徐州地氟病区植物中氟的分布及其环境意义

徐州地氟病区几种主要粮食中氟的含量变化在0．70－0．85mg/kg之间，均不超过国家卫生标准值。各种主食蔬菜中氟的含量变化在1．88－12．25mg/kg之间，远超过国家卫生标准，其中以青菜氟含量较高（12．25mg/kg），同种蔬菜叶中氟含量高于块茎和果实的氟含量。不同树中氟含量高达24．56－34．29mg/kg。相关分析表明，植物中的氟含量主要取决于土壤中水溶性氟的含量。叶菜（青菜、白菜等）和树叶中氟含量远远超过土壤中水溶性氟的含量（病区土壤中水溶性氟含量平均值9.60mg/kg），说明氟有随水向植物叶子中富集的趋势。徐州地氟病区主食粮食对人体健康不构成伤害，主食蔬菜氟含量高，长期食用是引发地氟病的重要因素之一。

Fluorine Distribution in Plants of Xuzhou Epidemic Fluorosis Area and Its Environmental Significance

Fluorine contents in grains of Xuzhou epidemic fluorosis area range between 0.70 and 0.85 mg/kg, and don't exceed the national hygienic standard values. Fluorine contents in various main vegetables are from 1.88 to 12.25 mg/kg, among which green vegetable has the highest fluorine content of 12.25 mg/kg. They are much higher than the national hygienic standard values. Fluorine in vegetable leaves is higher than that in tubers and seeds of the same vegetables. 　　Fluorine contents in different tree leaves are up to 24.56～34.29 mg/kg. The correlation analysis demonstrates that fluorine in plants mainly comes from water-soluble fluorine in soil. Leaf vegetables (green vegetable and cabbage) and tree leaves have much higher water-soluble fluorine content than that in soil. It shows that fluorine has a trend to be accumulated in leaves and is transported in aqueous solution. 　　The main food, grains, is not harmful to human health in Xuzhou epidemic fluorosis area. High fluorine content in main vegetables is one of the key factors to cause epidemic fluorosis.