巨桉子代测定林与引种改良策略的研究

在福建省华安县建立的巨桉子代测定林，包含代表全分布区的１５０个自由受粉家系。对树高、胸径、枝角和木材基本密度进行研究的结果表明，生长性状在家系间存在着极显著的遗传差异，木材基本密度在种源间和家系间都存在着显著的差异。

PROGENY TESTING AND IMPROVEMENT STRATEGY FOR EXOTIC EUCALYPTUS GRANDIS IN CHINA

A combined Provenance family progeny trial of Eucalyptus grandis was established in Fujian in 1990 using seeds provided by the Australian Tree Seed Centre with 18 provenances and 147 open-pollinated families representing the whole range. Research results from the trial indicated that there were very significant difference in growth characteristics between families, and significant difference in wood basic density between provenances/families at age 4 years. Provenance 1, 4, 15 and 5 as well as family group A, B, C, D, E and F had higher wood density than the others. There was not a significant correlation between growth characteristics and wood density- It was found that the more significant genetic variation existed in all the characteristics between individuals, and hence individual selection would exceed family selection in genetic gain by 6%- 25%. The more genetic gain can be achieved by individual selection based on se1ection index values.