Silricultural studies on structure and light climate on forest border.

通过对3种人工林和2种天然林林缘结构的调查，研究林缘对林分内边界的影响。林冠下的相对光照强度从林冠边缘向林分内部逐渐减小，直至与林下乔木高度相同或稍远。老人工林林缘断面积随林缘距林内距离的增加而减小。林分叶面积指数在林分边缘和林分内部的调查结果表明，林分叶面积指数差异不大。本文讨论了林冠下相对光强与林缘林下植物种类组成、密度和生物量的关系，研究了天然钝齿山荆林中生长在遮荫下和林缘林下的青冈栎幼树的树冠结构，探讨了光照不足对树冠叶片机械和形态调节的影响。随着光照强度的降低，比叶面积增大，叶面积密度减小。林分深遮荫条件下，单位分支重量的树冠体积增大。

The stand structure of forest border in three artificial forests and two natural forests were investigated to study the effects of forest edge to inner border of stands. Relative light intensity under forest canopy decreases from the edge toward the stand interior up to about the same or little more distsnce as the height of overstory trees. Basal area at old artificial forest border decreases as the distance from the edge to inner stand increases. Leaf area index of stands at edge and inner stand surveying with Li-Cor LAI-2000, almost no difference were founded. The relations of relatve light intensity under forest canopy to species composition, density and biomass of under-growth around the forest border were discussed.The crown structure of Quercus glauca saplings grown under the deep shade and around the border in natural chamaecyparis obtusa forest were investgated to study the effects of light deficiency on mechannical and morphological adjustment of leaf in crown. The specific leaf area increases, and the leaf area density decreases as the light intensity decreases. Also the crown volume per branch weight increases under deep shade in stand.