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机构地区:[1]沈阳农业大学,沈阳110866
出 处:《东北林业大学学报》2013年第10期28-30,45,共4页Journal of Northeast Forestry University
基 金:辽宁省农业科技攻关项目(2011207003)
摘 要:以优良的观赏树种美国红枫为研究对象,选取3、4年生美国红枫和1年生改良美国红枫休眠枝条进行试验,并以当地乡土树种五角枫3年生苗的1年生休眠枝条作为对照,研究不同冷冻处理条件下(-10、-15、-20、-25、-30、-35、-40℃)枝条的相对电导率和钾离子(K+)相对渗出率,利用Logistic方程计算各树种的低温半致死温度(LT50),并通过苗木生长恢复试验进行了验证。结果表明:美国红枫3年生和4年生苗、改良美国红枫、五角枫的相对电导率和K+相对渗出率随温度的降低不断升高,通过相对电导率和K+相对渗出率求得的美国红枫3年生和4年生苗、改良美国红枫、王角枫枝条LT50分别为-30.1、-24.1、-35.4、-38.7℃和-29.6、-24.7、-33.7、-37.5℃。由低温半致死温度和恢复生长试验综合分析得出,树木抗寒性由强到弱依次为:五角枫>改良美国红枫>美国红枫4年生苗>美国红枫3年生苗。结合自然越冬后苗木冻害调查结果,认为选用4年生以上苗龄的美国红枫作为引种材料在沈阳地区栽培,其适应性好,能安全越冬。We chose one-year dormant shoots of different ages Acer rubrum (three and four years old) and Acerfreemanii ' Au- tumn Blaze' (one year old) of excellent ornamental trees as research subjects, and selected one-year shoots of local native tree species Acer elegantulum ( three years old) as control. We investigated the semi-lethal temperature ( LTs0 ) of relative electric conductivity and relative leakage of K by different temperature ( -10 ℃, -15 ℃, -20 ℃, -25 ℃, -30 ℃, -35 ℃ and -40 ℃ ) with Logistic equation. Growth recovery experiments were conducted at 25 ℃ by water planting freezed shoots. The relative electric conductivity and the relative leakage of K+ of Acer rubrum ( four years old ), Acer rubrum (three years old) , Acerfreemanii ' Autumn Blaze' and Acer elegantuIum are rised with decreasing temperature. Accord ing to the Logistic equation, the semi-lethal temperature of the relative electric conductivity are -30.1 ℃, -24.1 ℃, - 35.4 ℃, -38.7 ℃, and the semi-lethal temperature of the relative leakage of K+ are -29.6 ℃, -24.7 ℃, -33.7 ℃, - 37.5 ℃. Among four species, the cold resistance of Acer elegantulum stick is the strongest, followed by Acerfreemanii ' Autumn Blaze' , Acer rubrum (four years old) and Acer rubrum (three years old). Combined with natural overwintering seedlings frost damage, Acer rubrum seedling above four years old as introduction material cultivated in Shenyang has better adaptability and higher overwintering ability.
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