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《Journal of Soil and Water Conservation》 2011-01
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Analysis of the Nitrogen Loss Character on the Slopes under Simulating Rainfall Condition

LIU Quan1,2,LI Zhan-bin1,3,LI Peng3,LI Jing3,PENG Yuan-yuan3,ZHANG Xiang3(1.Institute of Water and Soil Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling, Shaanxi 712100;2.Mianyang Normal University,Mianyang 621000;3.Xi'an University of Technology,Xi'an 710048)  
Based on simulating rainfall experiments,the processes of runoff and the nitrogen loss characters on the different slopes were studied under rainfall intensities 1.0 mm/min and 2.0 mm/min separately.The results show that under the conditions of low rainfall intensity,variation of runoff in every process is: 18°28°21°,the runoff peak time is: 21°18°28°,the amount of peak is: 28°18°21°,the synchronize between nitrate leaching and soil erosion,because of the superposition of ammonia nitrogen loss between the top and the lower slope,the peak of ammonia nitrogen loss is occurred,then ammonia nitrogen loss tends to reduce.Under the conditions of strong rainfall intensity,variation of runoff in every process is different,the runoff peak time is: 18°21°28°,the amount of peak is: 28°21°18°.The nitrate loss is mainly carried out by sediment,the nitrate loss on the great slope took place increase steeply,in a short of time,the amount of topsoil loss is increase significantly,which leads to fluctuate of ammonia nitrogen loss.Under the conditions of two rainfall intensities,the total amounts of runoff loss is: 28°21°18°,the nitrate loss is the main form of total nitrogen in runoff.During the course of rainfall,the amount of total nitrogen loss is lower at the preliminary stages of runoff,and which increase at the middle stages of runoff,and which reduce at the last stages of runoff.There are significant linear relationships between the total amounts of different nitrogen patterns loss and runoff.
【Fund】: 国家自然科学基金项目(40771124);; 陕西省自然科学基金重点项目(SJ08-ZD02)
【CateGory Index】: S158
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