杭嘉湖地区水稻土中氟的分布特征

测定分析了杭嘉湖地区400余份水稻土土样中氟（全氟、交换态氟和水溶态氟）的含量，对该地区水稻土中氟的土壤环境质量评价基准值进行了初步研究。结果表明，水稻土中的全氟与可交换态氟含量均呈正态分布。水溶态氟的含量符合对数正态分布。在5种不同母质发育的水稻土中，河相沉积物发育的水稻土全氟含量最高，算术平均值为333．1mgkg^-1；海相沉积物发育的水稻土次之，为324．3mgkg^-1；黄壤和红壤性坡残积物最低，为245．4mgkg^-1。海相沉积物发育的水稻土水溶态氟和可交换态氟含量最高，分别为1．55mgkg^-1和4．03mgkg^-1。不同类型的水稻土（渗育性水稻土、潴育性水稻土、潜育性水稻土和淹育性水稻土）剖面中耕作层的全氟含量均高于亚耕层，而剖面中水溶性氟的分布规律则相反。初步确定杭嘉湖地区水稻土中氟的环境质量评价基准建议值全氟为413．9mgkg^-1，水溶态氟为2．54mgkg^-1。

DISTRIBUTION CHARACTERISTICS OF FLUORINE IN PADDY SOILS OF THE HANG-JIA-HU PLAIN

Fluorite contents(including total fluorite,exchangeable fluorite,and water-soluble fluorite) in 400 paddy soil samples collected from the Hang-JiaHu Plain,Zhejiang Province,China,were determined and the guideline for evaluation of(F-related) environmental quality of the paddy soils in the region was studied.Results indicate that both the contents of total fluorite and exchangeable fluorite followed the normal distribution,and that of water soluble fluorite fit the logarithm normal distribution.The average content of total fluorite in the paddy soils developed from fluviatile deposit and marine deposit was 333.1 mg kg~(-1) and 324.3 mg kg~(-1),respectively.The content of water-soluble fluorite and exchangeable fluorite in the paddy soils developed from marine deposit was 1.55 mg kg~(-1) and 4.03 mg kg~(-1),respectively.The content of total fluorite in the cultivated layer was higher than that in sub-cultivatedlayer,regardless of soil types(Percogenic paddy soil,Hydrogric paddy soil,Gleyed paddy soil,and Submergic paddy soil),whereas it was the other way round with water-soluble fluorite.It is tentatively recommended that the guideline for evaluation of F-related environmental quality of the paddy soils in the Hang-JiaHu Plain is 413.9 mg kg~(-1) for total fluorite and 2.54 mg kg~(-1) for water soluble fluorite.