Abstract: An experiment,which studied the effect on morphological parameter and physiologica indexl of shading intensities on growth in Kentucky bluegrass,was made from May 1st to November 6th in 2009.The experiment was designed on the basis of many researches made both at home and abroad Many researchers demonstrate that the turfgrass grow worse in the shadow of the high building while it grow better between the low trees.In that case shading intensities is one of the most important influence factors on turfgrass.Six factors(the growth rate,turf quality,weight of grass clipping,SPAD content,relative conductivity,underground biomass of Poa pratensis under drought stress condition) were studied in four treatments on shading intensities.Four treatments contain natural light,slight shading,medium shading and heavy shading.The results showed that the high quality of turfgarass with medium shading could be obtained in dry season,while in rain season the better quality of turfgrass with heavy shading could be achieved.The moderate shading treatment not only could stimulate turfgrass growth and improve leaf color,but it could also reduces the relative conductivity and improve the quality of the turfgrass.Therefore,moderate shading treatment could be regarded as a turf maintenance measure to reduce the damage of hot and drought stress on Kentucky bluegrass turf in summer.

Key words: Poa pratensis, Shading intensity, Turf quality

摘要： 为研究不同遮荫强度对新建草地早熟禾(Poa pratensis)草坪生长状况的影响,于2009年5月1日-11月6日进行试验,共设计自然光照、轻度遮荫、中度遮荫和重度遮荫4种不同遮荫强度,对干旱胁迫下草地早熟禾的生长速率、草坪质量、草屑重量、叶色值、电导率和地下生物量等形态指标和生理指标进行观察测定。结果表明,在少雨时节中度遮荫的草坪质量较高,多雨时节则轻度遮荫的草坪质量较好;适度遮荫下草坪草的生长正常,叶色较好,电导率较小,草坪质量较高。因此,可以利用适度遮荫,减少夏季高温与干旱对草地早熟禾草坪的伤害,改善草坪质量。

关键词: 草地早熟禾, 遮荫强度, 草坪质量