河北省环渤海地区地下水硝态氮含量现状及其成因分析

采用野外调查采样与室内分析相结合的方法,对河北省环渤海地区地下水硝态氮的含量现状及影响因素进行研究,并分析了其成因。结果表明：河北省环渤海地区地下水硝态氮含量总体达到国家饮用水Ⅲ类标准,但地区空间变异较大,以秦皇岛地区形势最为严峻。在各种影响因素中,农田利用类型对环渤海地区地下水硝态氮含量影响较大,各类型用地的影响顺序为粮田〉菜地〉稻鱼〉果园,其中硝态氮含量高的样本主要集中在春玉米类农田利用类型上;地貌类型中丘陵对该地区地下水硝态氮含量影响较大;随着水体深度的增加,地下水硝态氮含量呈明显下降趋势。农田污染是导致环渤海地区地下水硝态氮含量升高的主要成因,需要有针对性地进行区域治理。

Analysis on the Current Situation of Nitrate-N Concentration in Groundwater and Its Causes in Bohai Rim of Hebei Province

The current situation and influencing factors of nitrate-N concentration in groundwater in Bohai Rim of Hebei Province were studied using the methods of field investigation and laboratory analysis and its causes were analyzed.The results showed that the nitrate-N concentration came up to the national drinking water Ⅲ class standard,while the spatial variability was great,and the situation of Qinhuangdao was the most severe.Different farm land use types had great influence on the nitrate-N concentration in groundwater,their sequences were grain crop fields〉vegetable plot〉rice-fish〉orchard,and the nitrate-N concentration in groundwater of the spring corn farmland was the highest.Hilly had great influence on the nitrate-N concentration in groundwater.With the increase of water depth,the nitrate-N concentration in groundwater decreased significantly.The farmland pollution was the main reason caused the increase of nitrate-N concentration in groundwater,which should be managed.