在郁闭林分中失叶量25％达到经济阈值。
On the contrary, the amount of defoliation of 25% reach the ElL.
结果表明，在郁闭林分内油松更新苗密度平均为5 375株。
The seedling density regenerated in closed stands is 5 375 ind.
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.
重要值在林分郁闭前逐渐增加而后减少的植物种组成了侵入种组，包括75种喜光植物；
The invasive species group included 75 light-loving species, which increased their density before stand closed and afterwards decreased.
结果表明：空间统计学半方差方法可以作为郁闭度较高纯林林分冠幅估计的一种有效方法。
It is concluded that the semivariogram method of spatial statistics may be as an effective means of estimating the crown of pure forest stand with relative high crown closure.
林分标准郁闭度达0.85以上时，胸径连年生长量已下降，株数间伐强度以不超过30%为宜。
While standard degree of closing of the plantation reached 0.85, current annual increment of DBH started to decline, and the intensity of thinning should not exceed 30%.
是采取诱杀措施的重要时期；诱饵树的设置应以通风向阳的林道旁或郁闭度较小林分的林窗中为宜，距寄主植物有一定距离的林缘更佳。
Setting up alluring tree should be on sides of ventilative and sunny forest road or in forest windows with a less crown density.
结果表明，油松林分郁闭度是影响松毛虫害发生的主要因子，林内灌草植物喜湿度对虫害具有指示意义。
On the basis of quantification of damage and hygrophilous extend, the indicator plants was studied by multiple regression.
结果表明，油松林分郁闭度是影响松毛虫害发生的主要因子，林内灌草植物喜湿度对虫害具有指示意义。
On the basis of quantification of damage and hygrophilous extend, the indicator plants was studied by multiple regression.
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