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为研究不同条件下农田区氮污染和氮转化的过程及结果 ,进行了 4个土柱的模拟实验 .模拟菜田施肥 (化肥 )残存量对地下水氮污染的实验表明 ,土柱中所施化肥残存量的 72 .0 8%和4 7.4 4 %随下渗水流出 .模拟非均质包气带结构对地下水氮污染去除的实验表明 ,装有 4层粘性土夹层的砂柱对硝酸根离子的去除率分别为 85.69% (以蒸馏水混合液注入 )和 32 .4 8% (以地下水混合液注入 ) ,而没有粘性土夹层的砂柱对硝酸根离子的去除率则分别为 38.2 5% (以蒸馏水混合液注入 )和 2 8.92 % (以地下水混合液注入 ) .
In order to study the process and result of nitrogen pollution and nitrogen transformation in farmland under different conditions, four soil column simulation experiments were carried out.The experiment on simulating the nitrogen pollution of groundwater by the fertilization (fertilizer) residual in vegetable field showed that the fertilization 72. 0 8% and 4 7.4 4% of the remaining amount flowed out with infiltration water.Experimental results of simulating the heterogeneity of gas-banding structure to remove nitrogen pollution of groundwater show that the sand column with 4 layers of cohesive soil interlayers has a good effect on nitrate ion The removal rates were 85.69% (injected with distilled water mixture) and 32.48% (injected with groundwater mixture), respectively. The removal rates of nitrate ions by sand column with no clay interlayer were 38.2% Distilled water mixture injection) and 2 8.92% (with groundwater mixture injection).