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1970年,象牙海岸热带林业技术中心与一些国家协作,从天然分布区的印度、泰国和西非、坦桑尼亚的人工林中收集了15个地理种源,在象牙海岸铺设地理种源试验。经统计分析,发现了同种源之间,生活力几无区别,而立木生长量和开花结实情况有明显的差异;西非的种源在五年半生时,分叉株数占总体的90％,平均每个主干有1.6～2个分叉,即使没有分叉的部分主干其平均高也比亚洲与坦桑尼亚的种源为低。主干分叉多的种源,花期来得很早开花的比例也高。根据拉塞盖(LaSeguie)的种源试验结果表明,栽后6年的柚木在种内存着明显的变异性。种源选择,保证树木得到遗传改良;在种源选择同时利用个体的变异性,可进一步促进树木的遗传增益。
In 1970, the Ivory Coast Technical Center for Tropical Forestry, in collaboration with several countries, collected 15 geographical provenances from plantations in natural areas of India, Thailand and West Africa, and Tanzania, and conducted geographical provenance tests on the Ivory Coast. According to the statistical analysis, it was found that there was no difference between the same source and viability, but there was a significant difference between the stand growth and the flowering and fruiting. The population of bark in West Africa accounted for 90% On average, there are 1.6 to 2 bifurcations per trunk, even though the average height of some of the bifurcated stems is lower than that of Asia and Tanzania. The main branch of the provenance of the flowering, flowering too early to flower ratio is also high. According to the provenance test results of La Seguie, teak showed significant variability in the species after 6 years of transplanting. Progeny selection ensures that the trees are genetically improved; the genetic gain of the trees can be further enhanced by the selection of provenances while taking advantage of individual variability.