CAJ | 학술논문

随着化肥施用量的增大，农田径流污染引起的非点源污染问题日益严重.为加强对非点源污染的控制，并为农田径流污染研究提供依据，选取辽河流域玉米地进行小区试验，研究其在自然降雨条件下的径流流失.试验过程中共观测到28场降雨，获得5场出流数据.结果表明，对所选试验地点(坡度5%，种植玉米)，降雨量在29.2 mm以上时可能产生径流，形成非点源污染；在降雨产流条件下，氮、磷次降雨平均质量浓度(ρEMCs )与降雨量和降雨强度没有明显相关关系，总磷的流失量与降雨量呈明显的正相关关系.计算得到此次试验中玉米地的总氮、总磷和 CODcr的输出系数分别为5.46、0.57、25.79 kg·hm-2·a-1.
수착화비시용량적증대，농전경류오염인기적비점원오염문제일익엄중.위가강대비점원오염적공제，병위농전경류오염연구제공의거，선취료하류역옥미지진행소구시험，연구기재자연강우조건하적경류류실.시험과정중공관측도28장강우，획득5장출류수거.결과표명，대소선시험지점(파도5%，충식옥미)，강우량재29.2 mm이상시가능산생경류，형성비점원오염；재강우산류조건하，담、린차강우평균질량농도(ρEMCs )여강우량화강우강도몰유명현상관관계，총린적류실량여강우량정명현적정상관관계.계산득도차차시험중옥미지적총담、총린화 CODcr적수출계수분별위5.46、0.57、25.79 kg·hm-2·a-1.
With extensive use of chemical fertilizers,non-point source pollution caused by agricultural runoff is getting worse.A field experiment was carried out in a cornfield land in Liao River region,to study basic rules of runoff under natural rainfall condition.Twenty eight (28 )rainfall events were observed and runoff data was obtained from 5 of them.It was found that a cornfield gradient of 5% resulted in non-point source pollution and runoff at >2 9.2 mm rainfall.EMC of nitrogen and phosphorus showed no correlation to mean rainfall,but a significant linear correlation between phosphorus loss and rainfall was found.Export coefficients of TN,TP and CODCr were found to be 5.46 、0.57、25.79 kg·hm-2·a-1 respectively.