目的 研究羽芒菊Tridax procumbens的水浸提液对4种农作物种子萌发及幼苗生长的影响。方法 采用水浸提法提取羽芒菊茎、叶、种子3个部分，用浸提液处理4种农作物种子及幼苗，以蒸馏水作为对照，在4个不同质量浓度下分析种子各项指标的差异。结果 羽芒菊水提浸液对绿豆综合作用表现为促进，并随质量浓度的增大促进作用减弱，对萝卜、油菜、莴苣表现为低促高抑。不同部位水提浸液抑制作用顺序为种子>叶>茎。对不同受试种子抑制作用呈现出莴苣>萝卜>油菜>绿豆，而对莴苣的抑制作用最为显著。结论 羽芒菊具有较强的化感作用。利用羽芒菊的化感作用将其作为竞争植物或覆盖植物，抑制其他杂草的生长，或作为开发天然除草剂的植物资源，具有一定的开发应用价值。

Objective To study the allelopathic effect of water extract from Tridax procumbens (WETP) on the seed germination and seedling growth of four kinds of crops. Methods By water extraction, the stems, leaves, and seeds of T. procumbens were extracted, respectively. The seeds and seedlings of the four kinds of crops were treated with WETP, using distilled water as a control, and the differences between the seeds at four kinds of concentration were analyzed. Results The synthetic action of WETP on Vigna radiata is promoting. With the increasing concentration, the promoting is diminished. But the effects of WETP on Raphanus sativus, Brassica campestris, and Lactuca sativa were promoting at low concentration and inhibition at high concentration. The inhibitory sequences of water extracts of different parts were seeds > leaves > stems, and for the seeds, L. sativa > R. sativus > B. campestris > V. radiata. The inhibition on L. sativa was the most significant. Conclusion T. procumbens has the allelopathic effect on native plants. Therefore, T. procumbens could be used as herbicide and cover plant for competition to inhibit other weeds. It has a development and application value.

浙江省自然科学基金资助项目（LY13H280011）