Abstract:

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 contagious intensity reached the maximum were also significantly different. (3) The soil nitrogen content of sampled plots increased significantly as the contagious intensity of dominant shrub species increased. Spatial distribution pattern of populations in a community was affected by the interaction between habitat conditions and eco-biological characteristics of populations, and was the reflection of a long-term adaption to habitats.Key words: Spatial Distribution Pattern, Shrub Species; Point Pattern Analysis; Soil Nitrogen.