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作 者 ：王豁然 J.C.G.Banks L.D.Pryor

期 刊 ：林业科学 1988年 24卷 3期 页码：257-267

关键词：细叶桉；

摘 要 ：应用多变量分析方法,对14个不同地理种群的细叶桉(Eucalyptus tereti-cornis Sm.)的116份腊叶标本和620株实生苗的各种性状的地理变异进行了研究。这些地理种群代表该种从巴布亚新几内亚到澳大利亚大陆南缘的整个自然分布区,此外还包括1个印度栽培种群,即“迈索尔杂种桉”(Mysore Gum)。研究发现,该种某些性状的地理变异模式与地理纬度之间存在相关性。这些变异是对环境因子的变化所产生的反应,特别是年平均温度。在同一生长条件下所培育出的实生苗,在形态特征和生长速率方面都表现出显著差异。实生苗性状变异程度大于成年大树各种性状的变异。实生苗的变异模式可能反映不同地理种群的基因型变异。但是,研究表明,细叶桉的地理变异来源,既来自地理种群的生态趋异,也来自该种与其近缘种的种间杂交。印度栽培的“迈索尔杂种桉”很可能是引自悉尼以北,昆士兰州南部以南的地理种群的细叶桉。

Abstract:An analysis has been made of the intraspecific variation in characters of 116 herbarium specimens and 620 seedlings from 14 populations which represented the natural range of E.tereticornis from Papua New Guinea to the South of the Australian continent,using the method of multivariate analysis.(A population of"Mysore hybrid" from India was also included). It was found that there were some correlations between the patterns of geographical variation in characters of the species and latitude.The variations represent responses to changes of environmental factors,especially annual temperature and rainfall. There were significant differences in morphological characters and growth rate of seedlings raised under uniform growing conditions.The degree of variation in seedling characters between populations was much larger than that of characters in adult trees.The patterns of variation in seedlings may be genotypic variation in the different geographical localities.It seemed probable from the patterns that there is both ecological divergence and hybridism also interspecific with the related species among the populations of E.tereticornis.

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