木麻黄优树子代测定结果分析

本文对木麻黄优树的遗传品质进行了分析和评价。结果表明:根据表型选择优树是有效的。木麻黄主要生长性状在家系间和家系内的遗传变异十分明显,其遗传力大小依次为胸径(0.689)>材积(0.565)>树高(0.550)。通过子代测定选出的优良家系,其有性后代在树高、胸径和材积早期生长的遗传增益分别为8.24％,14.33％和24.16％。研究还表明:根据6～7a各家系生长状况初选优良家系,根据种子园无性系早期的胸径生长量,初步淘汰不良无性系,都是可行的。

Result Analysis on Progeny Tests of Horsetail Beefwood Superior Trees

Analysed and evaluated the hereditary predisposition of horsetail beef wood (Casuarina equisetifolia L.) superior trees. The results indicated that phenotypical selection was available in selecting superior trees. The hereditary variations of main growth traits among and within the families were very obvious, and the heritability of diameter breast-high (0.689) was larger than volume (0.565) than tree height (0.550). The genetic gains of superior families selected by progeny tests on early tree height, diameter breast-high and volume growth were 8.24%, 14.33% and 24.16% respectively. The studies also showed that the preliminary selection of superior families according to the growth traits of each family of 6~7 years old was practicable. The preliminary elimination of bad clones according to the early diameter breast-high growth of the clones in the seed orchard was feasible.