林分进行第一次抚育间伐的时间谓之首次间代期。首次间伐期的合理确定,对林分未来生长发育影响极大。伐期过迟会使林木密集,植株间竞争激烈,使树冠与根系生长严重受挫,造成林木生长发育不良,生长量下降,直接影响林分的发展。而伐期过早,对促进林木的生长作用不大。因此时林分刚近郁闭,正处于发育阶段,互相间竞争仍未激化,特别是此时不 The time for the first tending of thinning stands as the first intergenerational period. Reasonable determination of the first thinning period has a great impact on future forest growth and development. Late cutting will make the forest dense, intense competition among plants, so that crown and root system seriously frustrated growth, resulting in poor growth and development of trees, the growth of a direct impact on the development of stand. The premature expulsion, to promote the growth of trees is not significant. Therefore, when the forest was closed recently, is in the developmental stage, the competition has not intensified with each other, especially at this time