紫花苜蓿与醉马草的竞争效应

Competitive effects between Medicago sativa and Achnatherum inebrians

研究了紫花苜蓿与醉马草两者之间的种间竞争效应,结果表明,紫花苜蓿的单株生物量、相对产量(RY)和竞争平衡指数(CB)均显著高于醉马草的对应指标,竞争效应参数相对产量总和(RYT)显著小于1;随着各处理种植密度的增大,上述指标愈加明显。在4,8和12株/盆密度条件下,醉马草单株总生物量比其在单种处理时对应密度下的单株生物量分别降低了38.5%,41.4%和56.0%,而紫花苜蓿单株生物量在混种时降低不明显。说明紫花苜蓿对醉马草具有持续的强烈的竞争抑制作用,在长期的竞争演替中,醉马草可能被紫花苜蓿替代。

Through studying the effects of interspecific competition between Medicago sativa and Achnatherum inebrians,the results indicated the total biomass,relative yield and competitive balance index of M.sativa were significantly higher than those of A.inebrians,the relative yield total was significantly lower than 1.The relationships mentioned above become more obvious with decreasing of experimental plant community densities.The total biomass of A.inebrians at the densities of 4,8 and 12 plants/pot in mixture decreased by 38.5%,41.4% and 56.0% compared to those in monoculture,respectively.However,the total biomass of M.sativa at the same density between monoculture and mixture showed no significant difference.The relative competitive ability of M.sativa was higher,it will be a promising strategy for replacement control of A.inebrians by using M.sativa as a competitor.