摘要： 内蒙、山西地区土壤钾素的分布状况是：（1）内蒙古鄂尔多斯台地各种类型土壤的速效钾和缓效钾的含量低于河套地区各种类型的土壤；（2）山西省西山黄土丘陵区、中部各盆地土壤的速效钾和缓效钾由北向南逐渐增加。从大范围各种类型土壤的速效钾和缓效钾与砂粒呈负相关：就某种土壤而言与有机质呈正相关。山西省各种土壤的速效钾在土壤剖面分布符合幂回归，而缓效钾在剖面呈低谷或凸形分布。

关键词: 土壤速效钾, 土壤缓效钾

Abstract: The quick-acting potassium and the slow-acting potassium of major soil types of the Inner Mongolia and Shanxi in loess plateau is studied in the present paper.The results obtained are summarized as follows:The distribution of soil potassium on the Inner Mongolia and Shanxi province in loess plateau is:l.The content of quick-acting and slow-acting potassium of different soil type in Obrdos platform is lower than that in different soil type of Hetao area.2,The content of quick-acting and low-acting potassium gradually increases from north to south on loess hills and basin of middle part in Shanxi province.The quick-acting and slow-actng potassium content is negatively correlated with sand on large scale,but positively with organic matter on a soil type.The quick-acting potassium content accords with power equation(Y=ax-b)in different soil types in Shanxi province,and the model of distribution of slow-acting potassium content is low valley or bow form on soil profile.

Key words: Soil potassium, Quick-acting potassium, Slow-acting pota-ssimm