稻田种植对地表径流污染状况调查研究

以辽宁省营口市水稻种植区为研究区域,通过对监测地块实地调研、资料收集、监测分析,在稻田整个作物生长周期化肥、农药的施加等情况下开展氮、磷污染物对地表径流污染状况的调查研究.结果表明:化肥、农药的施加均会使受纳水体中总磷、总氮质量浓度升高,施肥后总氮质量浓度上升最显著,绿色种植在扣除总氮背景值后达到37.7 mg/L,有...

Investigation on Surface Runoff Pollution Caused by Rice Planting

Taking the rice planting area of Yingkou City in Liaoning Province as the research area,through the field investigation,data collection and monitoring analysis of the monitoring plots,the investigation and research on the surface runoff pollution caused by nitrogen and phosphorus pollutants introduced by the application of chemical fertilizers and pesticides in the whole crop growth cycle of paddy field were carried out.The results showed that:the application of chemical fertilizer and pesticide could increase the mass concentration of total phosphorus and total nitrogen in the receiving water,especially after fertilization.The total nitrogen mass concentration of green planting reached 37.7 mg/L after deducting the background mass concentration of total nitrogen,and that of organic planting reached 19.1 mg/L after deducting the background mass concentration of total nitrogen.At the same time,raising fish and shrimp in paddy field could also increase the mass concentration of total phosphorus and total nitrogen in water quality,which showed that the mass concentration of total nitrogen in fish pond increased significantly from 1.64 mg/L in water injection period to 5.16 mg/L in pond clearing period,and the mass concentration of total nitrogen in shrimp pond changed from 2.44 mg/L in water injection period to 3.15 mg/L in pond clearing period,which was more significant in fish pond than in shrimp pond.The total phosphorus and total nitrogen mass concentration increased,which showed that the effect of fertilization,pesticide application and fish pond cleaning period drainage was greater than that of other periods.In addition,from the perspective of the total content of pollutants in the advance and retreat water of the whole study area,the total phosphorus discharge proportion was 34.7%,the total nitrogen discharge proportion was 46.4%,and the total pollutant discharge proportion was 46.0%,which indicated that the total phosphorus and total nitrogen content in the total drainage had a certain on the whole external environment.