【摘要】 基于东祁连山高寒牧区饲草不足的现状，为缓解草畜间的矛盾，本试验在天祝高寒地区建植多年生混作禾草地，以祁连山东段2012年建植的3龄禾本科混播人工草地为对象，设置不同混作组合，研究在不同生育时期高寒牧区3龄混播禾草地地上-地下生物量分配模式的动态变化，采用样方法对混作草地的生物量测定后进行综合评价。结果表明：从返青期到枯黄期，3龄混作禾草地地上部分生物量呈现先增高后降低的趋势；地下部分生物量呈现倒“N”型变化趋势。混播处理M1(青海中华羊茅+青海冷地早熟禾+青牧1号老芒麦)全年地下干物质产量、全年鲜草产量和全年干草产量，均表现出明显的生长优势，全年的鲜草产量为40 460kg/hm~2,干草产量为12 347kg/hm~2。通过综合评价得到，混作三组分草地M1可保持较高的生产力，是高寒地区建植人工混作草地的良好选择。更多还原

【Abstract】 Based on the current situation of insufficient forage in the alpine pastoral area of the Eastern Qilian Mountains, in order to alleviate the contradiction between forage storage, the perennial mixed grassland was established in alpine region in this experiment.Taking the 3-year-old gramineous mixed artificial grassland established in the eastern Qilian Mountains in 2012 as the object, different mixed combinations were set to study the dynamic change of aboveground-underground biomass allocation mode of the 3-year-old mixed grassland in the alpine pastoral area at different growth stages, and the sample method was used to comprehensively evaluate the biomass of the mixed grassland.The results showed that aboveground biomass increased first and then decreased from green to yellow stage.The underground biomass showed an inverted “N” type change trend.The annual underground dry matter yield, annual fresh grass yield and annual dry grass yield of mixed sowing treatment M1(Festuca sinensis “Qinghai”+Poa crymophila Keng cv.“Qinghai”+Elymus sibiricus “Qinghai No.1”) showed obvious growth advantages.The annual fresh grass yield was 40 460kg/hm~2,and the dry grass yield was 12 347kg/hm~2.The results of comprehensive evaluation showed that mixed grassland M1 could maintain high productivity and was a good choice for artificial mixed grassland in alpine region.更多还原