长春地区地下水中含氮化合物的空间分布及预测

根据长春地区地下水中NH⁺₄,NO^-₂,NO^-₃ 3种离子2006年的观测数据, 采用克里格插值方法绘制3种氮离子质量浓度的空间分布等值线, 表明长春地区的西北部和东北部含氮化合物质量浓度变化较大, 其中NO^-₃离子质量浓度在东北至西南方向均明显高于其他地区, 有线状污染的特征, 污水灌溉和过量使用农药、 化肥, 污染物经表层淋失而进入地下水是引起污染的主要原因. 利用时域克里格方法预测了未来两年长春地区地下水中上述3种离子质量浓度的变化趋势, 结果表明, 长春地区地下水水质较好,但亚硝酸盐质量浓度在各个区域均有上升趋势, 环城地区3种含氮化合物质量浓度上升趋势显著.

Spatial Distribution and Forecast of Nitrogenous Compounds in Groundwater in Changchun Area

Firstly the method of Krige analysis was used to draw up the isograms of spatial distribution according to the statistics of NH⁺₄,NO^-₂,NO^-₃ ions in Changchun groundwater in 2006. The densities of the three kinds of nitrogenous compounds changed higher in the northeast and the northwest of the area from the isograms, the density of NO-3 ion was higher clearly from northeast to southwest than the other regions. From the linear form polluted character, it is so pointed out that the main cause was that irrigating the field with polluted water and excessive agriculture chemicals and the pollutant poured into groundwater. The secondly Krige method in a pure time area was used to estimate and appraise the changing trend of nitrogenous compounds, verifying its forecasting function. The result implies the groundwater quality was fairly good in Changchun area, but the density of nitrite moved upward clearly in every area and specially in the area around the city, the consistency of the three kinds of ions changed fairly higher and changing trend would rise, it was connected with human activity and, so it needed to be controlled and prevented.Firstly the method of Krige analysis was used to draw up the isograms of spatial distribution accordingto the statistics of NH⁺₄,NO^-₂,NO^-₃ ions in Changchun groundwater in 2006. The densities of the three kinds of nitrogenous compounds changed higher in the northeast and the northwest of the area from the isograms, the density of NO^-₃ ion was higher clearly from northeast to southwest than the other regions. From the linear form polluted character, it is so pointed out that the main cause was that irrigating the field with polluted water and excessive agriculture chemicals and the pollutant poured into groundwater. The secondly Krige method in a pure time area was used to estimate and appraise the changing trend of nitrogenous compounds, verifying its forecasting function. The result implies the groundwater quality was fairly good in Changchun area, but the density of nitrite moved upward clearly in every area and specially in the area around the city, the consistency of the three kinds of ions changed fairly higher and changing trend would rise, it was connected with human activity and, so it needed to be controlled and prevented.