作　　者： ; ; ; ; ;

机构地区： 教育部

出　　处： 《水土保持学报》 2009年第4期91-95,共5页

摘　　要： 通过田间试验,研究了不同灌溉量和灌溉次数3年生紫花苜蓿的耗水特性、生物量和水分利用率,结果表明:不灌溉的G0处理的总耗水量显著低于不同灌溉量的G2-G6处理,但不灌溉更能充分发挥降水和土壤贮存水的作用。各个处理出苗至分枝期的耗水强度略大于分枝期至现蕾期和现蕾至开花期,3个生育期0-120 cm土层土壤体积含水量随着灌溉量的增加而增大,120-200 cm土层土壤体积含水量和灌溉量相关性很差。灌溉量超过175 mm和低于100 mm的处理对苜蓿生物量的形成产生负效应。灌溉量均为100 mm的G2和G3处理,G3的生物量要高于G2的27.37%,G5处理生物量最高,但是和G3处理没有显著差异。各处理间生物量水分利用效率和灌溉利用效率均以G3最高,分别高于G5的37.72%和64.76%,说明G3这种灌溉组合是兼顾高产和节水的最佳灌溉方式。 Field experiment was conducted to study the effects of irrigation amount and times on the water consumption characteristics, biomass and water use efficiency of 3-year alfalfa. The results showed that the water consumption of non-irrigation was significantly lower than the irrigation treatments G2 to G6, but nonirrigation could give full play to the rainfall and soil water amount role. The water consumption per day in recovering to branching period was slightly larger than the branching to squaring period＇s and the squaring to flowering period＇s, and the soil volumetric moisture content of the layer from 0 to 120 cm increased with the rise of irrigation amount, but the relativity between irrigation amount and the soil volumetric moisture content of the layer from 120 cm to 200 cm was poor. The treatments which were irrigated more than 175 mm or lower than 100 mm would have a negative effect on the biomass formation of alfalfa. The biomass of treatment G3 was higher 27.37 percent than the treatment G2＇s, which were all irrigated 100 mm. The biomass of treatment G5 was the highest, but it had no significant difference with the treatment G3. The biomass water use efficiency and irrigation water use efficiency of treatment G3 were all the highest from treatment GO to treatment G6, and they were 37.72 and 64.76 percent higher respectively than treatment GS＇s, it showed that the irrigation combination of treatment G3 which considered to high yield and water saving was the best irrigation method.

关 键 词： 紫花苜蓿 灌溉量 灌溉次数 耗水特性 生物量

领　　域： [农业科学] [农业科学] [农业科学]