Soil potassium fixation characteristics under different land use types of aeolian sandy soil in Northwest Liaoning Province
In order to clarify the soil potassium fixation characteristics of different land use types,a comprehensive in-vestigation involving field sampling,laboratory analysis,simulation tests,and equation fitting was conducted to study the soil potassium fixation process,influencing factors,and kinetic characteristics.The results showed that the amount of potassium fixation in aeolian sandy soil increased with increasing potassium application;however,the rate of potas-sium fixation exhibited an initial sharp decline followed by a gradual flattening.Moreover,in comparison to other land use types,mobile and semi-mobile sandy land without any control measures displayed a progressively higher increase in their potassium fixation capacity with increasing potassium application.Freundlich model was found to be superior to Langmuir model and Temkin model,and was the most suitable for the adsorption isothermal curve in the study area.The factors affecting soil potassium fixation capacity were available potassium content,non-exchangeable potassium content,cationexchange content,soil water-soluble salts concentration,and organic matter content.Therefore,the potassium should be applicated by small amount but frequently to ensure both stable levels of potassium fixation capacity and optimal plant growth.
Northwest Liaoning Provincesandy land managementpotassium fixationKineticsaeolian sandy soil
万方数据
维普
