采用室内培养和温室盆栽连续耗竭试验的方法，对河北省褐、潮土区土壤钾素形态，含量水平及供钾能力进行了研究。结果表明，褐、潮土区有效钾含量平均在中等偏上水平，区域间元明显差异，而缓效钾含量冀东土壤明显低于冀中南土壤。在耗竭种植条件下，土壤速效钾随着消耗出现“最低水平值”，植株吸钾来源部分来自速效钾，较大比例来自缓效钾。土壤速效钾可作为当季有效钾水平的衡量指标，缓效钾的实际贮量及释放能力是土壤供钾能力的一个重要标志。 The method of indoor incubation and continuous greenhouse pot depletion test was used to study the form and content of soil potassium and the potassium supply capacity of brown and tide soil in Hebei Province. The results showed that available potassium content in brown soil and shady soil was averagely above middle level, with obvious difference between the two areas. However, the content of slow-acting potassium in Jidong soil was significantly lower than that in Jizhongnan soil. Under depleted planting conditions, the “lowest level” of soil available K with consumption appears to be due to a portion of the source of available potassium from the available potassium, the greater of which is from the slow-acting potassium. Soil available potassium can be used as a measure of the available potassium level in the season. The actual storage and release capacity of slow-acting potassium is an important indicator of soil potassium availability.