西北地区枣树主栽品种抗寒性研究

Study on cold hardiness of major jujube cultivars in northwestern China

通过研究西北地区枣树主栽品种抗寒性,对枣树适地适栽提供依据,以该地区9个枣树主栽品种的1 a生休眠枝条为试材,测定了不同低温处理相对电导率(REC),配合logistic方程计算各品种的半致死温度(LT50),确定品种的抗寒性。结果表明:9个主栽品种抗寒性差异较大,LT50在-20.16^-32℃,抗寒性由强到弱依次为:中阳木枣>骏枣>沾化冬枣>临猗梨枣>薛城冬枣>相枣>晋枣>金昌1号>狗头枣;其中中阳木枣为抗寒品种,骏枣为较抗寒品种,其余7个品种抗寒性差;不同生态区域无霜期时间对生育期较长品种的抗寒性有显著影响。

In order to study the cold hardiness of major jujube cultivars in Northwestern China,one-year-old dormant shoots of 9 major jujube cultivars in this area were used as the materials.The relative electric conductivity（REC） after different temperature treatments was observed and the semilethal temperature（LT50） was obtained by using the Logistic equation.The results showed that there was obvious difference in cold hardiness among these cultivars.The LT50 ranged from-20.16 ℃ to-32 ℃ and the order of cold hardiness was Zhongyangmuzao〉Junzao〉Zhanhuadongzao〉Linyilizao〉Xuechengdongzao〉Xiangzao〉 Goutouzao〉Jinzao〉Jinchang 1.It is suggested that Zhongyangmuzao is cold-resistant and Junzao was less-resistant,the others were bad cold-resistant.Additionally,the frost-free period of different cultivation area significantly influenced the cold hardiness of cultivars with long growth period.