摘要
为探讨自然降雨条件下,农田地表径流及氮素的流失特征,以澄江尖山河流域典型坡地为研究对象,采用标准径流小区和微型试验小区的研究方法,对农田地表径流及径流中氮素流失进行了分析研究。结果表明:降雨量和降雨强度是产生地表径流的主要原因,雨季应做好坡地的保护工作;地表径流中氮素流失的最高浓度可达到30.72mg/L;农田地表径流中可溶态氮素的流失形态主要为硝态氮和铵态氮,硝态氮流失浓度约占全氮的4%～28%,而氨态氮流失浓度约占全氮的1%～8%;地表径流中氮素累积流失负荷在0.45～1.18kg/hm2,而流失系数仅为0.10%～0.12%。
In the present study,we studied the characteristics of nitrogen loss in the slope farmland surface runoff under the natural rainfall conditions through the standard runoff plots and micro-plot methods in the Jianshan River Basin in Chengjiang county.The results showed that the quantity and intensity of rainfall were the main factors causing surface runoff.Therefore,some precaution measures should be done in rainy seasons.The maximum nitrogen concentration in surface runoff reached to 30.72mg/L.Nitrate-nitrogen occupied l4%～28%of total nitrogen loss,whereas ammonia-nitrogen accounts only 1%～8%of total nitrogen loss.In conclusion,the accumulative total nitrogen loss in surface runoff was 0.45～1.18kg/hm2,and the loss coefficient was only 0.1%～0.12%.
出处
《水土保持研究》
CSCD
北大核心
2010年第4期19-23,共5页
Research of Soil and Water Conservation
基金
国家自然科学基金项目(30660037)
云南省自然科学基金项目(2006D0041M)
云南省科技计划项目(2006SG20)
西南林学院水土保持重点学科
关键词
自然降雨
地表径流
氮素流失
natural rainfall
surface runoff
nitrogen loss
