茶叶氟含量与茶园土壤特性的相关性及其影响因素

通过对青岛地区10个典型茶园中的茶叶氟含量和土壤水溶性氟、pH、交换性酸及交换性阳离子等的测定,分析了茶叶氟含量与土壤特性的相关性,并探讨了土壤水溶性氟和交换性酸的主要影响因素。结果表明,茶园土壤水溶性氟和交换性酸含量与茶叶氟含量呈显著正相关性(P<0.05),是影响茶叶氟含量的关键因素。土壤交换性H⁺和交换性Na⁺与土壤水溶性氟含量呈显著正相关性(P<0.05),是影响土壤水溶性氟含量的主要因素。土壤交换性Al³⁺与交换性酸呈极显著正相关性(P<0.01),pH、交换性Ca²⁺、交换性盐基总量和盐基饱和度与交换性酸含量呈极显著负相关性(P<0.01),是土壤交换性酸含量的主要影响因素。研究结果可为茶园土壤改良及降低茶叶氟含量的质量安全风险提供依据。

Correlation Between the Content of Fluoride in Tea and Properties of Tea Garden Soil and Its Influencing Factors

The water-soluble fluorine, pH, exchangeable acid, exchangeable cation content of soil from typical tea gardens in Qingdao and its fluoride content in tea were determined. We studied the correlation between fluoride content in tea and the soil properties, and analyzed the main influencing factors of soil water-soluble fluorine and exchangeable acid. The results showed that the water-soluble fluorine of tea garden soil and exchangeable acid were positively correlated with tea fluoride content, which are the main factors affecting the fluorine content in tea. Soil exchangeable H⁺ and Na⁺ were positively correlated with soil water-soluble fluorine, which are the main factors affecting the soil water-soluble fluorine. Soil exchangeable acid was positively correlated with exchangeable Al³⁺, and negatively correlated with pH, exchangeable Ca²⁺, exchangeable base amount and base saturation, which are the main factors affecting the soil exchangeable acid. The results can provide the bases for tea garden soil improvement and reduce the quality and safety risk of tea fluorine.