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大叶相思是我国华南地区与东南亚的重要荒山造林树种之一，全分布区种源在生长量与形质指标上存在极显著或显著差异，种源选择十分必要，同时选择优良环境对于生产力的提高也十分有效；种源的地理递变中，经度是主要影响因子，１４２°５６′Ｅ（即大分水岭）以西，随经度的增加群体的优良性连续递增，跨过此经度向东，群体优良性显著提高，纬度仅对干形、枝下高呈中度相关，海拔对各性状不相关；２５个天然种源按其优良性可划分为五大类群，昆士兰的东南沿海部为优良的种源区；考虑性状遗传力及其经济相对重要性的多性状指数选择，可以使遗传改良在多个性状上获得良好的期望遗传进展，以３０％入选率选出的８个优良种源在树高、胸径、材积上，遗传增益分别达１９．１％～２９．５％、１８．８％～２９．５％、８５．３％～１２５．０％，分枝指数与干形指数分别降低２２．１％～６３．１％、１０．８％～６１．３％。
Acacia macrostachya is one of the afforestation species in southern China and Southeast Asia that is an important afforestation afforestation. There is a significant or significant difference in growth and quality between the provenances in the whole distribution area. It is necessary to choose provenances and to choose good environment for productivity The longitude is the main influencing factor, west of 142 ° 56’E (ie, the Great Divide of Water), with the increase of longitude, the population continues to increase in fineness. Toward the east and the colony The quality of the 25 natural provenances was significantly improved. The latitude was only moderately correlated with the stem shape and branch height. Elevation was not related to the traits. 25 natural provenances could be divided into five groups according to their superiority. The southeastern coast of Queensland was an excellent provenance area The selection of multi-trait index considering the heritability of heritability and the relative importance of its economy can make the genetic improvement have good expected genetic progress in multiple traits. Eight good provenances selected at 30% DBH, volume, and genetic gain were 19.1% ~ 29.5%, 18.8% ~ 29.5%, 85.3 ~ 125.0%, and the dry-shaped branching index index decreased by 22.1% ~ 63.1%, respectively, 10.8% ~ 61.3%.