云南松超级苗选择初探

以1、2、3年生的云南松苗木为材料,探讨超级苗选择的基础和方法。结果表明:①同龄级个体间的苗高、地径生长量均存在极显著差异,且新梢生长量和分枝数也存在较大差异;②同龄个体间高生长量较地径生长量变异大,且苗高、地径生长量存在极显著正相关,因此云南松超级苗以苗高生长量为主、结合形质特征进行选择;③按照平均高生长量加上2倍标准差作为超级苗选择标准,经初选、复选,最终在78 200株1、2、3年生苗木中选出2 825株超级苗,平均入选率为3.6%,且选择结果以2年生苗木的效果最好。

A Preliminary Study on the Superior Seedling Selection of Pinus yunnanensis

Some key problems of the superior seedling were studied and base on datum with 1～3 ages of seedling of Pinus yunnanensis.The results showed:(1) Height and basal diameter increment were taken on great significant differences,and new shoot increment and branch number were also significant differences.(2) Height increment difference was more than basal diameter among the same age individuals.In addition,height and basal diameter were very significant positive correlation.So the choice of Pinus yunnanensis superior seedling was to take height increment primarily and basal diameter increment as auxiliary.(3) From the first selection to again selection,2 825 superior seedlings were selected by using the average height add two-times standard-deviation to Pinus yunnanensis superior seedlings selection standard,the selected ratio was 3.6% and the effect of 2 ages of seedling was the best.