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.
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