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Soil Nitrogen Losses of Catchment by Water Erosion as Affected by Vegetation Coverage

Zhang xingchang,Liu Guobin,Fu Huifang(Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shanxi Province 712100,China)  
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 coverage.The results show that loss amounts of runoff ammonium and nitrate were 87.08,44 31,25 16,13 71kg/km 2 and 85 50,74 05,63 95,56 23kg/km 2 respectively in vegetation cover ratios of 60%,40%,20% and 0%.The loss amounts of sediment organic matter and total N were 15.67,24.02,44.68,164.87t/km 2 and 0 18,1 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 mineral nitrogen loss.
【Fund】: 国家自然科学基金!项目 (49871 0 4 9) ;; 中国科学院特别支持项目!(K2 95T- 0 4 - 0 1 ) ;; 中国科学院重大研究 项目!(KZ951 - B1 - 2
【CateGory Index】: X173
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