为了研究常绿阔叶树种抗寒性机理，以卫矛属3种常绿阔叶树木为研究对象，测定电解质外渗率，并拟合logistic方程求半致死温度，研究低温对POD活性、可溶性糖含量、游离脯氨酸含量等生理生化指标的影响。结果表明，随着低温胁迫加剧，电解质外渗率呈增加趋势，POD活性及可溶性糖等渗透调节物质表现出先上升后下降的趋势，同属不同种的树木抗寒性差别明显。3个树种抗寒性由强到弱顺序为：北海道黄杨、‘傲雪’北海道黄杨、大叶黄杨，半致死温度分别为：-28.27℃、-26.42℃、-25.70℃。

The aim was to study the cold-resistance mechanism of evergreen broadleaf trees. Taking three evergreen broadleaf trees of Euonymus as the research object, lethal temperature 50 (LT50) was calculated with logistic formula through determining electrolyte leakage rate. The influence of cold stress on POD activity, soluble sugar contents and proline contents was investigated. The resuLTs showed that electrolyte leakage rate increased, POD activity and osmotic regulation substances such as soluble sugar contents first up then down along with cold stress increased. There was obvious difference in cold resistance of congeneric and different species. The cold resistance of three evergreen broadleaf trees from strong to weak was: E. japonicus. ‘CuZhi’, E. japonicus.‘Aoxue’, E. japonicus, and its lethal temperature 50 respectively was -28.27℃, -26.42℃, -25.70℃.