再生水灌溉研究进展

Research advances in reclaimed water irrigation

从再生水灌溉对土壤、作物、地下水和土壤斥水性4个方面简述国内外再生水灌溉的发展概况和研究进展。已有研究表明:再生水灌溉对土壤肥力和土壤酶活性的影响尚未有定论;再生水对农作物生长的影响尚有分歧;再生水灌溉对地下水水质具有一定的影响,并显著影响地下水水环境;长期的再生水灌溉会引发土壤斥水性的产生,且土壤斥水持续时间与土壤有机质质量分数呈正相关。目前存在的问题有:再生水灌溉对土壤和农作物的影响研究不一致,如何消除再生水灌水对地下水和土壤斥水性的影响。认为由于再生水中含有作物正常生长的必要营养元素,若能克服再生水灌溉存在的问题,可缓解淡水资源的压力和减少化肥的使用,避免环境的污染。

Development progress and research advances in reclaimed water irrigation at home and abroad are summarized according to the effects of reclaimed water on soil, crops, groundwater, and soil water repellency. There is no definite conclusion about the effects of reclaimed water irrigation on soil fertilizer and soil enzyme activity, and reclaimed water＇ s effect on crop growth is still controversial. Reclaimed water irrigation has a certain impact on groundwater quality and a significant impact on the groundwater environment. Long-term reclaimed water irrigation may cause soil water repellency, and there is a positive correlation between the soil water repellent duration and soil organic matter content. Existing problems include the difference of opinions upon the effects of reclaimed water irrigation on soil and crops, and determination of a way to eliminate the effects of reclaimed water irrigation on groundwater and soil water repellency. Due to the presence of necessary nutrient elements for crop growth in reclaimed water, reclaimed water irrigation could narrow the gap between the supply and demand of fresh water resources and reduce the use of chemical fertilizer in order to avoid environmental pollution, if the problems mentioned above can be overcome.