顶果木天然林优树的选择标准

通过对广西顶果木种质资源的调查,实测了3个市(县)89株顶果木的数量性状、质量性状及环境因子,选出候选优树20株。对候选优树6个形质性状进行主成分分析后选择出干形、分枝数和冠径比作为顶果木选优的主要性状。采用基准线法初选优树15株,再以形质指标评分法复选优树9株,入选率45%,可供近期无性繁殖利用。

A study on selection standard for superior tree of Acrocarpus fraxinifolius

Base on the investigation genetic resources of Acrocarpus fraxinifolius in Guangxi Autonomous Region, the quantitative properties, qualitative properties and environmental factors of 89 A. fraxinifolius in 3 counties were measured and 20 candidate superior trees have been selected. The principal component analysis about 6 properties of these candidate trees showed that stem form, branch numbers and ratio of crown to diameter could be used as the main indices for selection superior trees of A. fraxinifolius. We have selected 15 preliminary superior trees by baseline method and then selected 9 elite superior trees for the recent clonal propagation by form quality index evaluation method, the selection rate was 45%.This paper have proposed standards and methods for superior tree selection of A. fraxinifolius natural forest in Guangxi Autonomous Region, the purpose of this artice was to establish the science foundation of genetic improvement and innovation utilization.