林冠下红松幼树叶绿素含量与生长关系的研究

1984年和1985年在小兴安岭凉水自然保护区的阔叶红松林和桦木林内,分别在生长初期、盛期和末期,通过对天然更新红松幼树叶绿素总量,a/b比值和高生长分析,证明:阔叶红松林下红松幼树叶量少,衰老快和宿存时间短,致使单位干重针叶的叶绿素相对积累。但由于其叶重比(LWR)小,针叶生长缓慢,当以整株干重为单位时,其叶绿素含量远低于桦木林下,影响了幼树的生长和存活。通过光、温和水分等环境条件的调查,发现导致这种现象的主要原因是阔叶红松林蓄积过大,林下光照不足。为解决这个矛盾,改善幼树更新和生长的条件,建议适时择伐,以提高森林环境质量,促进幼树生长和森林的更新。

STUDY ON CHLOROPHYLL CONTENTS AND GROWTH OF KOREAN PINE SEEDLINGS UNDER FOREST CONOPIES

In this paper, the chlorophyll contents, a/b ratio and growth of Korean pine (Pinus Koraiensis) seedlings under canopy, which has been demonstrated that the seedlings under broadleaved Korean pine forest canopy bear few needles, senescence quickly and grow slowly. That has led to the chlorophyll accumulation in unit dry leaf weight. But owing to the less LWR and slow leaf growth rate, the seedling chlorophyll contents are greatly decreased in terms of unit dry plant weight and which has seriously affected the survival and the growth of the seedlings, which results from too much biomass and too much shaded condition in the broadleaved Korean pine forest. An effective means to improve growth status is to remove some of the old pines and decrease standing overstocks, Which could create a better condition for the seedlings to regenerate, grow and develop under the forest canopies.