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在西南农业大学国家紫色土肥力与肥料效益监测基地上 ,研究多年定位施肥对紫色土钾素形态变化的影响。研究结果显示 :施钾各处理 0～ 2 0cm和 2 0～ 40cm土层土壤水溶性钾、非特殊吸附态钾、特殊吸附态钾下降不明显 ,基本能保持在试验初期 ( 1991年 )的水平上 ,不施钾处理则呈现明显下降趋势 ,这表明施钾能维持紫色土速效钾 (水溶性钾 +非特殊吸附态钾 +特殊吸附态钾 )的平衡。不论施钾与否 ,各处理 0～ 2 0cm和 2 0～ 40cm土层土壤非交换性钾、矿物钾呈下降趋势 ,其中不施钾处理土壤非交换性钾下降更明显
In Southwest Agricultural University purple soil fertility and fertilizer monitoring base to study the effects of years of fertilization on the morphological changes of purple soil potassium. The results showed that soil water-soluble potassium, non-special-adsorbed potassium and special-adsorbed potassium in 0 ~ 20 cm and 20 ~ 40 cm soil layers decreased little, and could basically keep at the initial stage of experiment (1991) (P <0.05), indicating that the application of potassium can maintain the balance of available potassium (water-soluble potassium + non-special adsorption potassium + special adsorption potassium). Regardless of potassium application or not, soil non-exchangeable potassium and mineral potassium in 0 ~ 20 cm and 20 ~ 40 cm soil layers decreased, and the non-exchangeable potassium decreased more obviously