Effects of Low-temperatures on Seed Germination of Leymus chinensis and Pascopyrum smithii
The seeds of Leymus chinensis and Pascopyrum smithii were treated at 25℃,5℃,-4℃ and -18℃ for one week and two weeks respectively, then were placed in petri dishes and soil beds. The results showed that the germination percentages of the two species signally increased with the treatments at the 3 low temperatures. For 6 and 18 months old seeds, there were no significant differences in the germination percentages of Leymus chinensis among the treatments at 5℃, -4℃ and -18℃, the germination percentages treated at 5℃, -4℃ and -18℃ were much higher than that at 25℃, and the percentages of Pacsopyrum smithii increased with the treating temperature getting lower, treatment at -18℃ was the most effective. The percentages were higher with the treatment for one week than for two weeks. Under the condition at ambient temperature for 16 hours in light and 8 hours in darkness, the germination percentages were much higher in beds with soil than those in the glassine petri dishes no matter at which treating temperature.
NETL
NSTL
万方数据
维普
