淮北平原地下水三氮浓度分布规律及其影响因素分析

对淮北平原浅层地下水103个样品进行三氮及其他相关指标测定分析,揭示该区三氮的空间分布规律、来源及形成机理,并对其影响因素进行分析。结果表明:淮北平原浅层地下水三氮浓度逐年增大,并与其水位埋深呈负相关关系,丰水期的三氮浓度明显大于枯水期。农业含氮肥料的过量使用和流失是导致该区三氮浓度增高的主要原因。此外,三氮浓度还受到包气带的厚度大小的影响,pH值的变化范围、溶解氧浓度的高低也影响着三氮的转化方向和速度,高浓度的Fe2+是导致局部NO2--N严重超标的重要因素。

Distribution and analysis of factors influencing three nitrogen compounds in groundwater of Huaibei Plain

Based on the measurements of three nitrogen compounds and other related indicators from 103 shallow groundwater samples taken in the area of the Huaibei Plain,the spatial distribution of the three nitrogen compounds,the source,and the formation mechanisms were revealed and their factors were analyzed.The results showed that the concentrations of the three nitrogen compounds in the shallow groundwater of the Huaibei Plain had increased year by year,and were inversely proportional to the depth of the water ta...