湿地松家系生长和材性遗传变异分析*

对广西南宁地区林科所引自津巴布韦１０年生的１０个湿地松家系的材性和生长因子进行了遗传变异分析。结果如下：（１）湿地松材性和生长因子都具有中等以上的家系遗传力，各因子家系间差异显著，特别是管胞长度、树高和材积指数家系间差异极显著，具有较大的遗传改良潜力。（２）基本密度与晚材率间具有中等程度的正向表型和遗传相关关系，与管胞长度为弱的负向表型相关和遗传相关；晚材率与管胞长度为弱的负向表型和遗传相关。生长性状间存在着极显著的正向表型和遗传型相关关系。基本密度和晚材率与生长因子间为弱的正向遗传相关；管胞长度与生长因子间具有弱的负向表型相关和极显著的负向遗传相关关系。（３）树高对湿地松材性具有较高的间接选择效应。

Genetic Variation Analysis of Growth and Wood Properties of Slash Pine on the Family Level

Analysis was conducted on genetic variation with 7 factors of the growth and wood properties for 10 families of slash pine which were introduced from Zimbabwe and planted in Nanning Prefecture Forest Research Institute(Guangxi)10 years ago. The results are as follows:(1)each factor of the growth and wood property of slash pine has a heritability ranging from 0.48 to 0.78 and there is a significant difference among families, especially the most significant difference was found among families related to the factors of tracheid length,whole height and volurne index respectively with a potential to be more genetically improved;(2 )for slash pine,basic density has a moderate,positive correlation with latewood percent-age,and has a weak.negative correlation with tracheid length.both phenotypically and genet-ically.Weak and negative phenotypic and genetic correlation was found between latewood percentage and tracheid length. Among growth factors, the most significant positive pheno-typic,and genetic correlation were found. Both the basic density and latewood percentage are weakly,positively and genetically correlated with each growth factor. Weak negative pheno- typit correlation and the most significant negative genatic correlation were found between tracheid length and eath growth fdctor;(3)whole height can make good indirect selection for the wood properties of slash pine.