{"title":"Patterns of Potassium Sorption by Soils in Western Transbaikalia","authors":"S. B. Sosorova","doi":"10.1134/s1875372823030125","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This article analyzes patterns of potassium sorption from an aqueous solution of KCl by three types of soils (lowland peaty, light chestnut, and alluvial soddy types) formed under conditions of Western Transbaikalia and by their treated analogs. Potassium sorption in soil is measured in laboratory conditions based on an experiment in which soils are balanced using a solution with different initial concentrations of KCl (0.5, 1.0, 3.0, and 5.0 mmol/L) for 24 h. The resulting potassium sorption isotherms are described by the Langmuir and Freundlich equations. Parameters of these equations indicate an inhomogeneity of the bonds of potassium ions with the solid phase of soils. The maximum potassium uptake by the studied soils varies from 53.2 to 87.8% at the initial KCl concentration of 1 mmol/L, while the coefficient of distribution (<i>K</i><sub>d</sub>) of potassium between the solid and liquid phases of the soils used in the study varies from 11.37 to 72.11 L/kg. The highest <i>K</i><sub>d</sub> value has been determined for the lowland peaty soil and the lowest value for the alluvial soddy soil. The patterns of changes in <i>K</i><sub>d</sub> of potassium are correlated with the degree of its absorption by the soil. The maximum sorption capacity of potassium by the soils varies from 54.05 to 98.04 mmol/kg in the upper humus horizons and from 35.71 to 100.0 mmol/kg in the lower horizons. The values of the <i>K</i><sub>L</sub> coefficient of the Langmuir equation are slightly lower in humus horizons (0.272‒0.668 L/mmol) than in mineral horizons (0.102–1.511 L/mmol), which indicates that potassium binds more strongly in mineral horizons. The <i>K</i><sub>F</sub> coefficient of the Freundlich equation varies from 9.98 to 23.51 mmol/kg in humus horizons and from 6.63 to 26.77 mmol/kg in mineral horizons. It has been established that the studied soils are characterized by different sorption activities with respect to potassium and form the following decreasing series with respect to the level of potassium absorption: lowland peaty > light chestnut > alluvial soddy soils.</p>","PeriodicalId":44739,"journal":{"name":"Geography and Natural Resources","volume":null,"pages":null},"PeriodicalIF":0.3000,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geography and Natural Resources","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1134/s1875372823030125","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOGRAPHY","Score":null,"Total":0}
引用次数: 0
Abstract
This article analyzes patterns of potassium sorption from an aqueous solution of KCl by three types of soils (lowland peaty, light chestnut, and alluvial soddy types) formed under conditions of Western Transbaikalia and by their treated analogs. Potassium sorption in soil is measured in laboratory conditions based on an experiment in which soils are balanced using a solution with different initial concentrations of KCl (0.5, 1.0, 3.0, and 5.0 mmol/L) for 24 h. The resulting potassium sorption isotherms are described by the Langmuir and Freundlich equations. Parameters of these equations indicate an inhomogeneity of the bonds of potassium ions with the solid phase of soils. The maximum potassium uptake by the studied soils varies from 53.2 to 87.8% at the initial KCl concentration of 1 mmol/L, while the coefficient of distribution (Kd) of potassium between the solid and liquid phases of the soils used in the study varies from 11.37 to 72.11 L/kg. The highest Kd value has been determined for the lowland peaty soil and the lowest value for the alluvial soddy soil. The patterns of changes in Kd of potassium are correlated with the degree of its absorption by the soil. The maximum sorption capacity of potassium by the soils varies from 54.05 to 98.04 mmol/kg in the upper humus horizons and from 35.71 to 100.0 mmol/kg in the lower horizons. The values of the KL coefficient of the Langmuir equation are slightly lower in humus horizons (0.272‒0.668 L/mmol) than in mineral horizons (0.102–1.511 L/mmol), which indicates that potassium binds more strongly in mineral horizons. The KF coefficient of the Freundlich equation varies from 9.98 to 23.51 mmol/kg in humus horizons and from 6.63 to 26.77 mmol/kg in mineral horizons. It has been established that the studied soils are characterized by different sorption activities with respect to potassium and form the following decreasing series with respect to the level of potassium absorption: lowland peaty > light chestnut > alluvial soddy soils.
期刊介绍：
Geography and Natural Resources publishes information on research results in the field of geographical studies of nature, the economy, and the population. It provides ample coverage of the geographical aspects related to solving major economic problems, with special emphasis on regional nature management and environmental protection, geographical forecasting, integral regional research developments, modelling of natural processes, and on the advancement of mapping techniques. The journal publishes contributions on monitoring studies, geographical research abroad, as well as discussions on the theory of science.
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