关键词: 草原学, 草坪, 蒸散量, 水分管理

Abstract: A study of the evapotranspiration rate and water management of the cool-season turfgrasses, Tall fescue and Kentucky bluegrass, from May 2001 to November 2002, and the warm-season turfgrasses, Baffalograss and Zoysiagrass, from April to November 2002, shows that during the whole growth seasons, the evapotranspiration of the four species reached the highest rate twice: in May and in August. Meteorological factors dominated the evapotranspiration rate of the grasses and also interacted with one another. The total evapotranspiration rate of Tall fescue was 831.28 mm in 2001 and 849.33 mm in 2002, which everaged 11.5% higher than Kentucky bluegrass, whose ET rate was 734.51 mm in 2001 and 764.37 mm in 2002. The ET rate difference between Baffalograss (609.82 mm) and Zoysiagrass (612.10 mm) was not obvious,while that between the cool-season turfgrasses and the warm-season species was evident (P<0.05). The statistical sequence of the ET rate of the four species is as follows: Tall fescue>Kentucky bluegrass>Baffalograss=Zoysiagrass. The summer ET rate of the first two species in 2001 was either low or very low. During the whole growth seasons of 2001, Tall fescue needed 621.34 mm irrigation water, and Kentucky bluegrass, 543.88 mm; of 2002,Tall fescue needed 536.85 mm,Kentucky bluegrass 466.13 mm,Baffalograss 332.16 mm, and Zoysiagrass 326.65 mm irrigation water. It was the variable precipitation between 2001 and 2002 that caused the different amount of irrigation water demanded by the species.

Key words: Grassland science, Turfgrass, Evapotranspiration rate, Water management