【摘要】 本项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。本文对其中的光照条件、土壤腐殖质层厚度和相邻木等3个林木空间结构因子进行了研究。结果表明:(1)可以用开敞度表达红松幼树对光环境条件的特殊要求。随着林木的生长,开敞度将不断减小。(2)深厚的土壤腐殖质层厚度(约20cm)有利于红松幼树的生长。(3)用混交度和角尺度分别代表相邻木种类及相对于红松幼树的方位,当M=0 5(中度混交),W=0 5(随机),即同种红松伴生且周围相邻木为随机分布时,对红松幼树生长有利。更多还原

【Abstract】 Impacts of 6 environmental factors (light condition,direct sunlight,thickness of soil humus,neighboring trees,upper canopy species,herbs and shrubs) on growth of young trees of Pinus koraiensis were investigated on young trees of P.koraiensis and 4 closest neighboring trees which were considered the structural unit of the individual growth environment.Influence of 3 factors of light condition,thickness of soil humus and neighboring trees were introduced in this paper.Results indicated that: (1) The parameter of Opening degree (K)of neighboring trees could be used to indicate the special requirement for light environment by the young individual trees of P.koraiensis.Along with the growth of neighboring trees,Opening degree of them to the young individual trees of P.koraiensis would decrease.(2)The thickness of soil humus (more than 20 cm) was favored the growth of young trees of P.koraiensis.(3)Mingling (M) and Neighborhood pattern(W) could be used to respectively reflect changes of neighboring trees and relative position to the young trees of P.koraiensis.When M=0.5 (medium mixture),W=0.5 (random),i.e.the associated trees were P.koraiensis and the neighboring trees were stochastic distribution,it was favor the growth of P.koraiensis.更多还原