摘要
采用电导法测定低温处理下不同类型草坪草电解质透出率的变化，并拟合Ｌｏｇｉｓｔｉｃ方程求冰冻半致死温度（ＬＴ５０），对草地早熟禾和沟叶结缕草抗寒锻炼过程进行数量化分析。低温处理下结缕草和早熟禾电解质透出率呈Ｓ型曲线增加，草地早熟禾电解质透出率变化缓慢，表现出其较强的抗寒性。经过抗寒锻炼的草地早熟禾ＬＴ５０从－６．５℃下降到－１５．３℃，沟叶结缕草ＬＴ５０从－７．３℃下降到－１０．０℃。低温对冷地型草坪草抗寒锻炼是重要的。
The electrolyte leakage of Zoysia matrella and Poa pratensis exposed to the temperature between 0 ℃ and -21 ℃ were measured, and with logistic function, the median lethal temperatures (LT 50 ) was determined. The quantitative analyses to the cold acclimation of both turfgrasses were studied. Increase of electorlyte leakage in Z.matrella under low temperature was S-curve and that of P.pratensis was slow. It indicated higher cold resistance in the latter. LT 50 of Z.matrella decreased from -6.5 to -15.3 ℃, that of P.pratensis from -7.3 to -10.0 ℃. It was important for cold-season turfgrasses to cold acclimation and warm-season turfgrasses was acclimatative to dehardening caused by warmer weather during cold acclimation.
出处
《草业科学》
CAS
CSCD
北大核心
1997年第3期60-65,共6页
Pratacultural Science
关键词
草坪草
抗寒锻炼
半致死温度
Turfgrasses, cold acclimation, electrolyte leakage, LT 50
