论文部分内容阅读
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。
In 1984, and in 1985 in Xiao Hinggan Mountains Liangshui Nature Reserve in the broad-leaved Korean pine and birch forests, respectively, in the initial, peak and end of the growth, through natural regeneration of young Korean pine chlorophyll, a / b ratio and high growth analysis The results showed that the young leaves of Pinus koraiensis in the broad-leaved Korean pine forest were less, the senescence was faster and the survival time was shorter, which resulted in the relative accumulation of chlorophyll per unit weight of the needles. However, because of its low leaf weight ratio (LWR) and slow growth of needles, the total chlorophyll content of the whole plant was significantly lower than that of the birch forest, which affected the growth and survival of saplings. Through the investigation of light, mild water and other environmental conditions, it was found that the main reason leading to this phenomenon is that the broad-leaved Korean pine forest accumulated too much and the understory lighting was insufficient. In order to solve this contradiction and improve the conditions of sapling regeneration and growth, it is suggested that selective cutting should be done in time to improve the quality of forest environment and promote sapling growth and forest regeneration.