地表生态修复对地下水质的影响研究--以永定河流域北京平原区为例

Effect of Surface Ecological Restoration on Groundwater Quality--Take Beijing Plain Area of Yongding River Basin as An Example

以硝酸盐氮为典型指标,分析其含量变化在平面和垂向上的分布特征及变异规律。结果表明,平面上,2021年相比2011年,研究区地下水中硝酸盐氮含量以基本不变为主;垂向上,10余年来,硝酸盐氮含量第一含水层组波动下降,第二含水层组在波动中略微上升,但上升幅度小于第一含水层组下降幅度,第一含水层组硝酸盐氮含量均值绝大多数年份都高于第二含水层组;变异系数第一含水层组波动下降,第二含水层组较为平稳,且绝大多数年份都小于第一含水层组。第一含水层组硝酸盐氮含量降低说明地表生态修复对地下水质改善具有积极作用。

Taking nitrate nitrogen as a typical index,its distribution characteristics and variation rules in horizontal and vertical of groundwater were analyzed.The results show that,on the plane,the nitrate nitrogen content in groundwater in the study area is basically unchanged in 2021 compared with 2011.In vertical direction,the nitrate nitrogen content in the first aquifer group fluctuated and decreased,while it increased slightly in the second aquifer group,but the increase was less than the decrease of the first aquifer group.The mean nitrate nitrogen content in the first aquifer group was higher than that in the second aquifer group in most years.The variation coefficient of the first aquifer group fluctuates and decreases,while that of the second aquifer group is relatively stable,and is smaller than that of the first aquifer group in most years.The decrease of nitrate nitrogen content in the first aquifer group indicates that surface ecological restoration has a positive effect on the improvement of groundwater quality.