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对黄淮海平原典型集约农区N肥污染地下水的初步调查表明,该区地下水硝酸盐(NO_3~-)污染较严重,高产农区和高产田块污染程度明显高于中低产匹和中低产田块;菜地污染程度较粮田严重;随着施N时间的推移和施用量的增加,地下水中硝态氮具有明显的积累趋势,潜在污染不容忽视;地下水NO_3~-含量与N肥施用量呈明显正相关关系。
The preliminary investigation of N fertilizer-contaminated groundwater in the typical intensive agricultural area of Huang-Huai-Hai Plain shows that the pollution of groundwater nitrates (NO 3 - -) in this area is more serious. The pollution of high-yielding agricultural areas and high- The soil pollution level is more serious than that of grain field. With the increase of N application time and amount of applied N, the nitrate nitrogen in groundwater tends to accumulate. Potential pollution can not be neglected. The relationship between NO_3 ~ Was significantly positive correlation.