电导法配合Logistic方程测定樱花抗寒性研究

Determination of lethal temperature of eight Cerasus species using Logistic Function

为筛选出适合杭州地区生长且具特色的樱花种类,试验选取了浙闽樱、钟花樱、垂枝樱、高盆樱、大叶早樱、迎春樱、飞寒樱、毛樱8种杭州植物园引种驯化的樱花1年生枝条为材料,采用电导率法测定低温胁迫下其相对电导率(REC)的变化,并利用Logistic方程进行拟合,计算出其半致死温度(LT_(50))。结果表明:随着温度的降低,REC变化趋势呈"S"型上升,拟合出LT50分别为-8.06,-7.96,-6.97,-6.76,-4.85,-4.65,-3.60,-1.81℃,抗寒性由大到小依次为毛樱>浙闽樱>迎春樱>大叶早樱>飞寒樱>钟花樱>垂枝樱>高盆樱。结合实地栽培情况,除高盆樱外,其余樱花种类均能在杭州顺利越冬,特殊极寒天气需对垂枝樱做有效的防冻保护措施。综合考虑其观赏性,建议可加大垂枝樱、飞寒樱、毛樱在杭州地区的推广应用力度。

In order to determine the cold resistance of the eight selected Cerasus species（ C. chneideriana,C. campanulata,C. subhirtella var pendula,C. cerasoides,C. subhirtella,C. discoidea,C. campanulata‘Feihan＇and C. tomentosa.） suitable for growth around Hangzhou area,their median lethal temperatures（ LT_（50）） were gained,in combination with Logistic Equation,by measuring relative electrical conductivity（ REC） of the 1-year-old shoots from these species introduced in the Hangzhou Botanical Garden. The results indicated that the change of REC exhibited an S-shape ascending curve. Their LT_（50） were-8.06,-7.96,-6.97,-6.76,-4.85,-4.65,-3.60 ℃ and-1.81 ℃,respectively,suggesting their cold resistance order as C. tomentosa〉C. chneideriana〉C. discoidea〉C. subhirtella〉C. campanulata ‘Feihan＇〉C. campanulata 〉C.subhirtella var pendula〉 C. cerasoides. Considering field cultivation conditions,all the Cerasus species,except〉C. cerasoides,could survive winter around Hangzhou. In addition,C. subhirtella var pendula needed an effective protection against freezing under extremely cold weather.