土壤阳离子交换量(CEC)是反映土壤肥力水平的重要指标之一,它能够较好地说明土壤的供肥容量以及保肥能力。笔者对湖南省主要茶园土壤阳离子交换量和部分相关因素进行了初步探讨,为评价该省茶园土壤肥力提供一些背景材料。试验采集了湖南省主要茶场68个茶园土样,采样深度,点样为0～30cm,剖面样为剖面层次中的表土层。测定项目,阳离子交换量采用EDTA-铵盐快速法,有机质含量用重铬酸钾容量法,反映土壤酸度的代换性铝、氢用氯化钾交换中和滴定法与pH_水电位 Soil Cation Exchange (CEC) is one of the important indicators of soil fertility level, which can better explain the soil available fertilizer capacity and fertility. The authors first discussed the cation exchange capacity and some related factors of the main tea plantations in Hunan Province, and provided some background materials for evaluating the tea plantation soil fertility in Hunan Province. A total of 68 tea plantations in Hunan Province were sampled. The depth of sampling was 0-30 cm, and the profile was the topsoil in the section. Determination of the project, the cation exchange rate using EDTA-ammonium fast method, the organic content with potassium dichromate capacity method, reflecting the soil acidity alternative aluminum, hydrogen and potassium chloride exchange neutralization titration and pH_potential