室内模拟试验研究不同温度条件下干湿交替对黄土高原区四种土壤有效钾的影响,结果表明:(1)土壤钾有效性受干湿交替过程影响较大,干湿交替次数与有效钾含量间具有y=a+blogx函数关系;(2)温度升高,增强了干湿交替的剧烈程度,提高土壤钾的固定量,显著降低了土壤钾的有效性;(3)建立了反映干湿交替次数、土壤物理性粘粒和粘粒含量比值、以及钾固定量三者之间的关系方程。 The results showed that: (1) The soil potassium availability was greatly affected by the alternate wetting and drying process. The alternation of wetting and drying rates and available potassium content (2) the temperature is increased, the degree of alternation between wet and dry is enhanced, the amount of potassium in soil is increased, and the availability of potassium in soil is significantly reduced; (3) The number of alternations, the ratio of soil physical clay and clay content, and the relationship between the three quantities of potassium.