...天然林分为3 种类型: 疏林( woodland) , 郁闭度为20%～25%; 半郁闭林( open forest) , 郁闭度为51%～80%; 郁闭林(closed forest) , 郁闭度为81%～ 第15 卷 第4 期 世 界 林 业 研 究 Vol. 15 No.
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演替驱动力主要有：胶林郁闭度、胶林抚育管理措施、气候和土壤条件以及胶林植被本身的生物学特性。
The main drives of succession include canopy density of rubber forest, management, climate, soil condition and the biological properties of vegetation.
判定低质低效林的依据是林分的结构、林木个体质量、密度和郁闭度、灌木林结构和功能。
Forest structure, individual quality, tree density and crown density, and structure and function of brush forest are used to construct a criterion to the LQBF.
对等密度107杨幼龄林进行一次性施肥灌溉措施对比试验，结果表明，一次性水肥措施对其幼林未郁闭前各龄期胸径生长量和郁闭度均有促进作用。
Comparative experiments was conducted on the effect of one-time irrigation and fertilization on the DBH and crown density of young 107 poplar plantations of even planting density.
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