再生水灌溉对草坪草生长的影响

在北京市北小河污水处理厂进行了再生水灌溉草坪草试验,选用3种再生水(二级处理水、一般三级处理水超滤、深度三级处理水反渗透)灌溉6种草坪草(草地早熟禾、高羊茅、多年生黑麦草、匍匐翦股颖、结缕草、野牛草),再加上自来水灌溉作为对比。研究表明：在草坪草生理方面,与自来水对比,二级处理水和一般三级处理水超滤灌溉能显著促进草坪草的生长,较明显地增强草坪草抗性,而深度处理的三级处理水反渗透则不显著,这表明草坪草在再生水灌溉中有非常良好的优势;在草坪草矿质元素含量上,自来水灌溉与再生水灌溉差异很小。土壤中有害的矿质元素,如重金属、氯化物、氟化物等被草坪草大量吸收,通过修剪被移走,从而有效地减轻有害矿质元素对土壤和环境的不良影响。这表明草坪草在修复污染土壤上可能有良好的应用前景。

Influence of Reclaimed Water Irrigation on Turf Growth

The experiment of using reclaimed water to irrigate turf grass was carried out in BeiXiaohe Wastewater Treatment Plant of Beijing. Three kinds of reclaimed water(secondary treated wastewater, general tertiary treated wastewater UF and deep tertiary treated wastewater RO) and tap water (control) were used to irrigate six kinds of common turf grasses ( Kentucky Bluegrass, Tall Fescue, Perennial Ryegrass, Creeping Bentgrass,Zoysiagrass and Buffalograss).The research result showed that in contrast with tap water irrigation, secondary treated wastewater and general tertiary treated wastewater UF can boost growth of turf grass evidently and enhance adversity resistance appreciably, but deep tertiary treated wastewater RO has no these effects. This means that turf grass has great advantage in reclaimed water irrigation .The difference between reclaimed water irrigation and tap water irrigation is small on mineral elements. By absorbing the toxic mineral elements largely in soil and being clipped and transported, turf grass can reduce the negative effect of these mineral elements on soil and environment. This also means that turf grass may have a good prospect on repairing polluted soil.