【摘要】 研究了紫花苜蓿耗水量与叶面积系数、生长高度、干物质积累和地下生物量的关系,探讨了紫花苜蓿的耗水规律,分析了土壤湿度、耗水量对紫花苜蓿生长发育的影响。结果表明,苗期至分枝期是紫花苜蓿的需水临界期;分枝期、开花期耗水量最多,生长速度最大:结实期和成熟期苜蓿耗水量较少,生长较慢,叶面积系数减少。从水分利用率的角度出发,提出了河西走廊紫花苜蓿适宜灌溉量为580mm,为河西地区种植紫花苜蓿,节约水资源,提高水分利用率提供了理论依据。更多还原

【Abstract】 The research was conducted to discover the relationship between water consumption and leaf area index (LAI), plant height, dry matter and underground biomass of alfalfa (Medicago sativa), to discuss the law of water consumption of alfalfa, and to analyze the effect of soil moisture and water consumption on the growth of alfalfa. The results showed that the critical water stage was seedling to branching period, and the most water consumption took place during branching to flowering stage when the growth speed was the fastest. During fruit-setting and maturing period, the water consumption decreased, the growth speed dropped and the leaf area index declined. The appropriate irrigation capacity for alfalfa in Hexi corridor was 580 mm. The study results may provide theoretical basis for alfalfa planting, water resource saving and increasing of water use efficiency.更多还原