再生水灌溉草坪有关指标限值的确定

通过对天津地区常用景观草坪草———高羊茅的水培试验和盆栽试验,得出了再生水用于灌溉的3个关键指标的限值。结果表明,随着再生水全盐量及余氯、悬浮物浓度的增加,苗期高羊茅的生物量、光合速率、叶绿素总量均有不同程度的下降,过氧化氢酶活性则呈先上升后下降的规律;采用再生水灌溉高羊茅时应满足:全盐量<1900mg/L,余氯<1.0mg/L,悬浮物<30mg/L。

Determination of Index Limit for Lawn Irrigation with Reclaimed Water

By means of experiment on water culture and pot culture of landscape lawn-Festuca arundinacea in Tianjin, the limit values of three key indexes about the landscape irrigation with reclaimed water were obtained. It is indicated that along with the increase of total salt, residual chlorine, and SS concentration in reclaimed water, the biomass, photosynthetic rate, and total content of chlorophyll in seeding stage of Festuca arundinacea are reduced to varying extents, and the activity of catalase rises firstly and then drops down. Use of reclaimed water for irrigation of Festuca arundinacea shall meet the following limit values: salt content < 1 900 mg/L, residual chlorine < 1.0 mg/L,SS < 30 mg/L.