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ZHU Jian-ming1,LIANG Xiao-bing1,LING Hong-wen1,LI She-hong1,SU Hong-can2(1.State Key Lab.of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China;2.Maternity and Child-care Center in Enshi Prefecture,Enshi 445000,China)  
Yutangba,one of the most typical high-Se areas in Enshi Prefecture,is located in the northern part of Shuanghe Community about 81 km SE of Enshi City,Hubei Province,China.In order to better understand the origin of high-Se areas and the source of selenium,a comprehensive study in combination with geologic,topographic,climatic and anthropic factors was conducted.The results showed that Yutangba is essentially an almost closed valley-basin and has unique topographic features that have given Yutangba an integral geochemical landscape characterized as being high in Se.Selenium concentrations in Permian Se-rich carbonaceous rocks exposed in the northern part of Yutangba are highest in all Se-rich rocks,even up to 2669.9±809.6 μg·g-1.Se-rich rocks of the Permian Maokou and Wujiaping formations are the source of Se for soils and plants,but the high-Se development of Yutangba landscape,apart from topographic and climatic factors,mainly resulted from human activities such as cultivation manner and mining Se-rich rocks as a fuel or fertilizer,and this impacts on local environment on a long-term scale.So,if Se-rich carbonaceous strata can be a necessary condition for incidence of Se poisoning,human cultivating manner and activities such as mining Se-rich rocks as a fuel or fertilizer will provide a sufficient condition for transportation,bioavailability of Se and its accumulation.Whether primary high-Se areas such as Xintang and Shadi or those developed later,such as Yutangba,once soluble Se is accumulated to a certain extent and suitable environmental conditions exist,Se poisoning would occur again in some places of Enshi Prefecture.
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