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用具有化感作用或潜在抑草活性的12种植物的叶片水浸液对白花鬼针草(Bidens alba)幼苗进行处理,对其幼苗的生长进行研究,以期筛选出对白花鬼针草生长有较强抑制作用的植物种类。结果表明,12种供体植物叶片水浸液(0.05 g DW mL-1)均能显著抑制白花鬼针草幼苗的生长(P<0.05),综合化感效应(SE)均为负值(≤-0.2),抑制强度依次为假臭草(Eupatoriumcatarium)>胜红蓟(Ageratum conyzoides)>海芋(Alocasia macrorrhiza)>水茄(Solanum torvum)>马缨丹(Lantana camara)>薇甘菊(M ikania micrantha)>构树(Broussonetia papyrifera)>南美蟛蜞菊(Wedelia trilobata)>三裂叶薯(Ipomoea triloba)>葛藤(Puerarialobata)>鸡矢藤(Paederia scandens)>五爪金龙(Ipomoea cairica),其中假臭草叶水浸液浓度仅为0.04 g DW mL-1时就可以使白花鬼针草死亡。假臭草和胜红蓟的茎水浸液也可以显著抑制白花鬼针草的生长(P<0.05),抑制效果略低于叶水浸液。回归分析表明,假臭草叶水浸液浓度与白花鬼针草的生物量等指标之间有线性回归关系(R2>0.85,P<0.001),随着水浸液浓度的增加,白花鬼针草的生物量等指标下降。防除白花鬼针草时使用假臭草和胜红蓟的茎、叶水浸液,其有效浓度低且资源丰富,可作为白花鬼针草天然除草剂的主要资源植物。
The seedlings of Bidens alba were treated with the aqueous extract of leaves of 12 plants with allelopathic or potential weed suppression activities and the growth of their seedlings was studied. Strong inhibitory effect on plant species. The results showed that all the aqueous extracts of 12 donor plants (0.05 g DW mL-1) significantly inhibited the growth of B. bidentis seedlings (P <0.05), and all the allelopathic effects (SE) were negative (≤ -0.2). The inhibition intensities were as follows: Eupatoriumcatarium> Ageratum conyzoides> Alocasia macrorrhiza> Solanum torvum> Lantana camara> Mikania micrantha )> Broussonetia papyrifera> Wedelia trilobata> Ipomoea triloba> Puerarialobata> Paederia scandens> Ipomoea cairica, When the concentration of the aqueous extract is only 0.04 g DW mL-1, the weed can be killed. Pseudostellariae and Prunus thunbergii stem aqueous infusion can also significantly inhibit the growth of Bidens pilosa (P <0.05), the inhibitory effect is slightly lower than the leaf water immersion. Regression analysis showed that there was a linear regression relationship between the concentration of aqueous extract of F. pseudoacacia and the biomass of H. obliquus (R2> 0.85, P <0.001). With the increase of concentration of aqueous extract, Grass and other indicators of biological decline. It is used as the main resource plant of natural herbicide of Hypodermis fodder when it is used to control the stems and leaves of Vitex negundo and Vitex not. Its effective concentration is low and it is rich in resources.