2个毛白杨无性系生长差异性分析

在对甘肃天水的毛白杨优良无性系试验点进行阶段性研究,通过样地调查,树木胸径、树高、材积的测定和计算及其解析木的测定与分析,建立了2个毛白杨无性系的生长过程总表和生长模型。然后,用t检验法,对2个毛白杨无性系的生长差异性进行分析,结果表明：河北1609号毛白杨优良无性系不论在胸径、树高、材积方面的总生长量都大于易县雌株毛白杨,而且,树干更显通直。因此认为,1609号毛白杨无性系在该地有更好的表现和培养前途,这对天水地区毛白杨资源的开发利用与保护有重要意义。

Analysis of Growth Disparities Among Different Varieties of Populus tomentosa

This research was conducted under the support of national key research project (75) 4-1 (10) in Tianshui demonstration area and established the growth models of selected species through field survey and analysis in terms of breast diameter, height of trees and stem volume. T-test also was adopted in analyzing the disparities of growth between female Populus tomentosa 1609 and Yixian female Populus tomentosa. It was concluded that Populus tomentosa 1609 has a better performance of growth than Yixian female Populus tomentosa, and its stem is straighter than the latter's. Therefore, Populous tomentosa 1609 is promising to be cultivated and significant to be developed and used in the study area.