水土保持学报2017，Vol.31Issue(2)：7-12,39,7.DOI:10.13870/j.cnki.stbcxb.2017.02.002
坡长和雨强对氮素流失影响的模拟降雨试验研究
Reasearch on the Effect of Slope Length and Rainfall Intensity on Nitrogen Loss in Sloping Land Under Artificially Simulated Rainfall
摘要
Abstract
Soil nitrogen loss caused by slope runoff is one of the important source of agricultural non-point source pollution.In order to investigate the effects of slope length (2 m,3 m,4 m and 5 m) and rainfall intensity (0.65 mm/min,0.69 mm/min,0.83 mm/min,0.85 mm/min,1.01 mm/min,1.20 mm/min,1.37 mm/min,1.54 mm/min,1.68 mm/min and 1.80 mm/min) on runoff producing processes and nitrogen loss,an artificially simulated rainfall experiment was conducted.The results showed that:(1) Under the condition of rainfall,the changing trends of different forms nitrogen concentration in runoff were high in the early stage,then decreased with increasing time,and slowed down at 20 min,and gradually became stable for the final rainfall,and in the end they tended to coincide;(2) Under the same slope length,the loss of different forms of nitrogen increased with increasing rainfall intensity,showing a significant positive correlation.In each rainfall events,the loss of different forms of nitrogen was always the maximal when the slope length was 5 m,and the minimal when the slope length was 2 m;(3) There were very significant correlations between runoff volume and total loss of TN and NO3--N,but the influence on NH4 +-N was weak;(4) The correlation between total loss of TN,NO3--N and slope length,rainfall intensity,runoff volume were very significant,and the significance of the correlation followed the order of runoff volume＞rainfall intensity＞slope length.However,the total loss of NH4+-N was significantly correlated with rainfall intensity only;(5) The influence of slope length,rainfall intensity or runoff volume on the total loss of different forms of nitrogen in the runoff could be described as linear correlation equations,and the significance level was in the order of TN＞NO3-N＞NH4+-N.关键词
模拟降雨/径流/氮素流失/坡长/雨强/径流量Key words
artificially stimulated rainfall/runoff/nitrogen loss/slope length/rainfall intensity/runoff volume分类
农业科技引用本文复制引用
邬燕虹,张丽萍,陈儒章,邓龙洲,范晓娟..坡长和雨强对氮素流失影响的模拟降雨试验研究[J].水土保持学报,2017,31(2):7-12,39,7.基金项目
国家自然科学基金项目(41471221) （41471221）
