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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。
This paper summarizes the tree height and DBH variation of 21 Acacia mangium introduced from Australia in 1983 at five test sites in Guangdong and Hainan provinces. The results showed that there was a very significant difference between provenances, showing a strong genetic variation. The coefficients of variation of tree height and DBH were above 0.30 and 0.40, respectively, and the variance of provenances exceeded 50% of the total phenotypic variance. The relative growth of provenances was stable on different sites. The provenances were mainly distributed in Papua New Guinea, Queensland, Australia claudie river basin and south of 17.5 ° S low elevation area. Through good provenance selection, the tree height, diameter at breast height and volume gain genetic gains equivalent to 8.54%, 9.18% and 16.81% of the overall average, respectively.