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《Journal of Basic Science and Engineering》 2010-05
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Influence of Slope and Rainfall Intensity on the Rare Earth Elements and Phosphorous Loss from Soil with Surface Runoff

LIANG Tao1,WANG Lingqing1,HU Yayan2,CHONG Zhongyi1,WANG Weili1,Cao Hongying1,P.Kleinman3(1.Institute of Geographic Sciences and Natural Resources Research,Beijing 100101,China;2.School of Geography science,Nanjing Normal University,Nanjing 210097,China;3.USDA-ARS,Pasture Systems and Watershed Management Research Unit,University Park,PA 16802-3702)  
Through artificial rainfall experiments,characteristics of exogenous rare earth elements and P loss with surface runoff(both in the water and sediment)during simulated rainfall were investigated under the conditions of various slope gradient(5°,10°,15°,20° and 25°)and different rainfall intensity(43mm/h,83mm/h and 115mm/h).Results showed that majority of rare earth elements(Nd、Ce、La)and phosphorous transport with the soil particles in runoff,which was more than 92%.The total amount of rare earth elements and phosphorous loss in runoff were correlated significantly.Under the different rainfall intensity conditions,loss amounts of rare earth elements and phosphorous were showing a parabola type relation and increasing with the slope gradient.There was a turning point when the slope gradient increased to some extent and the critical gradient ranged from 22° to 26°.
【Fund】: 国家自然科学基金项目(40871225 40571146);; 中科院高级学者短期访问项目
【CateGory Index】: S153
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