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潮土是黄河冲积平原上的主要土壤类型,其质地的水平和垂直分异是造成土壤属性特别是土壤钾素含量差异的主要因素。根据权威部门测定的土壤各个粒级以及速效性钾含量的数据,利用数理统计的方法首先进行土壤机械组成与土壤速效性钾含量的相关分析,结果发现引起土壤速效性钾含量差异的因素主要是<0. 01mm的土壤颗粒,其次是粘粒、粗粘粒和细粉粒。然后用逐步回归分析的方法建立了<0. 01mm土壤颗粒与速效性钾含量之间的数学模型。用此模型推算土壤速效性钾的含量,在相对误差不大于20%的保证下,准确率达85%。文章最后对回归方程作了解释。
Fluvo-aquic soil is the main type of soil on the alluvial plain of the Yellow River. The horizontal and vertical differentiation of texture is the main factor that causes the difference of soil properties, especially the soil potassium content. According to the data of various grain fractions and available potassium content determined by authoritative department, the relationship between soil mechanical composition and soil available K content was analyzed by mathematical statistics. The main factors causing the difference in soil available K content were <0 01mm soil particles, followed by clay, coarse clay and fine particles. Then, the mathematical model between <0.01mm soil particles and available K content was established by stepwise regression analysis. Using this model to calculate soil available K content, with a relative error of not more than 20%, the accuracy is 85%. Finally, the article explains the regression equation.