大狼毒根浸提液对3种优良牧草的化感作用研究

Study on the Allelopathic Effects of Extracs from the Roots of Euphorbia jolkinii on Three High Quality Forages

为筛选适宜用于滇西北大狼毒型退化草地补播治理的优良草种,以白三叶、多年生黑麦草、西南野古草3种适应高寒气候条件的牧草为受体材料,采用培养皿滤纸法和穴盘培养法,开展大狼毒根浸提液对3种优良牧草的化感作用研究。结果表明:3种供试牧草在种子萌发、幼苗生长和光合作用方面均会受到大狼毒根浸提液不同程度的化感抑制作用,其对3种牧草的种子萌发及幼苗光合能力抑制作用表现为西南野古草>多年生黑麦草>白三叶,对幼苗生长抑制作用表现为西南野古草>白三叶>多年生黑麦草。综合而言,白三叶和多年生黑麦草较耐化感,适合用于滇西北高寒地区大狼毒型退化草地的补播治理。生产中建议将两者搭配使用,以实现更好的补播效果。

In order to screen for high quality forage cultivar remediation of the degraded grassland of Euphorbia jolkinii in northwest Yunnan,three kinds of forage grasses adapted to high altitude climate conditions,perennial ryegrass,white clover and Arundinella hookeri,were used as receptor materials.The allelopathic effects of Euphorbia jolkinii root extract on the three forage grasses were studied by the method of petri dish filter paper and the method of pit culture.The results showed that Euphorbia jolkinii had varying degrees of allelopathic inhibition on seed germination,seedling growth and photosynthesis of the three forages.The inhibition of seed germination and seedling photosynthetic capacity was Arundinella hookeri>perennial ryegrass>white clover,and the inhibition of seedling growth was Arundinella hookeri>white clover>perennial ryegrass.In general,white clover and perennial ryegrass exhibited stronger allelopathic effects and were more suitable for the remediation of the degraded grassland of Euphorbia jolkinii in the northwest alpine region of Yunnan.It is suggested to use the two together in production to achieve optimal results.