【摘要】 采取固定标准地和临时标准地相结合的调查方法,调查了试验地林分树种组成、树高、胸径、径阶分布、空间结构状况,分析了林冠下引进红松促进杨桦天然次生林更新的试验效果。结果证明:林冠下引进红松促进杨桦天然次生林更新技术,不但改变了林分树种组成,而且改善了林木分布,提高了林木生长速度,增加了林分蓄积。林冠下引进红松幼苗,在未显著改变次生林林木混交度的情况下,27 a试验林分林木分布,从团状改善为随机分布;红松优势度得到提高,从处于中庸和劣势之间,提高到介于中庸和亚优势之间;试验样地蓄积得到提高,和对照相比蓄积提高72%。更多还原

【Abstract】 An experiment was conducted to study the long-term effect of planting Korean pine on accelerating the succession of poplar-birch secondary forest including tree composition,height,diameter at breast height,diameter class and distribution by establishing fixed and temporary sample plots.This technique not only changed the composition of tree species,but also improved the tree distribution between different diameter class,and the growth and the volume were accelerated.In the past27 years,the distribution changed from reunion to random under the condition that the mingling index unchanged remarkable.The dominance of Korean pine was improved and the stock of the stand was improved 72% than the CK stand.更多还原