ABSTRACT

Tea polyphenols (TPs) may reach the soil through root secretions and the decomposition of fallen leaves in the tea garden ecosystem and may activate elements existing in the soil through complexation. We designed different epigallocatechin gallate (EGCG) concentration, residence time, and extraction reagent to determine the effect of these treatments on the mobilization of potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), and manganese (Mn). The results showed that the EGCG concentration had a significant impact on the mobilization of these five elements. According to the correlation coefficient of desorptive kinetic equations, K, Ca, Mg, Fe, and Mn desorption onto soil was well described by first-order kinetic equation model (R² > 0.98, P < .01). The effect of LMWOAs (low molecular weight organic acids) was greater than that of EGCG on mobilizing amounts of large elements including K, Ca, and Mg. Our study provides a more detailed understanding of the interactions between EGCG and minerals, which may offer prospects for improving plant nutrient acquisition through direct modifications of rhizosphere management.

摘要

茶多酚（TPs）可以通过茶园生态系统中的根系分泌物和落叶的分解到达土壤，并通过络合激活土壤中存在的元素。我们设计了不同的表没食子儿茶素没食子酸酯 (EGCG) 浓度、停留时间和提取试剂，以确定这些处理对钾 (K)、钙 (Ca)、镁 (Mg)、铁 (Fe) 和锰动员的影响。锰）。结果表明EGCG浓度对这五种元素的动员有显着影响。根据解吸动力学方程的相关系数，K、Ca、Mg、Fe、Mn 解吸到土壤中的过程可以用一阶动力学方程模型很好地描述（R ²  > 0.98，P< .01)。LMWOA（低分子量有机酸）对包括 K、Ca 和 Mg 在内的大元素的动员量的影响大于 EGCG。我们的研究提供了对 EGCG 与矿物质之间相互作用的更详细的理解，这可能为通过直接修改根际管理来改善植物养分获取提供前景。