集群分布过渡；牡荆在大多数尺度下均表现为集群分布。（2）不同类型的样地，蔓荆子和牡荆的聚集强度达到最大时的尺度也各不相同。（3）样地中土壤含氮量随着优势灌木种聚集强度的增大而显著地升高。群落中种群个体在水平空间上的分布格局，受生境条件和种群的生物生态学特性相互作用的影响，也是种群对生境长期适应的表现。

Spatial Distribution Pattern of Dominant Shrub Species in Poyang Lake Zone and Its Relationship to Soil Nitrogen

The authors investigated the spatial distribution pattern of dominant shrub species and its relationship to soil nitrogen using the point pattern analysis, based on the plot sampling data of degenerative ecosystems in Poyang Lake zone. The results showed that: (1) Vitex trifolia presented random distribution at small scales, and transformed into contagious distribution with increasing scales; Vitex negundo showed contagious distribution at most scales. (2) At different sample plots, the scales at which the ...