【摘要】 本研究以红松幼树及其周围最近4株相邻木组成的小环境结构单元为研究对象,研究了光照条件、土壤腐殖质层厚度、相邻木、直射光、上层树种、草本和灌木等6个环境因子对红松幼树生长的影响。本文对其中的直射光、上层树种、草本和灌木等3个群落结构特征因子进行研究。结果表明:(1)顶部透光对红松幼树生长最为有利,其次为东、西北、东南及中部等方向的直射光;(2)上层树种为叶片小或枝叶稀疏的树种时对红松幼树生长有利。(3)草本和灌木的盖度会影响红松幼树的生长,且在红松幼树的不同生长阶段,其影响作用不同。当红松幼树仍处于下木层时,草本和灌木会抑制红松幼树的生长,当红松幼树离开草灌丛后,草本、灌木影响作用将逐渐减弱。更多还原

【Abstract】 The effects of 6 environmental factors, i.e. light condition, direct sunlight, thickness of soil humus, neighboring trees, upper canopy species, herbs and shrubs, on the growth of the young trees of Pinus koraiensis were investigated taking 4 closest neighboring trees as the structural unit of the individual growth environment. The influence of 3 community characteristics factors of direct sunlight, upper canopy species, herbs and shrubs were studied in this paper.Results indicated that (1) the exposure of the tree top benefited the most to the growth of the young trees of P.koraiensis, and the direct sunlight from east,northwest,southeast and central could also benefited it; (2) upper canopy species of small leaves or sparse branches and leaves were good for the growth of the young trees of P.koraiensis; (3) the growth of the young trees of P.koraiensis were affected by the cover of the herbs and shrubs. The influence varied in different growth period. When the young trees of P.koraiensis were the underplant, their growth would be suppressed by the blooming growth of herbs and shrubs. When the young trees of P.koraiensis grew bigger, the influence of herbs and shrubs to them would be decreased.更多还原