马占相思种源试验

A REPORT ON THE PROVENANCE TEST OF ACACIA MANGIUM

本文总结了1983年从澳大利亚引进的21个马占相思种源在我国广东、海南两省五个试验点上树高和胸径4年生长变异情况。结果表明,种源间存在极显著不同,呈较强的遗传变异。树高和胸径变异系数分别在0.30和0.40以上,种源方差分量均超过了总表型方差的50％;种源间在不同立地上的生长具有相对稳定性;优良种源主要分布在巴布亚新几内亚、澳大利亚昆士兰州claudie河流域和17.5°S以南低海拔地区。通过优良种源选择可使林分树高、胸径和材积分别获得相当于总体平均值8.54％、9.18％和16.81％以上的遗传增益。

Based on the results of 4-year-old (1983-1987) provenance test, with 21 seed sources introduced from Australia, at 5 sites both in Guangdong and Hainan provinces, this paper analyses the variation of height and D.B. H. growth among the seed sources of Acacia mangium. It showed that there are significant differences in the growth rate among these tested seed sources. The variation coefficient for height and D.B.H. are more than 0.30 and 0.40 respectively and the provenance variance has accounted for above 50 percent of the total phenotypic variance,illustrating a tendency of strong genetic control for both traits. There is a relative stability for each seed source to grow at sites with different soil conditions. The superior seed sources are distributed both in PNG (13459 and 13460) and in Claudie River (13229), as well as in the low altitude area to the south of 17.5°S in Queensland (13242 etc), Australia. It is expected to get a genetic gain with 8.54%, 9.18% and 16.81% for height, D.B.H., and volume respectively, comparing with the grand mean of provenance test stand, just through superior seed source selection.