Influences of charcoal and bamboo charcoal amendment on soil-fluoride fractions and bioaccumulation of fluoride in tea plants
Influences of charcoal and bamboo charcoal amendment on soil-fluoride fractions and bioaccumulation of fluoride in tea plants
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DOI：
10.1007/s10653-012-9459-x
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发表时间：
2012-10-01
影响因子：
4.2
通讯作者：
Wan, Xiaochun
中科院分区：
文献类型：
--
作者：
Gao, Hongjian;Zhang, Zhengzhu;Wan, Xiaochun
茶树中高水平的氟化物对饮茶的人构成了潜在的健康风险。已有研究表明，茶树体内的氟与土壤中的有效氟密切相关。但是，可以用来调节土壤中氟化物有效性的方法却很少见。本研究旨在研究添加木炭和竹炭对土壤氟有效性和茶树体内氟的生物积累的影响。在微型实验中，茶树生长在茶园土壤中，混合了不同数量的木炭和竹炭[即0.5、1.0、2.5和5.0%(w/w)]。采用连续萃取-离子选择电极法测定土壤氟形态和茶树体内的氟积累量。结果表明，添加木炭和竹炭均显著提高了土壤中铁锰氧化物结合氟的浓度，但显著降低了土壤中水溶态和交换态氟的浓度(p<；0.05)。添加木炭和竹炭也显著降低了茶根和茶叶中的氟含量(p<；0.05)。然而，以茶叶中多糖、多酚、氨基酸和咖啡因的含量为指标，添加木炭和竹炭对茶叶品质没有影响。这些结果表明，应用木炭和竹炭可能为降低土壤中氟的有效性和茶树对氟的吸收提供了一种有用的方法。
High levels of fluoride in tea plants pose a potential health risk to humans who drink tea. It has been demonstrated that tea plant fluoride is closely related to the available fluoride in soil. But approaches that could be used to regulate the availability of fluoride in soil have been rarely seen. This study aims to investigate how the addition of charcoal and bamboo charcoal affected soil fluoride availability and bioaccumulation of fluoride in tea plants. In a microcosm experiment, tea plants were grown in the tea garden soil mixed with different amounts of charcoal and bamboo charcoal [that is, 0.5, 1.0, 2.5, and 5.0 % (w/w)]. Soil-fluoride fractions and fluoride accumulated in tea plants were determined using the sequential extraction and ion selective electrode method. Obtained results showed that both charcoal and bamboo charcoal additions significantly enhanced the concentrations of Fe/Mn oxide-bound fluoride, but significantly reduced the concentrations of water-soluble and exchangeable fluoride (p < 0.05) in soil. Charcoal and bamboo charcoal additions also significantly decreased the amounts of fluoride in tea roots and tea leaves (p < 0.05). However, the additions of charcoal and bamboo charcoal had no impacts on the tea quality, as indexed by the concentrations of polysaccharides, polyphenols, amino acids, and caffeine in tea leaves. These results suggested that application of charcoal and bamboo charcoal may provide a useful method to reduce the availability of fluoride in soil and the subsequent fluoride uptake by tea plants.