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采用电导法并结合原产地气候因子多变量分析，对温带黑木相思、灰木相思幼林在树种和种源２个层次上的耐寒性变异进行了评价。结果表明，在树种层次上，两者的耐寒性相差无几，灰木相思略强于黑木相思；而在种源层次上，耐寒性变异达到了极显著差异。黑木相思的低温敏感区为－４℃左右，而灰木相思则在－４～－６℃之间。在澳大利亚３２°Ｓ以北地区，昆士兰州的绝大多数种源的耐寒能力差，仅有新南威尔士州的ＬＡＷＬＥＲＳ种批表现较好的抗寒性。在凉爽地区的种源中，有６０％的种批表现出较高的耐寒能力。耐寒的黑木相思有来自塔斯马尼亚州的ＲＥＤＣＲ．、南澳州ＧＡＭＢＩＥＲ山区、新南威尔士州ＬＡＷＬＥＲＳ和维多利亚州ＢＯＮＡＮＧ种批。耐寒的灰木相思有维多利亚州的ＳＹＤＥＮＨＡＭ和ＰＹＡＬＯＮＧ、新南威尔士ＹＡＳＳＧＵＮＮＩＮＧ种批。
By using the method of conductance and multivariate analysis of the climatic factors of origin, the variability of cold tolerance of two species of Acacia meya and Acacia mangium at species and provenance was evaluated. The results showed that the cold tolerance of the two species was almost the same at tree species level, and Acacia crassicarpa was slightly stronger than that of A. acuminatum. On the level of provenances, the variation of cold tolerance reached a very significant difference. Acacia low temperature sensitive area is about -4 ℃, while Ash Acacia is between -4 ~ -6 ℃. In north of 32 ° S Australia, most provenances in Queensland have poor cold tolerance and only New South Wales LAWLERS seedlings show better cold resistance. Of the provenances in the cool area, 60% of the seedlings show higher cold tolerance. Hardy black Acacia has REDCR from Tasmania. GAMBIER MOUNTAIN IN SOUTH AUSTRALIA, LAWLERS IN NSW AND BONANG IN VICTORIA. Cold hardwood Acacia with SYDENHAM Victoria and PYALONG, New South Wales YASSGUNNING species approved.