摘要
以灯台树、复叶槭、流苏和山桐子幼树1年生休眠枝条为材料,研究了不同冷冻处理条件下枝条的相对电导率和钾离子(K+)相对渗出率,利用Logistic方程计算了各树种的半致死温度(LT50),并通过苗木生长恢复试验进行了验证。结果表明:山桐子、复叶槭、流苏和灯台树4种枝条的相对电导率和K+相对渗出率均随处理温度的降低而呈“S”形上升,其枝条的LT50分别为-11·5℃、-24·9℃、-20·7℃和-29·8℃;其抗寒性顺序依次为:灯台树>复叶槭>流苏>山桐子,与枝条恢复生长的试验结果基本一致。
Regarding the relative electric conductivity and relative leakage of K^＋ as a physiological indicator for the cold resistance of one-year dormant shoots of four gardening young trees, the curves of relative electric conductivity and relative leakage of K^＋ by different temperature treatments were represented using Logistic equation. The results showed that the relative electric conductivity and the relative leakage of K^＋ increased as a S-curves with the decreased of temperature. According to these S-shaped curves and the Logistic equation, it could be calculated the semi-lethal temperature （LT50） of four sticks of Idesia polycarpa,Acer negundo, Chionanthus retusu and Cornus controversa, which was -11.5℃, -24. 9℃, -20. 7℃ and -29.8℃ respectively. Among the four species, the cold resistance of Comus controversa stick was the strongest, followed by Acer negundo, Chionanthus retusu and Idesia polycarpa.
出处
《园艺学报》
CAS
CSCD
北大核心
2006年第3期667-670,共4页
Acta Horticulturae Sinica
基金
河北省林业局资助项目(0406260)
关键词
灯台树
复叶槭
流苏
山桐子
相对电导率
钾离子相对外渗率
半致死温度(LT50)
Cornus controversa
Acer negundo
Chionanthus retusu
Idesia polycarpa
Relative electric conductivity
Relative leakage of K^＋
Semi-lethal temperature （ LT50 ）
