Abstract: Among the cultivars of Ken tucky bluegrass,the ET of Dawn and Nuglade was higher than that of S-21,Midnight and Nassau,respectively.The ET difference between Dawn and Nuglade was not significantly,so was the ET difference among S-21,Midnight and Nassau.Under the condition of limited water supply,S-21 and Nassau had the highest water saving ability,which has lower ET,higher relative water content and water potential,higher soil water content and lower soil water tension than the other three cultivars.Dawn and Nuglade had lowest water saving ability.Midnight had medium water saving ability.Deficient soil water content can greatly influence ET of Kentucky bluegrass cultivars,every treatment's ET was less than that of CK.

Key words: Kentucky bluegrass, Evapotranspiration, Water saving ability

摘要： 研究5个草地早熟禾品种的蒸散量及节水性。结果表明,在土壤水分充足,其它条件相同的情况下,Dawn和Nuglade品种的蒸散量大于S-21、Midnignt和Nassau。在水分胁迫下,S-21和Nassau的节水性好,耗水量低,较高的相对含水量和叶片水势,同时土壤含水量变幅小,土壤水吸值小,而Dawn与Nuglade恰好相反,Midnight的节水性介于前两者及后两者之间。

关键词: 草地早熟禾, 蒸散量, 节水性