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Soil Organic Matter and Nitrogen Losses by Erosion in Little Catchment Model as Effected by Vegetation Coverage

Zhang Xingchang Shao Mingan (State Key Laboratory of Soil Erosion and Dryfarming on Loess Plateau, Yangling,Shaanxi 712100)  
The Zhifang gully catchment,which model was established by 1∶400 scales,has area of 8.27km 2.Under controlling artificially rainfall with intensity of 2mm/min and lasting 30min,the soil erosion and N loss of catchment model was studied for revealing the catchment N loss in runoff and sediment as effected by vegetation cover ratio.The results show that loss amounts of runoff ammonium and nitrate in vegetation cover ratios of 60%,40%,20% and 0%,were 58.08,44.31,25.16,13.71kg/km 2 and 85.50,74.06,63.95,56.23kg/km 2 respectively,the loss amounts of sediment organic matter and total N were 15.67,24.02,44.68,164.87t/km 2 and 0.81,1.18,1.98,7.51t/km 2 respectively.With delay of runoff yield time,the nitrogen concentrations in runoff and sediment drop off,whereas,the accumulation amounts of nitrogen loss rise gradually.Vegetable cover on soil is an available method to control soil erosion and total N loss,nevertheless,it might enhance soil available N loss.
【Fund】: 中国科学院重大研究项目! KZ951 -B1 -2 1 1;; 国家自然科学基金! ( 49871 0 4 9);; 中国科学院“西部之光”人才培养项目
【CateGory Index】: S157
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