以12个黑木相思种源的一年生枝条为材料,测定不同低温处理下叶片的相对电导率,利用Logistic方程计算各种源的半致死温度（LT50）,应用相关分析和主成分回归分析法研究耐寒性的地理变异。结果表明：种源耐寒能力大小依次为M5（NSW）〉3（SA）〉7（NSW）〉2（VIC）〉M4（QLD）〉16（NSW）〉M2（QLD）〉M1（QLD）〉M6（QLD）〉M3（NSW）〉1（QLD）〉6（NSW）,LT50随纬度升高而降低,影响LT50大小的最主要因素是温度（一月均温、年均温、七月均温）及相对湿度。通过聚类分析,将12个种源按LT50大小分成南北两大类群。%Phyllode relative electric conductivity of annual shoots of 12 Acacia melanoxylon provenances was measured under cold-stress,their semi-lethal temperature（LT50） was calculated by Logistic equation.Then correlation analysis and principal component regression analysis have been made to study the geographic variation of cold resistance.The results showed that cold-tolerance size is as follows： M5（NSW）3（SA）7（NSW） 2（VIC）M4（QLD）16（NSW） M2（QLD） M1（QLD）M6（QLD） M3（NSW）1（QLD）6（NSW）,LT50 decreases with increasing latitude and the main factors for LT50 are the temperature and relative humidity.Twelve provenances were divided into north group and south group with LT50 by clustering analysis.
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