Abstract: Under full irrigation and under irrigation conditions in the field,the evapotranspiration (ET) and clipping yields of Kentucky bluegrass,tall fescue and perennial ryegrass were investigated by the microlysimeter method.The experiment was conducted in five measuring cycles during 18th April to 22^nd August.The results indicate that the ET of three turfgrasses in different water conditions was different significantly (P<0.05) in the all five cycles,but the ET among different turfgrasses did not show stable and significant difference in different environments.In the early time,the maximum ET happened in perennial ryegrass,but in other times,tall fescue consumed the maximum ET.Clipping yields of the turfgrasses in each individual cycle were not different significantly between the two soil water treatments,but the total clippings of the five periods were different significantly (P<0.05).With the seasonal environmental changes,different turfgrasses showed their own pattern of clipping yields.In addition,the yearly reasonable water supplement for irrigation of the three turfgrasses in Beijing has been estimated based on the current measuring results.

Key words: Soil water condition, Kentucky bluegrass, Tall fescue, Perennial ryegrass, Evapotranspira tion, Clipping yields

摘要： 研究不同供水条件下,草地早熟禾、高羊茅和多年生黑麦草从4月中旬到8月下旬蒸散量和草屑积累量的变化.结果表明,不同水分处理对供试草种蒸散量的影响差异显著,但草种间的差异与环境有关.多年生黑麦草在早期(4～5月)蒸散量较大,高羊茅6～8月较大.各周期水分处理对草屑积累量的影响不显著,但其累积效应差异显著,草种间草屑积累量的差异不稳定,这与其生物学特性和生长期有关.另外,根据测定结果,对供试草种全年耗水量及合理灌溉量进行估算.

关键词: 水分条件, 草地早熟禾, 高羊茅, 黑麦草, 蒸散量, 草屑积累量