Abstract: The mixture grasslands with three perennial grasses and alfalfa combinations were used to investigate the effects of the composition and intercropping of grass and legume on the yield,yield temporal stability,sustainable yield index and land equivalent ratio. The results showed that the combinations of the grass -legume had a significant effect on grass yield,total grass and legume yield,but the impact on alfalfa yield was not significant. Intercropping significantly affects the total yield,yield temporal stability,sustainable yield index and land equivalent ratio. The grass-legume total yield,grass yield,ratio of grass yield and yield temporal stability of Medicago sativa-Bromus inermis combination were significantly higher than that of the M. sativa-Elymus nutans combination. The sustainable yield index of M.sativa-Phalaris arundinacea combination was significantly higher than that of the Medicago sativa-B.inermis and M. sativa-E.nutans combinations. The alfalfa yield,total yield of grass and legume in the treatment of grass-legume intercropping ratio 1:1 were significantly higher but the ratio of grass yield was lower (14.67%) than that of other mixed ratios. The grass yield and ratio of grass yield (26.02%) in the treatment of grass-legume intercropping ratio 1:2 were significantly higher than that of grass-legume ratio 1:1 and 2:1 treatments,but the total yield was the lowest. According to the current experiment,the optimal intercropping patterns isgrass-legume M. sativa-B. inermis or M.sativa-P. arundinacea at the ratio of 2:2.

Key words: Grass and legume combination, Intercropping pattern, Forage yield, Yield temporal stability, Sustainable yield index, Land equivalent ratio

摘要： 本文以三种禾草与紫花苜蓿（Medicago sativa）混播草地为研究对象，探究了禾豆种类组成和间作方式对禾豆产量、产量稳定性、产量可持续性和土地当量的影响。结果表明：禾豆组合对禾草产量及禾豆总产量影响显著，而对苜蓿产量影响不显著；间作方式对禾草、苜蓿及禾豆产量、产量稳定性、产量可持续性和土地当量均有显著影响；苜蓿-无芒雀麦（Bromus inermis）组合禾草产量、禾豆总产量、禾草产量比和产量稳定性显著高于苜蓿-垂穗披碱草（Elymus nutans）组合；苜蓿-虉草（Phalaris.arundinacea）组合产量可持续指数显著高于苜蓿-无芒雀麦和苜蓿-垂穗披碱草组合；豆禾1：1处理苜蓿产量、禾豆总产量显著高于其他处理，但禾草产量比较低（14.67%）；豆禾1：2处理禾草产量及禾草产量比（26.02%）极显著高于1：1和2：1处理，但禾豆总产量最低。在本试验条件下，苜蓿-无芒雀麦或苜蓿-虉草2：2混播组合比较适宜。

关键词: 禾豆组合, 间作方式, 牧草产量, 产量时间稳定性, 可持性产量指数, 土地当量比