Effect of liming and seasonal variation on lead concentration of tea plant (Camellia sinensis (L.) O. Kuntze)

文献类型： 外文期刊

第一作者： Han, Wen-Yan

作者： Han, Wen-Yan;Shi, Yuan-Zhi;Ma, Li-Feng;Ruan, Jiang-Yun;Zhao, Fang-Jie

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关键词： Pb contamination;Pb uptake;tea;liming;acidic soils;HEAVY-METAL CONCENTRATIONS;SEWAGE-SLUDGE;CONTAMINATION;WHEAT;SOILS;CROPS

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

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收录情况： SCI

摘要： Tea is a widely consumed beverage. However, recent studies revealed that there were an increasing number of cases of tea products exceeding the former maximum permissible concentration (MPC) in China for Pb (2 mg kg(-1)). Tea Pb contamination is an issue affecting trade and consumer confidence. Root uptake of Pb could contribute significantly to Pb accumulation in tea leaves due to the strong acidity of many tea garden soils. We conducted pot and field experiments to evaluate the effect of liming on Pb uptake by tea plants on two highly acidic soils (pH 3.6). Additions of CaCO3 significantly increased soil pH by up to 1 unit and decreased soil extractable Pb by up to 32%. Liming resulted in a decrease in the proportion of Pb in the exchangeable and carbonate-bound fractions, with a concurrent increase in the fractions bound to Fe/Mn oxides and residues. Liming significantly decreased Pb concentrations of fine roots, stems and new shoots of tea plants in the pot experiment. In the field experiments, the effect of liming was not significant during the first year following CaCO3 application, but became significant during the second and third years and Pb concentration in the new shoots was decreased by approximately 20-50%, indicating that liming of acidic tea garden soils is an effective way to reduce Pb contamination of tea. The study also reveals a distinct seasonal variation, with Pb concentration in the new shoots following the order of spring > autumn > summer. (c) 2006 Elsevier Ltd. All rights reserved.

分类号： X51

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