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Advances in Earth Science  2000, Vol. 15 Issue (5): 576-582    DOI: 10.11867/j.issn.1001-8166.2000.05.0576
①Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;②Department of Municipal and Resources Sciences,Nanjing University,Nanjing 210093,China
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The 137Cs  tracer technique has been widely used in the estimate of water-induced soil erosion rate representing a long term. There are two key problems calling for scientific solutions to practical utilization of this technique. One is the determination of reference value of 137Cs content of soil having experienced neither erosion nor deposition, and the other is the establishment of the quantitative model between the amount of 137Cs lost from the soil profile and the rate of soil loss. The primary existing quantitative model was reviewed in this paper, and their limitations were also revealed. These models fell into two categories, namely, empirical model and theoretical model, among which the mass-balance models are relatively reliable because they involved considerations of many factors related to the soil erosion process, such as annual fractions of 137Cs fallout input, the grain size selectivity associated with soil erosion and sediment transport processes, surface enrichment,137Cs  loss due to soil erosion prior to the tillage operation, and etc. The needs of some further improvements of existing models and some additional intensive works were also suggested in this paper.

Key words:  Rate of soil erosion      137Cs      Quantitative model      Mass-balance model.     
Received:  03 January 2000      Published:  01 October 2000
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TANG Xiang-yu,YANG Hao,ZHAO Qi-guo,LI Ren-ying,ZHU Zhen-hua,PU Li-jie. REVIEW OF PROGRESSES IN APPLICATION OF137Cs TRACER TECHNIQUE TO THE ESTIMATE OF SOIL EROSION. Advances in Earth Science, 2000, 15(5): 576-582.

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