摘要
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〈1 605.5 mg/L,悬浮物〈141.63 mg/L,pH值范围为5.2910.28。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。
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 method of constructing regression Logistic equation based on the relationship between the relative electric conductivity（REC） in the leaf and concentration（value）,then the median-lethal concentration（LT50）was determined,so as to determine the upper threshold value.And the result showed that the method of constructing regression Logistic equation based on REC and concentration（value）,then determined the median-lethal concentration（LT50）was resultant feasible and theoretically reasonable,the results showed were consistent with the phenomena of the test completely,thus the method also could be citied to study on adversity conditions of plant endured.The optimal quality indicators of reclaimed water from the median-lethal concentration（LT50）gained from this method were chloride〈531.48 mg/L,residual chlorine〈2.59 mg/L,total salt〈1 605.5 mg/L,suspensions〈141.63 mg/L,pH value between 5.29 and 10.28 respectively.The test outcome extended the application scope of reclaimed water quality indexes practically,and there were guidance meaning to establish the criterion of reclaimed water quality in greenbelt irrigation.
出处
《草业学报》
CSCD
北大核心
2009年第6期31-38,共8页
Acta Prataculturae Sinica
基金
深圳市中水灌溉绿地水质控制指标及安全性评价项目资助
关键词
中水
绿地灌溉
LOGISTIC方程
水质指标
阈值
reclaimed water
greenbelt irrigation
Logistic equation
water quality indexes
threshold
