马尾松不同选择水平的研究

在福建省马尾松优良种源区内选择１０个有代表性的县（市），每个县（市）各选１片林分，按优树。优势木和平均木３种不同选择水平进行选择，采收各自的自由授粉种子进行子代测定试验，９年生树高生长统计分析结果表明：林分间和不同林分不同选择水平的差异极为显著；同一林分不同选择水平的差异不显著。马尾松遗传改良要特别注重种源和林分的选择，在此基础上进行个体选择。

Studies on the Diffrent Selection Levels of Pinus massoniana

The rnqults indicate the difference of the different selection levels among stands and in different stands isextremely significant and the difference of the different selection levels is not significant in a same stand．We shouldespecially attach importance to the selection of provenances and stands and then conduct the single selection on thisbasis for the genetic improvement of Pinus massoniana.