再生水灌溉对天津滨海盐碱地绿地土壤的影响

对天津诺维信公司排放出的再生水进行化学评价,确定其水质为重盐碱水,试验中配成的混水水质介于中等水与盐碱水之间.用这两种水分别浇灌天津滨海盐碱绿地土壤,土壤中ESP、SAR、Cl-均比淡水灌溉土壤有显著提升;再生水浇灌的土壤已接近轻度碱化土,且有加深的趋势;混水灌溉土壤较好,但长期灌溉后,也有轻微碱化的趋势.不同植物对再生水浇灌后的反应不同,其中国槐、草坪草耐性较强,暂时不造成危害.用磷石膏修复再生水后,处理水的化学指标达到灌溉水质标准.对于再生水对土壤和植物的影响需注意监测并采取措施进行预防.

Effects of reclaimed water irrigation on the physical and chemical characteristics of saline-alkaline earth in Tianjin.

According to the evaluation of the reclaimed water from Tianjin Novozymes Company, it was strong saline-alkaline water.Diluted mixed water was between normal water and reclaimed water. The seaside saline-alkaline land in Tianjin was irrigated with reclaimed water and mixed water respectively. The results showed that ESP, SAR and Cl~- in the soil were increased compared to the soil irrigated with fresh water. Moreover, the soil irrigated with reclaimed water was close to the light saline-alkaline soil and inclined to severity. The soil irrigated with mixed water was inclined to light alkali. In addition, the responses of different plants irrigated with reclaimed water varied. Due to the fine tolerance to the reclaimed water, no harm was caused on Chinese scholartree and turfgrass for the time being. After repaired with phosphorous plaster, the chemical property of reclaimed water was bordered on irrigation water standard. Therefore, the effect of reclaimed water on soil and plants should be monitored and some actions should be taken when necessary.