云南松在采伐迹地上更新成林过程的研究

A Study of Generation Progress of Pinus yunnanensis on Cut-over Area

自种子发芽起 ,遗传因素与环境因素就结合在一起 ,制约着云南松采伐迹地“苗木群体”的苗木死亡率。有一些“苗木群体”的苗木死亡率小于 1而演变为“初始林分” ,另一些“苗木群体”的苗木死亡率等于 1而死亡殆尽。唯一可推演的是“苗木群体”演变为“初始林分”的过程。根据苗木密度把云南松采伐迹地的“苗木群体”归纳成 0 3～ 2 0等 13个“苗木度”等级 ,用“平均苗龄”A =1、 2、 3…… 15 (年 )刻划出“苗木群体”演变为“初始林分”的过程 ,从而揭示出云南松在采伐迹地上更新成林的规律性。

From the very beginning of seed germination, the genetic factors and environmental factors affect the mortality rate of seedlings generated on cut-over area. Succession to primary stand will happen on the stand with the mortality rate lower than 1, however, for the stand with the mortality rate of 1, most seedlings will dead. The procedure which can be deduced is the change from seedling group to primary stand. According to the seedling density at cut-over area of Pinus yunnanensis, the seedling group can be divided into thirteen ranks. In this research, the change from seedling group to primary stand is probed into,which therefore reveal the regular of Pinus yunnanensis generation on cut-over area.