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《Journal of Tea Science》 2005-03
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Effects of Acidification and Organic Matter Accumulation on Lead Bio-availability in Tea Garden Soils

ZHANG Ming-kui1,FANG Li-ping1,ZHANG Lu-qing2(1.College of Environmental Science and Natural Resources,Zhejiang University,Hangzhou 310029,China;2.Zhejiang Forestry Surveying and Designing Institute,Hangzhou 310020,China)  
The increased accumulation of lead (Pb) in tea is widely concerned.The study on the factors influencing Pb concentration in tea is necessary for the production of high quality tea.In this study,soils of two tea gardens (Yellowish red soil and Red soil) were collected and incubated by adding acid and organic manure for studying the effects of acidification and organic matter accumulation on Pb bio-availability of tea garden soils.Water-soluble Pb,NH4OAc extractable Pb and chemical forms of Pb in the incubated soils were characterized.The results showed that soil acidification promoted transformation of other forms of Pb into exchangeable Pb,and thus increased water solubility and bio-availability of Pb in the soils.Accumulation of organic matter could activate Pb in soils with pH4,whereas accumulation of organic matter decreased Pb bio-availability in lower pH soils (pH4).The effects of pH and organic matter on Pb bio-availability were more significant in sandy soil than that in clayey soil.
【Fund】: 国家自然科学基金(40471064);; 国家重点基础研究发展规划(973)项目(2002CB410804)资助
【CateGory Index】: S571.1
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