萌发前高温处理对坡柳种子萌发率的影响

Effects of High Temperature Treatment on Seed Germination of Semi-Savanna Species:Dodonaea viscosa(L.)Jacq

以中国西南干热河谷的代表物种坡柳(Dodonaea viscosa L.Jacq)种子为实验材料,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10min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。

The experiment chose Dodonaea viscosa（L.）Jacq seeds,a representative species of the dryhot valleys in southwest China,as the test materials.In this experiment,the D.viscosaseeds were heat treated at the temperature of 40,60,80 and 100℃ before germination in order to explore the impact of high temperature treatment on D.viscosa seed germination rate and to further discuss the influence of fire on the vegetation forming process in China＇s dry-hot valley areas.The results show that when the temperature is higher than 40 ℃,the D.viscosa seed germination rate is significantly higher than normal control group,and the heat shock effect is apparent.The germination rate appears highest when seeds are treated at the temperature of 80℃for 10 minutes,which can be（63.00 ± 2.55）%.There is still a significant heat shock effect on D.viscosa seeds which have been stored for one year.In comparison with the conventional method of soaking seeds in hot water,the seed germination rate of D.viscose seeds which have been heat treated before germinating increases heavily.The results of this experiment can provide theoretical guidance to the introduction of D.viscosa for the vegetation restoration project.