不同茶园茶叶氟含量及土壤氟的形态分布

通过对我国中西南产茶区12个茶园土壤样品和茶叶样品的采集，探讨了不同茶园茶叶氟含量和茶园土壤氟的形态分布规律。老叶和嫩叶氟含量分别为221～1 504 mg/kg和49.0～602 mg/kg，老叶氟含量是嫩叶的2.5～8.1倍。各形态氟含量随土壤层次加深没有统一变化规律，但各层土壤不同形态氟含量均为残渣态铁锰氧化物态＞有机结合态＞水溶态＞交换态。土壤pH值、有机质含量和阳离子交换量对茶园土壤氟的形态分布有不同程度的影响。老叶和嫩叶氟含量随水溶态氟含量的增加均呈显著增加趋势，但与其他形态氟含量没有显著的相关关系。

Content of Fluoride in Tea Leaves and Distribution of Fluoride in Soils from Different Tea Gardens

The contents of fluoride in tea leaves and the distribution of fluoride in tea garden soils as well as their relationships were discussed in this paper by sampling the tea leaves and soils from the twelve tea gardens located South Center and Southwest China. The contents of fluoride in tea plants ranged from 221 mg/kg to 1504 mg/kg for old leaves and 49.0 mg/kg to 602 mg/kg for young leaves, respectively, the fluoride contents in old leaves were 2.5-8.1 times higher than that in young leaves. There were not a unified changing tendency for each form of fluoride in different soil layers, but the concentrations of different F forms for each soil layer were all in the order of residualFe-Mn oxide＞organic＞water＞exchangeable. The distribution of fluoride in tea garden soils was obviously related to the soil properties. The concentrations of fluoride in the tea leaves increased significantly with the water soluble fluoride, but other forms of fluoride were not of the same correlations with the contents of fluoride in tea leaves.