磁性示踪条件下坡面土壤侵蚀产流、产沙及侵蚀空间分异特征  

Runoff and Sediment Yield and Spatial Variation of Soil Erosion Slope Under Magnetic Tracing Condition

作　　者：王全辉[1] 胡国庆[1] 董元杰[1] 刘春生[1] 张秀玮[1] 邱现奎[1] 王艳华[1] 

机构地区：[1]山东农业大学资源与环境学院,山东泰安271018

出　　处：《水土保持学报》2012年第2期21-23,28,共4页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(40701094);国家"948"项目(2011-G30);山东省优秀中青年科学家奖励基金项目(BS2009NY025);山东省自然科学基金项目(ZR2009DM043)

摘　　要：在10°,15°,20°坡面上布设磁性示踪剂,通过模拟降雨(60mm/h)研究坡面土壤侵蚀产流、产沙及侵蚀空间分异特征。结果表明,随着坡度增大,坡面产流、产沙量递增;坡面坡度越大,达到稳定产流、产沙的时间点越靠后。10°坡面土壤磁化率降幅以上坡位最大,中坡位其次,下坡位最小;随着坡度增大,坡面土壤磁化率降幅以下坡位最大,中坡位其次,上坡位最小。坡面磁化率变化表明,10°坡面上坡位受到的土壤侵蚀最严重,在15°和20°坡面下坡位土壤侵蚀强度加大。Under simulated rainfall condition,the runoff and sediment yield and spatial variation of 10 degree,15 degree and 20 degree slopes,on which magnetic tracers were placed,were determined.The results showed that,with the increase of the slope degree,the runoff and sediment yield of slopes increased,and the time when the runoff and sediment yield reached stable states were later in the process of rainfall.Soil magnetic susceptibility decreased extent of the top part of the 10 degree slope was the greatest,and the middle part was greater than that in the foot part of the slope.Nevertheless,comparing with the 10 degree slope,the slope magnetic susceptibility trend was changed with the increase of the slope degree.The magnetic susceptibility decreased extents of the foot part of the slopes（15 degree and 20 degree slopes） were the greatest among that of the three parts of the slope.The variation of magnetic susceptibility showed that erosion intensity of the top part of the 10 degree slope was the greatest.However,soil erosion intensity of the foot part of 15 degree and 20 degree slopes increased.

关 键 词：模拟降雨 磁化率 产流 产沙 空间分异 

分 类 号：S157.1[农业科学—土壤学] S153.2[农业科学—农业基础科学]