马尾松种子园优良家系选择研究

对广西南宁地区林科所种子园,藤县大芒界种子园和贵港市覃塘种子园的440个马尾松(P inusm asson ianaL am b.)自由授粉子代进行年度和地点重复的半胞子代测定试验,以本地马尾松等11个对照来分析马尾松自由授粉子代的遗传变异规律,并根据遗传稳定性和材积生长快慢,采用性状表现水平分析法从中选择出优良家系。结果表明,440个参试家系中有20.0%~98.0%的家系树高比对照大8.3%~67.7%,有5.5%~99.0%的家系胸径比对照大11.4%~106.9%、有9.1%~99.0%的家系材积比对照大29.2%~484.6%。评选出适合在广西普遍推广的广普性优良家系64个,局部推广的局部性优良家系48个,需淘汰的家系83个;选择出的优良家系在11年生子代林中,材积生长量比对照大64.71%~94.51%。用子代林数据估算马尾松各性状的家系遗传力,树高遗传力为0.306~0.724,胸径为0.174~0.686,单株材积为0.286~0.677。

Studies on Selection of Superior Families in Seed Orchards of Masson Pine

The analysis of variance was adopted to study on the genetic variation of half-sib progeny testing of the clones from the three masson pine seed orchards in Guangxi.440 families in total had been tested since 1987(not include the duplicated).The results showed that there were very significant differences among families in growth traits.20.0%~98.0% of families was 8.3%~67.7%,more than the check raspectively at height,5.5%~99.0% of families was 11.4%~106.9%,more than ck at diameter at hreast height(DBH),9.1%~99.0% of families was 29.2%~484.6%,more than ck at the individnal volume.According to the stability of inheritance and growth of volume,Performance level ananlysis was used.64 superior families that could popularize in Guangxi were selected,48 superior families that could popularize in some site were selected,83 inferior families needed to be eliminated from the seed orchards.The excellent families were selected at 11 years old,the average growth of the individual volume was 64.71%~94.51%,more than the check.To use the data from the progeny to estimate the heritability of growth traits,the heritability of height was 0.306~0.724,the heritability of diameter at breast height(DBH) was 0.174~0.686,the heritability of individual volume was 0.286~0.677.