恩施茶园土壤中氟的赋存特征及其生物有效性

采用连续浸提分析法,研究了恩施地区5种茶园土壤中氟的赋存形态特征.结果表明,恩施茶园土壤含氟量普遍较高,5种土壤中总氟含量所测值变幅为486.9～1 124.3 mg/kg,平均含氟量为785.4mg/kg.各土壤中氟的赋存形态按量的大小表现为残余态＞可交换态＞水溶态＞有机态＞铁、锰结合态.恩施茶树体内含氟量普遍较高,5种茶叶含氟量所测值变幅为499.94～1 095.43 mg/kg,平均含氟量为698.49mg/kg.茶树体内各部位含氟量大小表现为叶＞花蕾＞根＞茎.土壤中水溶态氟生物有效性最高,交换态氟也具有较高的生物有效性,总氟、有机态氟、铁锰结合态氟及残余态氟对茶树体内含氟量没有明显影响.

Storage Features and Bioavailability of Fluorine in Soils of Tea Garden

Storage features and bioavailability of fluorine in 5 kinds of soils in tea garden of Enshi were studied using sequential extraction method.Fluorine content in soil was commonly high.The T-F of 5 different soils varied from 486.9 to 1 124.3 mg/kg and the mean of T-F was 785.4 mg/kg.The content of different forms of fluorine decreased in the order of Res-F>Ex-F>Ws-F>Or-F>Fe/Me-F.The content of fluorine in tea plants of Enshi was also very high.Fluorine contents in 5 different tea leaves varied from 499.94 to 1 095.43 mg/kg.The average fluorine content in tea leaves was 698.49 mg/kg.Fluorine distribution order in tea plants was leaves > blossom fruits > roots > stems.Bioavailability of Ws-F and Ex-F was most obvious.Res-F,Or-F,Fe/Me-F and T-F had no significant effect on fluorine content in tea plants.