确定侵蚀细沟土壤临界抗剪应力的REE示踪方法
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* 教育部科学技术研究重大项目(ZD01-10);中国科学院“引进国外杰出人才”项目(982602)资助


A METHOD FOR DETERMINING CRITICAL SHEAR STRESS OF SOIL IN ERODING RILL WITH REETRACERS
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    摘要:

    近年来兴起的REE示踪方法,可以研究土壤侵蚀的发生和发展的过程,及其沿坡面变化的规律.本研究采用Dy、La、Sm、Yb、Ce、Eu、Nd、Tb等8个REE、3个雨强(50mm h-1,100mm h-1和150mm h-1)和4个坡度(8.74%,17.63%,36.4%和46.63%)进行了一系列人工模拟降雨试验,展示了土壤侵蚀沿坡面变化与坡面细沟发展的关系,分析了土壤表面水流动力特征与土壤侵蚀之间的动态平衡.由土壤侵蚀沿坡面的变化,确定了土壤细沟侵蚀发生的临界距离,并由此得到侵蚀细沟土壤临界剪应力.对不同试验条件下最大细沟侵蚀率与径流剪应力和细流力之间的关系进行了回归分析.

    Abstract:

    In recent years,the tracing method of rare earth element(REE)has been used to study the dynamic processes of soil erosion,such as its initiation,development and distribution upon the hill slope.A series of laboratory rainfall simulation experiments were conducted with eight REEs,namely Dy,La,Sm,Yb,Ce,Eu,Nd and Tb.The experiments involved 3 rainfall intensities:50 mm h-1,100 mm h-1 and 150 mm h-1;4 slope gradients:8.74%,17.63%,36.4% and 46.63%,with 3 replicates.The REE experiments revealed soil erosion distribution and its relation to the development of eroding rills.Analysis was made to relate the fluctuation in soil erosion upon the slope to the energy in the runoff flow.With quantitative determination of soil erosion along slope by REE tracers,the critical distance at which rill erosion initiated was determined,and the critical shear stress of soil were estimated accordingly.Regression analyses of maximum rill detachment rate and shear stress and stream power of runoff were made.

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唐泽军,雷廷武,张晴雯,赵军.确定侵蚀细沟土壤临界抗剪应力的REE示踪方法[J].土壤学报,2004,41(1):28-34. DOI:10.11766/trxb200303020105 Tang Zejun, Lei Tingwu, Zhang Qingwen, Zhao Jun. A METHOD FOR DETERMINING CRITICAL SHEAR STRESS OF SOIL IN ERODING RILL WITH REETRACERS[J]. Acta Pedologica Sinica,2004,41(1):28-34.

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  • 收稿日期:2003-03-02
  • 最后修改日期:2003-08-02
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  • 在线发布日期: 2013-02-25
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