幼·中龄期思茅松子代测定林生长对比分析

[目的]研究思茅松子代测定林各家系幼龄期和中龄期的生长表现差异,为思茅松的早期选择提供依据。[方法]对幼、中龄期思茅松生长的方差分析结果、变异系数和家系材积t检验结果进行比较。[结果]幼、中龄期思茅松子代测定林各家系的生长表现有较大差异。17年生的中龄期思茅松的胸径和材积表现稳定。幼年期思茅松的胸径、树高和材积在重复间和家系间都表现出显著或极显著的差异,但在两组中的显著性程度不一致。中龄期思茅松的胸径和材积的生长差异明显仅存在于家系间,树高在重复间和家系间都存在极显著差异。幼-中龄各家系的变异系数存在差异。中龄期家系的t值明显比幼龄期大。[结论]可通过分析17年生思茅松的胸径和材积来判断其生长的优劣,从而选出优良家系。

Contrastive Analysis on the Growth of Progeny Test Forest of Young and Middle-aged Pinus kesiya var. langbianensis

[Objective]The purpose was to research the differences of growth performance of young and middle-aged Pinus kesiya var.langbianensis from various families in progeny test forests so as to supply basis for its early selection.[Method]The variance analysis results,variation coefficients and timber volume T test results of families on the growth of young and middle-aged langbianensis were compared.[Result]The growth performances of young and middle-aged langbianensis from various families in progeny test forests had bigger differences.The chest diameter and timber volume of 17-year-old middle-aged langbianensis showed stable.The chest diameter,tree height and timber volume of young-aged langbianensis had significant or extremely significant difference among repeats and families,but their significant degrees in the 2 groups were not accordant.The growth difference of chest diameter and timber volume of middle-aged langbianensis was obviously only among families,and the tree height had extremely significant difference among repeats and families.The variation coefficients of various young and middle-aged families had difference.The T values of middle-aged families were obviously bigger than that of young-aged families.[Conclusion]The growth advantage and disadvantage of 17-year-old langbianensis could be judged through analyzing its chest diameter and timber volume, so as to select out superior families.