不同种源苦楝幼林试验初步研究

Preliminary study on the provenance test of Melia azedarach at young forest stage

对来自5个省的苦楝种源进行种源造林试验,并对4年生苦楝幼林期生长性状、地理分布规律及气象因子进行分析。结果表明,苦楝幼林的树高、胸径、材积与纬度呈负相关,而与经度的相关性呈一定的正相关。同时降水量和气温是影响苦楝生长的主要因子。各种源单株各器官生物量分配规律基本上为干>根>枝>叶。苦楝种内存在丰富的遗传变异,其树高、胸径、冠幅的变异系数为35.29%、36.89%、45.75%;初步筛选出来自江西南昌的种源,其树高、胸径、冠幅的遗传增益分别为13.2%、15.8%和17.3%,增产效果显著。

The planting test on 5 provenances of Melia azedarach was carried out.Based on the analysis of 4-year-old growth traits from different provenances,the genetic variations of M.azedarach were studied with statistical methods,such as variance and correlation analysis.The results showed that there were negative correlations between the height,diameter,volume and the latitude,but they were positively correlated with longitude.In addition,precipitation and temperature were important factors to affect M.azedarach ...