【摘要】 以草原3号杂花苜蓿(Medicago varia Martin.cv.Caoyuan No.3)和蒙农1号蒙古冰草(Agropyron mongolicum Keng.cv.Mengnong No.1)为材料,按四种混播方式在内蒙古多伦县农牧交错区旱作条件下建立混播人工草地,并对不同混播组分的高度、产量和种间竞争关系进行测定分析。结果表明:(1)建植第二年,2行苜蓿+1行冰草、1行苜蓿+2行冰草混播处理的干草总产量显著高于苜蓿单播,但低于冰草单播;(2)建植第三年各混播处理均表现为苜蓿株高显著高于单播,而冰草株高显著低于单播;(3)建植第三年,各种混播处理的干草总产量均显著高于单播,且1行苜蓿+2行冰草混播处理的干草总产量显著高于其他混播处理;(4)各混播处理随建植时间的延长均表现出不同程度的种间互作关系,其中2行苜蓿+1行冰草、2行苜蓿+2行冰草的混播处理更有利于维持混播草地的稳定性。更多还原

【Abstract】 To optimize the sowing modes,the forage yield and interspecific competition of four sowing modes of alfalfa(Medicago varia Martin.cv.Caoyuan No.3)and wheat grass(Agropyron mongolicum Keng.cv.Mengnong No.1.)under dry farming were investigated in farming-pastoral ecotone in Duolun county,Inner Mongolia.The results showed that hay production of the mixtures of 2-row alfalfa with 1-row wheat grass,and mixtures of 1-row alfalfa and 2-rows wheat grass was significantly higher than monoculture of alfalfa,but lower than that of monoculture of wheat grass in the second year of sowing.Hay production from all mixtures with alfalfa and wheat grass was significantly higher than that of both monoculture of alfalfa and wheat grass in the third year of sowing.And hay production of the mixtures of 1-row alfalfa with 2-row wheat grass was the highest among the mixtures in the third sowing year.In addition,it was found that interspecific interaction between alfalfa and wheat grass in the mixtures existed,and the interaction became more evident with increase in cultivation period.The interspecific interaction was more profound in the mixtures of 2-row alfalfa with 1-row wheat grass and the mixtures of 2-row alfalfa with 2-row wheat grass,and can contribute to the maintenance of mixed pasture.更多还原