Through pot experiment in summer,this paper studies the effect of sowing depth on the germination rate and the effect of sowing density on plant height,plant biomass and total biomass of Elymus nutans,Poa pratensis and Medicago sativa in high-cold area.The results show that the suitable sowing depths of Elymus nutans,Poa pratensis and Medicago sativa are about 2 ～4 cm,2 cm and 1 cm,respectively and there is a negative correlation between seeding density,plant height and plant biomass.The correlation between total biomass and seeding density,plant height and plant biomass is not strong due to composite factors.The suitable sowing density of Elymus nutans and Poa pratensis is about 300 plants · m-2,and Medicago sativa is about 300-500 plants · m-2.%通过盆栽试验,研究在高寒区夏季播种深度对垂穗披碱草、草地早熟禾和紫花苜蓿3种草种的萌发率影响和播种密度对生长期植物高度、单株生物量和总生物量的影响.结果表明:在此研究条件下垂穗披碱草、草地早熟禾和紫花苜蓿的适宜播种深度分别为2 ～4 cm、2 cm和1 cm;播种密度与植株高度、单株生物量之间呈负相关性,总生物量与播种密度、植株高度和单株生物量之间的相关性不强,是综合因素的影响结果;垂穗披碱草和草地早熟禾的适宜播种密度约为300粒·m-2,紫花苜蓿的适宜播种密度约为300 ～500粒·m-2.
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