干旱及复水处理下坪用黑麦草和高羊茅抗旱特性比较

本试验以冷季型草坪草高羊茅(Festuca arundinacea)品种凌志（Barlexas）和黑麦草（Lolium perenne）品种首相（Premier）为供试材料，研究其在干旱胁迫和复水过程中的生长、形态指标的变化。结果表明，两种草坪草在干旱胁迫期间叶片相对含水量、叶片水势、蒸散量、土壤相对含水量、草坪质量、生长速率呈明显下降趋势，质膜透性(以相对电导率表示)、萎蔫率呈上升趋势；复水后两草种叶片相对含水量、萎蔫率、叶片水势、生长速率和凌志草坪质量恢复到对照水平，两草种质膜透性、蒸散量和首相草坪质量未恢复到对照水平。胁迫期间凌志各指标可保持较好水平，变化幅度也相对较低，复水期间凌志各指标恢复速度快，复水结束时较多指标恢复到胁迫前水平，说明高羊茅品种凌志的抗旱性及恢复能力优于黑麦草品种首相。

Responses of tall fescue and perennial ryegrass turfgrasses to drought stress and re-watering treatment

Turfgrasses always go through the process of "drought-re-watering-drought-re-watering…" in the growth seasons.It is a good opportunity to examine the growth and morphology responses of turfgrass to drought stress and re-watering treatments.In this study,the responses of Barlexas cultivar of Tall Fescue(Festuca arundinacea) and Premier cultivar of Perennial Ryegrass(Lolium perenne) to drought stress and re-watering treatments were investigated.The results showed that drought stress caused a significant decline in TQ,leaf RWC,LWP,GR,ET,SWC and a significant increase in EL,LW of both cultivars.After re-watering,all the indicators rehabilitated to some degree.Leaf RWC,LW,LWP of both cultivars and TQ of Barlexas reached the same order of control group,however,EL,ET of both cultivars and TQ of Premier do not reached the order of control group.Through the entire experiment,Barlexas showed better performance than Premier,which suggests that Barlexas has a stronger drought resistance and recovery capability than Premier.