潇河灌区污灌条件下重金属污染的变化特征研究

A Study of Heavy Metal Pollution under Sewage Irrigation ConditionS in Xiaohe Irrigation Area

利用污水灌溉是解决灌溉水资源危机的重要手段之一,但是重金属污染物对土壤的影响一直是备受关注的问题。以潇河灌区典型污水灌溉区为研究对象,对选定区域土壤进行剖面取样、样品分析以及灌溉用水中的重金属含量的分析来确定灌溉用水对于土壤中重金属含量分布的影响。结果表明:灌溉用水作为土壤重金属来源之一会对土壤重金属在垂直方向上的分布规律有一定影响;潇河灌区中河灌区的重金属含量普遍要大于污灌区重金属含量;潇河灌区中除重金属镉有少量超标以外,其他五种重金属含量均在标准范围以内且处于较低水平;只要对污水进行有效处理,污水完全可以取代地下水及河水用于农业灌溉中,将大力缓解灌溉水资源的危机。

Waste water irrigation is an important way to solve the crisis of Irrigation water resources. The influence of heavy metal pollutants on the soil has been the focus of people＇s attention. This paper takes typical the sewage irrigated area in Xiaohe Irrigated Area as the research object, profile sampling. A sample analysis is made of heavy metal content irrigation water on the selected area to determine the influence of irrigation water on the distribution of heavy metal content in the soil. The results show that： irrigation water as a source of soil heavy metals have effect on vertical distribution law of soil heavy metals; the heavy metal content of river ir- rigation area is much bigger than the sewage irrigation areas in Xiaohe Irrigation Area. Except that the heavy metal cadmium exceeds the standard a little, the other five kinds of heavy metal content are all in the standard range and low level. If the effective treatment of wastewater sewage can completely replace groundwater and river water used for agricultural irrigation, it will greatly ease the crisis of the irrigation water resources.