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黄土地区土壤类型和发育程度与土壤非代换性钾有关。本文初步研究了黄土地区主要土壤类型非代换性钾的变化。影响土壤非代换性钾含量和释放累积量的主要因素是土壤质地和有机质。粉砂粒、粘粒和有机质与非代换性钾呈正相关,而砂粒与非代换性钾呈负相关。土壤非代换性钾含量由北向南从66.71—84.62增到117.09—129.95mg/100g土;释放累积量由北向南从147.03—173.00增到251.18—346.08mg/100g土。说明黄土地区土壤非代换性钾的含量和释放累积量均从北向南逐渐增加。砂绵土和黄绵土,砂黑垆土和轻黑垆土的非代换性钾含量和释放累积量其剖面分布较均一;而粘黑垆土和黑(土娄)土的粘化层的非代换性钾含量和释放累积量高于耕作层和母质层,但因地形部位不同又存有一定差异。
Soil types and development degree in loess area are related to soil non-substituted potassium. In this paper, the changes of non-substituted potassium in main soil types in loess area were preliminary studied. The main factors affecting soil non-substituted potassium content and release of cumulated amount of soil texture and organic matter. There was a positive correlation between silt, clay, organic matter and non-substituted potassium, but negative correlation between sand and non-substituted potassium. Soil non-substituted potassium content increased from 66.71-84.62 from north to south to 117.09-129.95mg / 100g soil; the cumulated amount of release increased from 147.03-173.00 to 251.18-346.08mg / 100g soil from north to south. The results showed that the content of soil non-substituted potassium and the cumulative release of soil increased gradually from north to south in loess area. Sandy soil and loamy soil, sandy loam soil and light black loam soil non-substituted potassium content and release cumulative amount of its cross-section distribution is more uniform; and sticky black loam soil and black (earth) soil sticky layer of non- Substitution potassium content and release cumulant were higher than the tillage and parent material layer, but there are some differences due to different topographical positions.