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Study on the Correlation between 137cs Loss and Soil Erosion in Central Highlands of Vietnam

Journal of Environmental Science and Engineering(A) 2014年第2期3卷 117-122页

作者： Trinh Cong Tu Phan Son Hai Central Highlands Soils Fertilizers and Environment Research Center Buon Ma Thuot 55999 Vietnam Nuclear Research Institute Dalat 61999 Vietnam

isotope of 137cs appeared in the environment by nuclear weapon tests in the atmosphere in the 1950s and 1960s. When the 137cs deposited to the ground, they were absorbed strongly and quickly by exchanging positions with other elements, and it had no ability to decompose in most of the environments. Redistribution of this isotope after settled down into the soil mainly occurs due to redistribution of soil surface. Research on the correlation between 137cs loss and soil erosion was done in 2009, at 24 sites, on basaltic soil with slopes of 20%-25%. Statistical analysis by linear regression of experimental data according to equation ofy = a × xb got coefficients of a and b. They are 20.123 and 1.0967, respectively. The correlation ofy = 20.123 × x1.0967 was tested with error of 7.3%-35.8% between the actual soil loss and calculating. This correlation was applied to evaluate soil erosion rates in two catchments of Buon Yong and Ea Kao belonging to Dak Lak province, thereby giving soil erosion rates ranging from 3.44 t-ha-1 to 26.38 t-ha-1, depending on the conditions of sloping land and cover crops.

关键词： Catchment isotope of 137cs soil erosion standardization.

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