CAJ | 학술논문

采用野外径流小区对紫色土丘陵区2013年4次典型降雨产流事件进行了监测，研究了不同坡度下地表径流和壤中流产流及氮素流失特征。结果表明：自然降雨条件下，地表径流与壤中流径流量随坡度的增加呈先增大后减小的趋势。径流方式对紫色土坡耕地径流氮素质量浓度和排放通量具有明显影响。壤中流中的总氮排放浓度与氮流失通量在不同降雨条件不同坡度下的变化趋势与壤中流径流量的变化一致。在不同坡度下，壤中流中的氮素浓度比地表径流低，但氮排放通量是地表径流的1．15～4．18倍，以壤中流形式形成的氮素损失是紫色土坡地氮素迁移的主要方式。紫色土坡地径流量和径流中流失的氮浓度及通量都存在一个临界坡度值。研究结果可为调控长江上游紫色土丘陵区氮素流失提供参考。
채용야외경류소구대자색토구릉구2013년4차전형강우산류사건진행료감측，연구료불동파도하지표경류화양중유산류급담소류실특정。결과표명：자연강우조건하，지표경류여양중류경류량수파도적증가정선증대후감소적추세。경류방식대자색토파경지경류담소질량농도화배방통량구유명현영향。양중류중적총담배방농도여담류실통량재불동강우조건불동파도하적변화추세여양중류경류량적변화일치。재불동파도하，양중류중적담소농도비지표경류저，단담배방통량시지표경류적1．15～4．18배，이양중류형식형성적담소손실시자색토파지담소천이적주요방식。자색토파지경류량화경류중류실적담농도급통량도존재일개림계파도치。연구결과가위조공장강상유자색토구릉구담소류실제공삼고。
In order to better understand the characteristics of runoff and nitrogen loss in the slope cropland of purple soil under differ-ent slopes ,four rainfall-runoff events were monitored by using field runoff observation method in the hilly area of Sichuan Basin in 2013 .The results indicated that the discharges of overland flow and interflow increased first and declined then at a critical slope gra-dient with slope gradient increasing at natural rainfall .Concentrations and the flux of nitrogen were greatly affected by overland flow and interflow process .Concentration and flux of nitrogen in interflow were both significantly interrelated with the discharge of inter-flow under different rainfall and slope gradients .Nitrogen concentration in interflow was less than that in overland flow .However , the transport load of nitrogen in interflow was 1 .15~4 .18 times more than that in overland flow because the percentage of interflow accounting for total runoff was much higher .It indicated that interflow was the main transport pathway of nitrogen .There existed critical slope gradients in which plots the discharge of overland runoff and interflow achieved maximum in the four rainfall-runoff e-vents ,as well as the concentration and flux of nitrogen .This research provides a reference for the non-point source pollution control in the hilly area of purple soil .