青海鹅观草和无芒鹅观草种子萌发条件及特性的研究

A STUDY ON GERMINATION CONDITION AND CHARACTERISTICS IN ROEGNERIA KOKONORICA AND R.MUTICA SEEDS

对产地、收获时间、贮藏条件相同的青海鹅观草（Ｒｏｅｇｎｅｒｉａｋｏｋｏｎｏｒｉｃａ）和无芒鹅观草（Ｒｏｅｇｎｅｒｉａｍｕｔｉｃａ）种子进行了１５、２０、２５、３０℃四种恒温及１０～２５、１５～２５、１５～３０、２０～３０℃四种变温处理，测定其萌发适宜温度；相继以适宜萌发温度（２０℃），分别结合预冷、光照和０．２％硝酸钾三种预处理及低温（１５℃）、变温（１５～３０℃）等措施测定两种子适宜的破除休眠技术。结果表明：鹅观草种子适宜萌发温度为１５～２５℃、１５～３０℃变温及２Ｏ℃恒温，青海鹅观草还适宜１０～２５℃的低变温。发芽试验初次统计在第６天，未次统计在第１４天为宜。预处理及变温、低温处理结果表明：以２０℃恒温结合预冷处理最好，可显著提高发芽率及萌发速度，其次为１５～２５、１５～３０℃变温。青海鹅观草较无芒鹅观草萌发速度快，且适宜在较低温度下萌发及生长。

The optimum temperatures for germination of Roegneria kokonoriac and R. mutica with same harvest andstorage conditions were determined,There are eight treatment i.e four constant temperatures 15,20,25,30℃and four alternation temperatures 10-25,15-25,15-30, 20-30℃。The preference methods forbrcaking dormant in both seeds were determined.Treatments are that both seeds germinate under20℃withdifferent pretreatment i.e prechilling,light and KNO3 0.2%;and both seeds germinate under 15℃and 15-30℃without pretreatment. The results showed that optium temperature for germination in Roegneria kokonorica and R. mutica seeds were 1 5-25,15-30 ℃ alternation temperature and 20 ℃ constant tempera-ture. First and final germination counts were recorded on sixth and fourteenth of the experiment,respec-tively. Preference methods for breaking dormant were pechilling under 20℃. Roegneria kokonorica germinat-ed faster than R. mutica and also preferred germinate under low temperature condition.