Hysteresis of Water Retention Curve of the Capillarimetric Diapason in Saline Soils

IF 1.4 4区农林科学 Q4 SOIL SCIENCE

Eurasian Soil Science Pub Date : 2024-05-13 DOI:10.1134/s1064229323603426

Qiankun Tan, Siyuan Huo, Deng Wang, Ming Wen, Mantian Xing, Mengyi Lu

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Abstract

The hysteresis effect of water retention curve (WRC) has significant implications for comprehending soil water and salt transport, especially in areas with soil salinization. This study evaluates the hysteresis of WRC in saline soils by measuring the drying and wetting WRC of silty clay loam exposed to different salinities using a tension meter. We find that WRC is influenced by the superposition coupling effect of salinity and dry density, which results in an upward shift of WRC and increases the soil water holding capacity. In addition, soil matrix suction also rises with the increasing salt concentration, leading to a gradual upward shift in WRC. The presence of salt in pore spaces weakens the “ink-bottle” effect, disjoining pressure and air entrapment effect, results in a 30.9% reduction in hysteresis of WRC with increasing salinity. Additionally, the volumetric shrinkage of low dry density silty clay loam also weakens the WRC hysteresis. Furthermore, we utilized a WRC hysteresis model that considers the “ink-bottle” effect and entrapped air, which reasonably predicts the main wetting WRC of saline silty clay loam. The root-mean-square error and mean absolute error between predicted and measured values are 0.027–0.039 and 0.036–0.060, respectively. These findings are significant to the research and guidance of salinization in expansive soil and heavy textured soil area where salinization occurs.

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盐碱土中毛细管测深二叠纪保水曲线的滞后性

摘要：保水曲线（WRC）的滞后效应对理解土壤水盐迁移具有重要意义，尤其是在土壤盐碱化地区。本研究通过使用拉力计测量暴露在不同盐度下的淤泥质粘壤土的干燥和湿润保水曲线，评估了盐渍土中保水曲线的滞后效应。我们发现，盐度和干密度的叠加耦合效应会影响 WRC，导致 WRC 上移并增加土壤持水量。此外，土壤基质吸力也会随着盐浓度的增加而上升，导致持水率逐渐上移。盐在孔隙中的存在削弱了 "墨水瓶 "效应，使压力和空气夹带效应分离，导致 WRC 的滞后随盐度增加而减少 30.9%。此外，低干密度淤泥质粘壤土的体积收缩也会减弱 WRC 滞后。此外，我们利用考虑了 "墨水瓶 "效应和夹带空气的 WRC 滞后模型，合理地预测了含盐淤泥质粘壤土的主要湿润 WRC。预测值与测量值之间的均方根误差和平均绝对误差分别为 0.027-0.039 和 0.036-0.060。这些研究结果对发生盐渍化的膨胀性土壤和重质地土壤地区的盐渍化研究和指导意义重大。

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来源期刊

Eurasian Soil Science 农林科学-土壤科学

CiteScore

2.70

自引率

35.70%

发文量

137

审稿时长

12-24 weeks

期刊介绍： Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences. Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.