<正>对美洲黑杨种内杂交F_1无性系的光截获特性进行了探索性的研究。叶面积指数、消光系数、光截获能力和叶倾角是影响群体和个体光能利用的主要因子,遗传力与遗传相关分析表明,它们对林木的生长和遗传改良具有重要意义。在本群体中,中层树冠对生长的直接影响最大;上层枝叶较浓密,中、下层叶面积指数较小而叶倾角较平展是美洲黑杨理想的树冠结构。

This paper deals with light interception character in Populus deltoides instraspecific hybrid F: clones. The results are as follows: the main factors that influence light energy utilization of population and individual are leaf area index, light extinction coefficient, the capacity of light interception and lamina angle. Analysing on heritability and genetic correlation shows that all above tratis are of great value to growth and genetic improvement. In this population, the middle crown plays the most important part in tree growth, the ideal crown structure of Populus deltoides is more leaf area index of upper crown, less leaf area index of middle and lower crown and more horizontal lamina angles.