论文部分内容阅读
田间污灌模拟实验及污灌区和非污灌区土壤、地下水中氮、磷含量的调查和对比分析表明，污水中含量高的氮、磷能显著提高土壤肥力，污灌区作物长势良好，但土壤中积累的氮和磷是污灌区地表水和地下水的潜在污染源．虽然土壤对ＮＨ＋４离子有很强的吸附、截留和转化作用，但含量高的ＮＨ＋４离子能缓慢下移，并在上层潜水中积累．污灌和降雨能淋溶土壤中经硝化作用产生的ＮＯ－２和ＮＯ－３离子，造成地下水的污染．饱和污灌３个月后，浅层地下水中的ＮＯ－２和ＮＯ－３离子仍严重超标．
Field sewerage simulation experiments and soil and groundwater irrigated and non-sewage irrigated areas of nitrogen and phosphorus survey and comparative analysis showed that high levels of nitrogen and phosphorus in sewage can significantly improve soil fertility, sewage irrigation area growing well, but the soil Accumulation of nitrogen and phosphorus is a potential source of contamination of surface water and groundwater in sewage irrigation areas. Although soil strongly adsorbs, intercept and transform NH + 4 ions, NH + 4 ions with high content can slowly move down and accumulate in the upper submerged. Sewage irrigation and rainfall can leach nitrification of NO-2 and NO-3 ions in the soil, causing groundwater pollution. After three months of saturated sewage irrigation, NO-2 and NO-3 in shallow groundwater are still seriously over-standard.