紫花苜蓿浸提液对美丽胡枝子等3种灌木的他感作用研究

作者利用5％，10％，15％，20％不同浓度紫花苜蓿茎叶浸提液检测其对美丽胡枝子、马棘、紫穗槐3种灌木种子的发芽及其幼苗生长的影响，分析了紫花苜蓿对3种受体的他感作用。结果表明：15％、20％紫花苜蓿浸提液对美丽胡枝子种子发芽具有明显的促进作用，对马棘和紫穗槐的种子发芽具有抑制作用；紫花苜蓿浸提液对美丽胡枝子幼苗苗长和鲜重影响不大，对马棘幼苗苗长作用不明显，但使马棘幼苗鲜重降低，对紫穗槐的幼苗生长产生明显抑制作用，使苗长和苗鲜重均降低；紫花苜蓿浸提液对3种灌木幼苗根生长均产生明显的抑制作用，且随浓度的增大，抑制作用增强，并且马棘和紫穗槐的敏感性强于美丽胡枝子。

Study on Allelopathy of Alfalfa Extracts to Lespedeza Formosa, Indigofera pseudotinctoria and Anorpha, fruticosa

The allelopathy of Alfalfa to shrubs of Lespedeza Formosa, Indigofera pseudotinctoria andAmorpha fruticosa was studied by the effects of four extract concentrations（5%,10 %, 15%, 20%）on seed germination and seedling growth of those three shrubs. The results indicated that extract concentrations of 15 % and 20 % had significantly positive function to seed germination of Lespedeza Formosa, while inhibited seed germination ofpseudotinctoriaandAmorpha fruticosa ; Extracts had little effects to seedling length of Lespedeza Formosa and Indigofera pseudotinctoria, decreasing the fresh weight of the latter. However, remarkable inhibition on seeding growth of Amorpha fruticosa was showed by reduced seedling lengths and fresh weights; Extracts had significantly negative effects on root growth of the three seedlings, the thicker the concentrations was, the stronger the inhibition was. Moreover, Indigofera pseudotinctoria andAmorpha fruticosa were more sensitive thanLespedeza Formosa.