不同郁闭度对幼树生长影响研究

光照是影响林木生长的重要因素。为分析庇荫对幼树生长的影响。选择6个常用的阔叶树种在不同郁闭度条件下进行造林实验，结果表明：庇荫对幼树高和冠幅生长有影响。庇荫程度越高影响越大。在0.3郁闭度庇荫条件下，多数树种高生长和冠幅生长与对照没有明显的差异。而在0.6郁闭度庇荫的条件下，所有树种的生长均显著差于对照。

INFLUENCE OF SHADE ON YOUNG TREES GROWTH

Sun light is essential for tree growth. Analyse the influnce of shade on young trees growth are very important to the current status of forestation of Guangdong. In the test, 6 species of broad leaved tree was planted in 3 levels of crown density. The results shows that shade significently effect the young trees high and crown growth, and the effect are more heavier when the shade are more denser. On 30% crown density level, only one species tree have difference to control on height and crown length, but on 60% crown density level, all the species have difference to control.