北京平原区紫花苜蓿建植当年的需水规律

The Water Requirement Regularity of Alfalfa in the Establishment Year in Beijing Plain

采用小型蒸渗仪法研究了北京平原区中苜1号和WL323紫花苜蓿建植当年的需水量、需水强度及行间蒸发占蒸散量的比例。结果表明:中苜1号和WL323全生长季的需水量分别为909.2mm和928.0mm,两个品种之间差异不显著;不同茬次之间差异显著(P<0.05),第2茬最低,第3茬最高。中苜1号和WL323全生长季的需水强度分别为4.4mm/d和4.5 mm/d,两个品种之间差异不显著;不同茬次之间差异显著(P<0.05),第2茬最高,第1茬最低。中苜1号和WL323全生长季行间蒸发占蒸散量的比例分别为26.0%和25.5%,两个品种之间差异不显著;不同茬次之间差异显著(P<0.05),第2茬最高。

The water requirement(WR),water requirement rate(WRR) and the ratio of soil evaporation to evapotranspiration(R_(E/ET)) of Zhongmu No 1 and WL323 alfalfa(Medicago sativa L.) in the establishment year in Beijing plain were studied with micro-lysimeter.The results showed that the WRs of Zhongmu No 1 and WL323 were 909.2 and 928.0 mm,respectively,in the whole growth season and there were no differences between varieties.The WRs in different harvests were evidently different(P<0.05),and the 2nd harvest was lowest but the 3rd harvest was highest.The WRRs in the whole growth season of Zhongmu No 1 and WL323 were 4.4 and 4.5 mm/d,respectively,and there were no differences between varieties.The WRRs of different harvests were evidently different(P<0.05),and the 2nd harvest was lowest but the 1st harvest was highest.The R_(E/ET) in the whole growth season of Zhongmu No 1 and WL323 were 26.0% and 25.5%,respectively,and there were no differences between varieties. The WRRs of different harvests were evidently different(P<0.05),and the 2nd harvest was highest.