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Effect of Soil Samples Preparation on Their Thermal Hydrophysical Properties and Allelotoxicity
Eurasian Soil Science ( IF 1.4 ) Pub Date : 2022-04-11 , DOI: 10.1134/s1064229322030115
D. I. Potapov , A. P. Shvarov , I. V. Gorepekin , O. A. Salimgareeva , G. N. Fedotov

Abstract

Changes in the properties of soil samples during drying or heating are known. However, the reasons for them have remained unclear up to this time. Our study aims to clarify the processes occurring during drying–wetting and heating of wet soils by the study of the changes in the soil properties. Soddy-podzolic soils were investigated. The influence of soil drying on the water-holding capacity in the capillary and hygroscopic water ranges of the water retention curve (WRC), hydraulic conductivity, water stability of soil aggregates, and allelotoxicity has been studied. The impact of heating of wet soils on the hydrophilic-hydrophobic properties, allelotoxicity, electrical conductivity of soil water extracts, and thermal diffusivity of wet soils has also been analyzed. It is shown that soil particles become hydrophobized during drying–wetting cycles and during autoclaving, which leads to an increase in the content of allelotoxins accessible to plants. To explain the obtained data, the concept of transformation of gel structures covering and binding soil particles during drying or heating has been used. The applied model includes an assumption that primary particles of humus substances having a diphilic surface and forming fractal clusters can interact with one another in the primary and secondary minima of aggregation.



中文翻译:

土壤样品制备对其热水物理性质和化感毒性的影响

摘要

在干燥或加热过程中土壤样品性质的变化是已知的。然而,到目前为止,它们的原因仍不清楚。我们的研究旨在通过研究土壤性质的变化来阐明湿土壤干湿和加热过程中发生的过程。对苏打灰泥土进行了调查。研究了土壤干燥对保水曲线(WRC)的毛细水分和吸湿水分范围内的持水能力、水力传导率、土壤团聚体的水稳定性和化感毒性的影响。还分析了加热湿土壤对亲水-疏水特性、化感毒性、土壤水提取物的导电性和湿土壤的热扩散率的影响。结果表明,在干湿循环和高压灭菌过程中,土壤颗粒变得疏水化,这导致植物可接触到的化感毒素含量增加。为了解释获得的数据,使用了在干燥或加热过程中覆盖和结合土壤颗粒的凝胶结构转变的概念。所应用的模型包括一个假设,即具有双亲表面并形成分形簇的腐殖质物质的初级颗粒可以在初级和次级最小聚集中相互相互作用。

更新日期:2022-04-11
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