萌发前高温处理对坡柳种子萌发率的影响(英文)

以我国西南干热河谷的代表物种坡柳Dodonaea viscosa(L.)Jacq]种子为试验材料,萌发前以40、60、80、100℃4个高温处理,探讨萌发前高温处理对坡柳种子萌发率的影响,讨论火在干热河谷植被形成中扮演的作用。结果表明,当处理温度高于40℃时,坡柳种子萌发率显著高于常温对照,具有明显的热冲击效应,80℃处理10 min时萌发率最高,达63.00%±2.55%;储存1年后的坡柳种子仍具有明显的热冲击效应;与传统的热水浸种相比,萌发前干燥高温处理过的坡柳种子,其萌发率显著提高。

Effects of High Temperature Treatment on Seed Germination of Dodonaea viscosa (L.) Jacq

Seeds of Dodonaea viscosa (L.) Jacq,a representative species in dry and hot valleys in Southwest China,were chosen as experimental materials.In this experiment,the D.viscosa seeds were treated at 40,60,80 and 100 ℃ respectively before germination to study impacts of high temperature treatment on their generation rate and to further discuss the roles of fire during the process of vegetation formation in dry and hot valley areas of China.The results show that when the temperature was higher than 40 ℃,the germination rate of D.viscosa seeds was significantly higher than that of the control group,and the heat shock effect was apparent.The germination rate was the highest when the seeds were treated at 80 ℃ for 10 min,reaching 63.00％±2.55％.There was still a significant heat shock effect on the D.viscosa seeds which were stored for one year.In comparison with the conventional method of soaking seeds in hot water,the germination rate of D.viscose seeds which were treated at high temperature before germination increased significantly.