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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。