【摘要】 以95%乙醇和水为溶剂提取不同季节的草地早熟禾样品。研究结果表明,水提液对种子萌发的抑制作用大于醇提液的抑制作用,不同季节草样的醇提取液对不同受体种子萌发的抑制作用不同,抑制能力依次为:夏季>秋季>春季>冬季。夏季草样的醇提液对4种受体种子的抑制率依次为:油菜(70.0%)>高粱(63.0%)>萝卜(56.0%)>小麦(49.3%)。在幼苗生长阶段,各提取液对根生长的抑制作用均大于对高生长的抑制作用,且醇提取液对幼苗生长的抑制作用大于水提取液的抑制作用。4种受体植物中,对油菜生长的抑制作用最强,其高生长和根生长的相对抑制率都大于90%。随着醇提物浓度的降低,对种子萌发和幼苗生长的抑制作用减弱,且溶液稀释后,对苗高的抑制作用大于对根长的抑制作用。更多还原

【Abstract】 Sample of kentunky bluegrass(Poa pratensis) collected from different season were extracted by ethanol and water to study the allelopathy of the plant.The results showed that water extracts had stronger inhibiting effect on the seeds germination than ethanol extracts.Ethanol extracts from summer grass had the strongest inhibition on the seeds germination.Inhibiting rate of ethanol extracts from summer grass on four seeds tested were: rape(70.0%) >grain sorghum(63.0%) >radish(56.0%) >wheat(49.3%).The all extracts from the different reasons and solvents had more inhibitive effects on roots than stems.Inhibition of all extracts on rape seedling growth is the strongest.Inhibiting rates on rape seedling growth were all above 90%.The results also showed that diluted ethanol extracts had weaker inhibiting effect,and stronger on the sprout than on the roots.更多还原