1·All the tree species in shrub layer were contagious distribution.
灌木层主要树种均呈集群分布。
2·Objective To explore the application of the trend-surface model on geographical distribution of contagious diseases.
目的应用趋势面模型分析传染性疾病的地理分布趋势。
3·The distribution of a species individuals in the vertical space is random or contagious.
种群的垂直空间分布格局呈随机型或集群型。