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《Resources and Environment in the Yangtze Basin》 2003-02
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WEI Chao-fu, GAO Ming, CHE Fu-cai, OUYANG Jian, LUO Chang-shou, XIE De-ti (College of Resource And Environment, Southwest Agricultural University, Chongqing 400716, China )  
The low-middle yield soils are the most important soil resources in Three Gorges Reservoir Area after the construction of Three-Gorge Project. It is basically guaranteed that the produced potential of these soils are synthetically improved and used, in which the immigrations may live and work in peace and contentment. This paper deals with the level of heavy metals in low-middle yield soils and their effects on wheat uptake in the Three-Gorge Reservoir Area. The results show that the content of Hg, As, Cr, Pb and Cu in low-middle yield soils all falls into the quality standards of soil environment in China, and belongs to the first quality standard of natural backdrop content. The content of Cd and Zn in the soils is higher than the average content in soils and natural backdrop content in China, and falls into second quality standards. The content of heavy metals in the soils are related with types of soil parents, pH value, cation exchange capacity, content of organic matter, amorphous iron and physical clay. The heavy metals in the soils are distributed regionally. The content of all heavy metals in suburbs of Chongqing municipality is higher than in out-suburb. The availability of soil heavy metals is very low. The content of As, Cr, Pb, Zn and Cu in wheat seed grain in the area is lower than permissive standard of heavy metals in food in China and backdrop content in wheat seed grain, but content of Hg and Cd is higher. The content of Cu and Zn in seed is 2 times of those in the stem and leaf. But, contents of Hg, Pb, As, Cr and Cd in the stem and leaf are higher than in the seed.
【Fund】: 重庆市科委中青年专家基金项目“重庆中低产田深度开发模式研究”部分内容。
【CateGory Index】: X833;X173
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