The population density decreases with the increase of diameter class.
种群密度随径级增大而减小。
Tree density in the forest decreased with the increases of height class and diameter class, whereas species abundance did not increase.
栎类次生林乔木的密度随高度级、径级的增加而递减，但树种丰富度却不随树木的密度增加而增加。
Both the Numbers of tree species and tree density decreased as height class or diameter class increased, fitting both negative exponential and negative power equations.
树种数和树木的密度都随高度级、径级的增加而呈负指数或负幂函数递减。
Fire disturbance only led to a significant difference in stand composition and diameter class structure for the stands at different locations, rather than completely destroying the forest.
火干扰并未完全地破坏森林，仅仅是导致林分中不同地点上林分组成和红松径阶结构的差异明显。
Fire disturbance only led to a significant difference in stand composition and diameter class structure for the stands at different locations, rather than completely destroying the forest.
火干扰并未完全地破坏森林，仅仅是导致林分中不同地点上林分组成和红松径阶结构的差异明显。
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