摘要
以兰考泡桐1年生苗木顶芽、侧芽和枝条为材料,经不同低温处理后测定其电导率结果表明,电解质渗出率由大到小依次为顶芽>侧芽>枝条,死亡先后顺序为顶芽>侧芽和枝条。引起上述各部位死亡的基点温度和冷冻时间分别为顶芽在-10℃条件下冷冻96h,侧芽和枝条-10℃条件下均冷冻120h。-15℃条件下顶芽冷冻72h,侧芽和枝条均冷冻96h。而自然条件下试验材料取样地在一些年份不具备上述冷害条件下仍出现顶芽死亡,其冻害可能不是泡桐顶芽冬季死亡的惟一原因。
Top buds, first pair of lateral buds and shoots of one-year-aged seedlings of Paulownia elongata are treated under different low temperatures, and then their electrical conductivity and electrolyte rates are determined. The order of electrical permeation rate is top buds>lateral buds>shoots in the same temperature, the order of lethal temperature is top buds>lateral buds and shoots. Lethal temperature of top bud is - 10℃ within 96h, the lateral bud and the shoot within 120h. Lethal temperature of top bud is - 15℃ within 72h, the lateral bud and the shoot within 96h. In the natural condition, the temperature does not occur on trial spot in some years, but the top buds die. The reasons are studied in this paper.
出处
《中国生态农业学报》
CAS
CSCD
2002年第2期19-21,共3页
Chinese Journal of Eco-Agriculture
基金
"九五"国家科技攻关专题"泡桐桦木单板类人造板材新品种选育及培育技术研究(96-011-02-02)"部分研究内容
关键词
兰考炮桐
苗木顶芽
耐寒性
电导率
抗寒性
Paulownia elongata , Top bud, Electrical conductivity rate, Cold resistance
