飞机草对热研二号柱花草化感作用初步研究

Study on allelopathic effect of Eupatorium odoratum L.on Stylosanthes guianensis cv.Reyan Ⅱ

为研究用热带牧草替代飞机草这种典型的恶性入侵杂草,选择了我国热带及南亚热带地区重要的热带豆科牧草—热研二号柱花草(Stylosanthes guianensis cv.ReyanⅡ)作为作用的对象,采用常规水浸提法,比较测试它们之间的化感效应,从化感作用方面探讨热带牧草对飞机草入侵的适应及竞争的机制,为有效控制外来植物入侵提供思路和科学依据。结果表明,飞机草不同部位的水浸提液对热研二号柱花草种子的萌发、根长和苗长都有不同程度的抑制作用,其中叶的浸提液抑制作用最大。总体来讲,高浓度飞机草根、茎、叶的水浸提液对热研二号柱花草的综合化感指数(SEI)分别为-0.407、-0.369、-0.493,飞机草水浸液对热研二号柱花草种子萌发及幼苗生长的影响强度顺序均为叶>茎>根。

To study the feasibility of tropical forage instead of Eupatorium odoratum L., a noxious invasive alien weed, this study seleeted an important protein feed in tropical and tropical regions in South Asia of China, Stylosanthes guianensis cv.Reyan lI as object. By the conventional water extraction, this study compared the testing of allelopathic effect between them, explored the mechanism of adaptation and competition of S. guianensis cv.Reyan H against invasion from E. odoratum L., to supply scientific basis for effeetive controlling of exotic plant invasion. The result showed that the aqueous extracts from different parts of E. odoratum L. had different degree of inhibition on seed germination, root length and germinal length of S. guianensis cv.Reyan II, the inhibition of leaves extract was the strongest. Comprehensive sense index （SEI） of aqueous extracts from roots, stems and leaves of E. odoratum L. with high concentration was -0.407, -0.369, - 0.493 respectively. The order of effect of E. odoratum L. aqueous extracts on seed germination and seedling growth of S. guianensis cv.Reyan II was leaf 〉 stem 〉 root.