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 (K_d) 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 K_d value has been determined for the lowland peaty soil and the lowest value for the alluvial soddy soil. The patterns of changes in K_d 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 K_L 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 K_F 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.

中文翻译：

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西外贝加尔地区土壤钾吸附模式

摘要

本文分析了西外贝加尔地区条件下形成的三种土壤（低地泥炭土、浅栗子土和冲积土）对 KCl 水溶液的钾吸附模式及其处理过的类似土壤。土壤中钾的吸附量是在实验室条件下根据实验测量的，其中使用具有不同初始浓度 KCl（0.5、1.0、3.0 和 5.0 mmol/L）的溶液平衡土壤 24 小时。由此产生的钾吸附等温线由 Langmuir 和 Freundlich 方程描述。这些方程的参数表明钾离子与土壤固相的键不均匀。当初始 KCl 浓度为 1 mmol/L 时，所研究的土壤的最大钾吸收率为 53.2% 至 87.8%，而研究中使用的土壤固相和液相之间钾的分配系数 ( Kd ₎也不同11.37 至 72.11 升/公斤。低地泥炭土的K _d值最高，冲积草质土的 K d 值最低。钾的Kd变化模式与其_被土壤吸收的程度相关。土壤对钾的最大吸附能力在上部腐殖质层中为 54.05 至 98.04 mmol/kg，在下部层中为 35.71 至 100.0 mmol/kg。_{Langmuir方程的}KL系数在腐殖质层中的值(0.272−0.668 L/mmol) 略低于矿物层中的 (0.102–1.511 L/mmol)，这表明钾在矿物层中的结合更强。Freundlich 方程的K _F系数 在腐殖质层中从 9.98 到 23.51 mmol/kg 变化，在矿物层中从 6.63 到 26.77 mmol/kg 变化。已经确定，所研究的土壤具有不同的钾吸附活性，并形成以下关于钾吸收水平的递减序列：低地泥炭土>浅栗色土>冲积草质土。