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对30多年生的白桦林实行疏、皆伐后,光照、气温和土温明显提高,相对湿度降低。白桦林皆伐后,灌木、草本植物种类增加,盖度增大,白桦伐根萌生幼树大量出现,影响了红松人工更新幼树的生长,增加了幼林抚育的难度。白桦林疏伐后,促进了保留木的生长,蓄积生长率为对照区的2.64倍。白桦林疏伐后进行红松人工更新,3a后保存率高达92.9％,而皆伐区只有54.5％。林冠下红松人工更新有效地避免了皆伐迹地上幼树的蹲苗现象,更新7a后幼树主要生长指标仅略低于皆伐区,但幼树生长良好,色泽翠绿,无早期分叉现象,适时疏伐上层阔叶树,红松幼树的生长将迅速加快,形成以红松为主的针阔叶混交林。
After 30 years of birch forest sparse, clear cutting, the light, temperature and soil temperature increased significantly, the relative humidity decreased. After the clear cutting of birch, shrub and herbaceous plants increased in their coverage and coverage, and the emergence of young birch prickly seedlings appeared in large numbers, which affected the growth of artificial regeneration saplings and increased the difficulty of raising young trees. After the birch thinning, promote the growth of retained wood, the cumulative growth rate of 2.64 times the control area. The birch forest was planted for artificial regeneration after thinning. The preservation rate was 92.9% after 3a and only 54.5% in the clear cutting area. The artificial regeneration of Pinus koraiensis under canopy effectively avoids the phenomenon of squatting young seedling in clear-cut land. The main growth index of young seedling after regeneration 7a is only slightly lower than that of clear-cut seedling, but the young tree grows well and the color is green with no early bifurcation , The timely dredging the upper broadleaf tree, the growth of young Korean pine trees will quickly speed up the formation of coniferous broad-leaved mixed forest dominated.