Addition of Fine Sand in the Low‐Permeability Dryland Saline‐Sodic Soil Increases the Permeability and Soil Moisture Conservation

IF 3.7 2区农林科学 Q2 ENVIRONMENTAL SCIENCES

Land Degradation & Development Pub Date : 2025-08-19 DOI:10.1002/ldr.70148

Yingge Xie, Weifeng Liu, Yulei Ma, Yuanjun Zhu, Jiangbo Qiao, Xiaoyang Han, Gao‐Lin Wu

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引用次数: 0

Abstract

Soil salinization poses a significant challenge to farmland tillage and production worldwide, especially in the dryland saline‐sodic soils area characterized by clayey texture, low permeability, and high compaction. How to solve soil water infiltration of the low‐permeability saline‐sodic soils is an important practical problem that has been restricting its agricultural production availability. In this study, fine sand with particle sizes of 0.15–0.50 mm was used for two treatments: covering soil with a 0.5 cm thick layer and mixing at a 1:2 ratio (fine sand: saline‐sodic soil) to evaluate sand addition effects on soil physical and hydraulic properties. Results showed that the addition of fine sand to the low‐permeability soil significantly improved the soil physical properties. Mixing fine sand into low‐permeability soil reduced bulk density (BD) and soil compressive strength (SCS) of surface soil by 2.8% and 41.5%, while increasing total porosity (TP), non‐capillary porosity (NCP) and soil water content (SWC) by 3.0%, 11.3%, and 26.6%, respectively. Additionally, fine sand covering onto the low‐permeability dryland soils led to a significant decrease in SCS, TP, and NCP by 30.1%, 4.6%, and 20.3%, respectively, while SWC increased by 81%. Soil infiltration rate was increased due to mixing fine sand into the soil. The initial infiltration rate (IIR) and steady‐state infiltration rate (SIR) significantly increased by 65.1% and 44.5% after mixing fine sand into the soil, respectively. BD and NCP were the dominant influence factors on SIR, and SCS and NCP were identified as the main influence factors on IIR when employing fine sand covering and mixing for the low‐permeability soils. Therefore, this study's findings highlighted the effectiveness of the addition of fine sand in improving soil permeability and soil water conservation and provided a tested practical basis for the addition of fine sand to enhance the sustainability of the saline‐sodic soils.

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在低渗透旱地盐碱土中添加细砂提高了土壤的渗透性和保水性

土壤盐碱化对世界范围内的农田耕作和生产构成了重大挑战，特别是在具有粘土质地、低渗透性和高压实性的旱地盐碱土地区。低渗透盐碱土的土壤入渗问题一直是制约其农业生产有效性的重要现实问题。本研究以粒径为0.15 ~ 0.50 mm的细砂为研究对象，采用0.5 cm厚的细砂覆盖土壤，并按1:2的比例（细砂与盐碱土）混合，评价加砂对土壤物理和水力特性的影响。结果表明，在低渗透土壤中添加细砂可显著改善土壤的物理性质。在低渗透土壤中掺入细砂，表层土壤容重（BD）和抗压强度（SCS）分别降低2.8%和41.5%，总孔隙度（TP）、非毛管孔隙度（NCP）和土壤含水量（SWC）分别增加3.0%、11.3%和26.6%。此外，低渗透旱地土壤覆盖细沙导致SCS、TP和NCP分别减少30.1%、4.6%和20.3%，而SWC增加81%。在土壤中掺入细砂可提高土壤入渗速率。土壤中掺入细砂后，初始入渗率（IIR）和稳态入渗率（SIR）分别显著提高65.1%和44.5%。低渗透土采用细砂覆盖拌合时，BD和NCP是影响SIR的主要因素，而SCS和NCP是影响IIR的主要因素。因此，本研究结果突出了细砂添加对提高土壤渗透性和水土保持的有效性，并为添加细砂提高盐碱化土壤的可持续性提供了试验实践依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Land Degradation & Development 农林科学-环境科学

CiteScore

7.70

自引率

8.50%

发文量

379

审稿时长

5.5 months

期刊介绍： Land Degradation & Development is an international journal which seeks to promote rational study of the recognition, monitoring, control and rehabilitation of degradation in terrestrial environments. The journal focuses on: - what land degradation is; - what causes land degradation; - the impacts of land degradation - the scale of land degradation; - the history, current status or future trends of land degradation; - avoidance, mitigation and control of land degradation; - remedial actions to rehabilitate or restore degraded land; - sustainable land management.