中水灌溉绿地５个主要控制指标上限阈值的确定

 中水运用于绿地灌溉，可以拓宽中水的应用范围，同时对缓解现在城市的水危机具有重要意义。试验以深圳市常见的２种绿地植物———夏堇和金叶假连翘为研究对象，对中水水质中影响绿地植物生长的氯化物、余氯、盐度、悬浮物及ｐＨ 值５个常见指标进行了室内浓度（值）对比试验，通过引用相对电导率拟合Ｌｏｇｉｓｔｉｃ方程，求半致死浓度（值）的方法，确定绿地植物所能耐受的上限阈值。结果表明，用相对电导率的变化拟合Ｌｏｇｉｓｔｉｃ回归方程求半致死浓度作为上限阈值，理论计算结果与试验实际表现基本相符，可以应用在植物逆境胁迫的研究中；通过上述方法求得的适宜用于绿地灌溉的中水水质指标的上限阈值分别是：氯化物＜５３１．４８ ｍｇ／Ｌ，余氯＜２．５９ ｍｇ／Ｌ，全盐量＜１６０５．５ｍｇ／Ｌ，悬浮物＜１４１．６３ｍｇ／Ｌ，ｐＨ 值范围为５．２９～１０．２８。本试验从实践上拓宽了中水水质的适用范围，对于城市中水绿地灌溉水质标准的制定有指导意义。

Determination of the upper threshold value for 5 main control indexes in reclaimed water irrigation

Using reclaimed water for greenbelt irrigation,which can extend the application scope of reclaimed water,and it's also very important to relief crisis caused from the lack of water in the city.2 kinds of familiar greenbelt plants in Shenzhen-Torenia fournieri and Duranta repens.were applied as studying objects,using addition the concentration of chloride,residual chlorine,total salt,suspensions and increasing or reducing pH value into reclaimed water to test the endurance of greenbelt plants,from using the ...