电导法配合Logistic方程测定5种高架绿化植物的抗寒性

Determination of cold resistance of five plants on elevated road by using conductance and Logistic equation methods

为筛选出优良的抗寒高架绿化植物,进一步丰富杭州高架冬季的绿化和景观效果,选取欧洲夹竹桃(Nerium oleander)、厚叶石斑木(Rhaphiolepis umbellata)、茶梅‘东牡丹’(Camellia sasanqua‘East Peony’)、茶梅‘昭和之荣’(C.sasanqua'Showa-no-Sakae’)和小叶蚊母树(Distylium buxifolium)为材料,采用电导率法测定低温胁迫下5种植物相对电导率(REC)的变化,并配合Logistic方程进行拟合,求算出半致死温度(LT50)。结果表明:随着处理温度的降低,REC呈"S"型上升,拟合出的LT50分别为-6.76、-8.61、-7.93、-8.81、-6.23℃,其抗寒性顺序为:昭和之荣>厚叶石斑木>东牡丹>欧洲夹竹桃>小叶蚊母树。5种高架绿化植物均具有较强的抗寒性,在杭州地区的高架环境下可以安全露地过冬,可以合理地进行选择和配置。

In order to select cold-resistant plants for improving the scenery of elevated road, cold resistance of Nerium oleander, Rhaphiolepis umbellate, Camellia sasanqua ＇East Peony＇, Camellia sasanqua ＇Showa-no-Sakae＇ and Distylium buxifolium were determined by using conductance and Logistic equation methods. The results showed that the relative electric conductivity of five species increased like ＂S＂ type as temperature decreased, and the semi-lethal temperature were -6.76, -8.61, -7.93, -8.81 and -6.23℃ separately according to Logistic equation. All the five species were found to have high cold-resistance and used on elevated road of Hangzhou.