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以屋顶绿化中主要应用的3种草坪草(草地早熟禾、多年生黑麦草、狗牙根)为试材,分别进行充足灌水与限制灌水处理,对其蒸散量及土壤水分阈值进行研究。结果表明:充分灌水组和限制灌水组试验期内蒸散量均表现为黑麦草>狗牙根>早熟禾,且充分灌水组草坪的蒸散量要大于限制灌水组草坪的蒸散量,得出最佳土壤水分阈值狗牙根为66.0%~82.6%,黑麦草为59.7%~70.3%,早熟禾为62.5%~81.9%,并由此得出狗牙根需补充灌溉5次,每次灌溉量为25.9mm;黑麦草需补充灌溉9次,每次16.5mm;早熟禾需补充灌溉4次,每次30.3mm。
Three kinds of turfgrasses (Kentucky bluegrass, perennial ryegrass and Bermudagrass), which are mainly used in roof greening, were used as experimental materials to study the evapotranspiration and soil moisture threshold. The results showed that the evapotranspiration of the fully irrigated and the restricted irrigated groups were both ryegrass> bermudagrass> bluegrass, and the evapotranspiration of the irrigated turfgrass was higher than that of the restricted irrigated grassland, The water threshold of bermudagrass was 66.0% -82.6%, that of ryegrass was 59.7% -70.3%, and that of Kentucky bluegrass was 62.5% -81.9%. The results showed that bermudagrass need to be replenished five times with 25.9mm of irrigation. Ryegrass need to be irrigated 9 times, each 16.5mm; Kentucky bluegrass need to be irrigated 4 times, each time 30.3mm.