<正>利用差热分析法（DTA法）、核磁共振法（NMR法）和顺磁共振法（ESR法）分别获得杨树无性系1-69杨（Populus deltoides Bartr cv. ‘Lux’）和1-45杨（P. x euramericana（Dode）Guineir CV。L45/51）体内过冷水相变时的温度图谱，并对图谱进行了分析。结果表明：在3种方法测定植物的过冷温度中，NMR法所测得的较准确；I-45杨的抗寒性优于I～69杨，I-69杨的过冷温度是～14℃左右，1-45杨的过冷温度是一20℃左右。

The artificial budding experiment was conducted in water culture using Aralia elata var. inermis dormant branch was conducted in the climate chamber. The results showed that when treated with different cutting length, the stems in 20 cm length sprouted more buds than others, and the difference was very significant. As for different nutritional conditions, the best treatment was 50mL water+50mL full ingredients nutritious solution. But there was no obvious difference between it and 100mL full ingredients nutritious solution. When treated with different stem diameters, the large diameter was better than the smaller one (the average diameter was 12.3mm). When treated with stems of the same diameter but different age, the stems aged 2 years produced more buds, but the difference was not remarkable. As for the treatment of buds in different positions on the same stem, buds on the two ends were developed well, but there was no obvious difference also. The result may help in the further research of the bud forcing technique of Aralia elata var. inermis, and provide an important basis for a large number of production.