论文在盆栽条件下,研究了再生水灌溉对苜蓿(Medicago sativa L.cv.‘Algonquin’)生长及养分吸收的影响。试验设置了清水、再生水两种灌水类型,高、中、低3个不同灌水水平。结果表明:同一灌水类型条件下,苜蓿植株生长高度随灌水量减少而降低,同一灌水水平下,灌溉水类型对植株高度无明显影响;不同的灌水水平对植株侧枝数的影响差异不显著,但灌溉水类型对植株侧枝数影响差异显著,所有处理中再生水高水平灌溉侧枝数增幅最大;与清水相比,再生水灌溉能显著增加苜蓿干物质产量;在苜蓿生长前期,再生水灌溉对苜蓿根系生长具有阻碍作用;灌溉水类型对苜蓿植株体内吸收氮、磷、钙、镁吸收量的影响主要在其生长前期,灌溉水类型对苜蓿体内钾含量无明显影响。

Alfalfa(Medicago sativa)is the dominant forage type in China and the shortage of water resources is the limiting element that influences its production.Reclaimed water is a valuable substitute water resource for forage irrigation.The influence of reclaimed water irrigation on the growth and nutrient up-take of alfalfa(Medicago sativa L.cv.'Algonquin')was studied by potted plants.Two water types(fresh vs.reclaimed) and three irrigation levels(high-,middle-,and low-)of water amount were used to irrigate alfalfa.The result showed that the growth height was positively related to the level of irrigation regardless of water types.Water type had significant effect on the number of side branches,highest increase was found under high-level irrigation of reclaimed water.Reclaimed water significantly increased the first-year hay production in comparison to fresh water.In the growth prophase of alfalfa,the root growth of alfalfa was negatively related to reclaimed water irrigation.The effect of irrigation water types on alfalfa absorbing N,P,Ca and Mg was mainly in the growth prophase of alfalfa while that of irrigation water types on alfalfa absorbing K was not significant.