2008•Bulletin of Soil and Water ConservationRequires access
Runoff Yield and Pollutant of Barren Grassland Slope Under Simulated Rainfall Condition
Jin Han
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Abstract
A field experiment under simulated rainfall was carried out to assess the characteristics of pollution and runoff yield at five different rainfall intensities on barren grassland slope in Qingshan catchment,Lin'an City,Zhejiang Province.Results showed that runoff volume was positively correlated with rainfall intensity and the correlation coefficient was 0.873 2.Sediment concentration in runoff was not significantly correlated with rainfall intensity.Pollutants ranked in the descendant order of COD,TN,TP,and water-soluble P in terms of concentration and the concentration became smaller and smaller with increased rainfall intensity,which means that rainfall can dilute pollutant concentration.The secondary pollutant modulus of different pollutants was positively correlated with rainfall intensity and the correlation coefficient was above 0.9,which showed that pollutant was bigger with the increased rainfall intensity.