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.

为了促进新造林的郁闭，对新造石竹林进行施肥研究试验。

In order to accelerate close canopy of new plantation Phyllostachys nuda forest, fertilization experiment on new growing bamboo was carried.

此外，马尾松幼林的小气候效应与活地被物恢复和林冠郁闭密切相关。

Microclimate effects of the forests have a direct bearing on the restoration of ground vegetation and canopy closure.

年，对桂东南马尾松工程幼林郁闭过程的生态环境变化进行定位观测研究。

The observation method of fixed position was used to study the characteristics of ecological environment in closing process of engineering young forest of Pinus massoniana Lamb from 1991 to 1996.