绿色农产品灌溉水质分析——以榆林市境内无定河流域为例

Water Quality Analysis of Green Agricultural Products Irrigation——a case Study of Wuding River Basin in Yulin City

无定河流域是榆林市最大的流域,是沿线农业灌溉用水的重要水源,依据《绿色食品产地环境质量》(NYT 391—2013)标准中农田灌溉水中各项污染物浓度限值要求,应用两种方法对2012—2018年榆林市境内无定河流域的水环境进行分析评价,并对该区域水质历年变化趋势进行了分析研究。结果表明:两种评价方法相互弥补,单因子指数法确定pH为超标因子,地表水的水质整体偏碱性,综合污染指数介于0.63~0.86,水质为尚清洁水平,流域内水质基本适宜绿色农产品生产;随着时间变化虽有波动性变化,但长期而言趋于稳定。农业灌溉时,应加大水环境监测力度,及时掌握水质,研究发展趋势,政府及相关部门应制定合理的水资源管理措施。

Wuding River Basin is the largest basin in Yulin City,and it is an important water source for agricultural irrigation water along the line.According to the limits of pollutant concentrations in farmland irrigation water in《Green Food-Environmental Quality of Production Area》(NYT391-2013)standard,two methods were used to analyze and evaluate the water environment of Wuding River Basin in Yulin City from 2012 to 2018,and the change trend of water quality in the region was analyzed.The results show that the two evaluation methods make up for each other.The single factor index method determines that pH is the over-standard factor.The surface water quality is generally alkaline,and the comprehensive pollution index is between 0.63~0.86.The water quality is still clean,and the water quality in the basin is basically suitable for the production of green agricultural products.Although there is a fluctuation change over time,it tends to be stable in the long run.In agricultural irrigation,the water environment monitoring should be strengthened,the water quality should be mastered in time,the development trend should be studied,and the government and relevant departments should formulate reasonable water resources management measures.