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用Ｑ／Ｉ方法对砖红壤、红壤、壏土、黑土和水稻土供钾特性进行了研究，结果表明，５ 种土壤对钾的缓冲性能（ＰＢＣＫ） 大小顺序为黑土＞ 壏土＞ 水稻土＞ 红壤＞ 砖红壤，５ 种土壤ＰＢＣＫ 和ＣＥＣ之间密切相关，可以用回归方程ｙ＝ －８ ．３２ ＋ ５．９２ｘ 表示，相关系数（ｒ） 为０．９８４ 。黑土和壏土以云母和蛭石２∶１ 型粘粒矿物为主，较多的楔形区域导致了较高钾特殊吸附（Ｋｘ） 值；而红壤和砖红壤具有较低Ｋｘ 归于粘粒矿物以高岭石为主。土壤的供钾强度指标（ＡＲＫｅ０） 大小顺序为砖红壤＞ 红壤＞ 壏土＞ 水稻土＞ 黑土，该值不仅取决于该土壤交换性钾含量，同时由粘粒矿物决定。
The Q / I method was used to study the characteristics of potassium supply in latosol, red soil, clayey soil, black soil and paddy soil. The results showed that the order of PBCK of the five soils was black soil> loamy soil> paddy soil> Red soil> brick red soil, five kinds of soil PBCK and CEC are closely related, you can use the regression equation y = -8. 32 + 5.92x, the correlation coefficient (r) is 0.984. Black and clay soil is dominated by mica and vermiculite 2: 1 type clay minerals, with more wedges leading to higher potassium specific adsorption (Kx) values; whereas red and red brick have lower Kx due to clay minerals Kaolinite-based. Soil potassium supply intensity index (ARKe0) in the order of brick red soil> red soil> clay soil> paddy soil> black soil, the value not only depends on the soil exchangeable potassium content, but also determined by the clay minerals.