山东省地下水硝酸盐含量状况及影响因素研究

Nitrate Concentration of Groundwater and Its Affecting Factors in Shandong Province,China

国内外大量研究表明,地下水硝酸盐污染已成为普遍问题。为了摸清山东省地下水硝酸盐污染状况,通过调查取样分析,对本省地下水硝酸盐含量状况及其影响因素进行了研究。结果表明,山东省地下水NO3--N含量总体较低,平均为7.4mg.L-1,仅有2%的地下水超过了我国地下水质量标准（GB/T14848—1993）。地区之间地下水硝酸盐含量有很大的差异,其中临沂市NO3--N含量最高,达10.6mg.L-1。受降雨影响,雨季后地下水硝酸盐含量下降。农田利用类型对地下水硝酸盐含量影响较大,在粮田、设施菜地、露天菜地、果园4种类型中,设施菜地影响最大,NO3--N达到13.1mg.L-1,其次为果园。随着埋藏深度的增加,NO3--N含量呈先升后降的趋势,最大平均值出现在埋深20~50m的地下水中,达8.5mg.L-1。

It was reported from many domestic and overseas studies that nitrate nitrogen（NO-3-N） pollution in groundwater had been a universal problem.As to evaluation the nitrate pollution status of groundwater in Shandong Province,a large-scale investigation and water-sampling analysis on NO-3-N concentration in local groundwater was performed,and the main influence factors of nitrate pollution were studied.The results showed that the average concentration of NO-3-N in groundwater was 7.4 mg·L-1 and only about 2% samples exceeded the criterion of national drinking water quality.In addition,the concentration of NO-3-N varied greatly due to different prefectural-level cities,with maximum concentration of 10.6 mg·L-1 occurred in Linyi City.The average concentration of NO-3-N in groundwater was affected by rainfall and a lower NO-3-N concentration in groundwater was observed after rainy season.The concentration of NO-3-N in groundwater was greatly affected by land using type,and the maximum NO-3-N average concentration of 13.1 mg·L-1 was observed in the protected vegetable land area and the second was in orchard.The concentration of NO-3-N in groundwater was also affected by water-sampling depth,and the maximum NO-3-N average concentration of 8.5 mg·L-1 was observed in the water aquifer lies between 20 m and 50 m depth.There was a variation trend that NO-3-N concentration raised firstly and then declined as water-sampling depth increase.