Impact of Furfural Residue Combined with Desulphurized Gypsum on Saline-Alkali Soil Water-Salt and Infiltration Characteristics

文献类型： 外文期刊

第一作者： Shen, Jingli

作者： Shen, Jingli;Wang, Xu;Fan, Liqin;Wu, Xia;Chen, Wenqian;Shen, Jingli;Wang, Xu;Fan, Liqin;Wu, Xia;Chen, Wenqian;Cai, Jinjun

作者机构：

关键词： moisture; salinity; infiltration; saline-alkali soil; Philip model

期刊名称：WATER （ 影响因子：3.0； 五年影响因子：3.3 ）

ISSN：

年卷期： 2025 年 17 卷 4 期

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收录情况： SCI

摘要： The core of saline-alkali soil improvement lies in salt leaching by water and reducing alkalinity by improved materials such as acid material or desulphurized gypsum. This study conducted simulation experiments to clarify the impact of furfural residue combined with desulfurization gypsum on saline-alkali soil water-salt and infiltration characteristics in Ningxia. Based on a consistent leaching water volume of 4500 m3/hm2 and a furfural residue application amount of 7.5 t/hm2, the experiment established three desulfurization gypsum application amounts of 15 t/hm2, 22.5 t/hm2, and 30 t/hm2, with a control group that received no improved materials. The effects of different application amounts of desulfurization gypsum on water and salt distributions, alkalinity, infiltration rate, cumulative infiltration volume, and wetting front of saline-alkali soil were elucidated, and the Philip infiltration model was employed to fit the variations in cumulative infiltration volume. The results indicated the following: (1) Compared to the control group, the application of furfural residue and desulfurization gypsum resulted in an average reduction of 36.7% in soil alkalinity. The enhanced hydraulic conductivity of saline-alkali soil promoted the infiltration of water into deeper soil layers. The desalination effect in the 0-60 cm soil layer was significant; however, excessive application of desulfurization gypsum could lead to the accumulation of salts in soil layers below 80 cm. (2) The downward movement depth of the wetting front, cumulative infiltration volume, and infiltration rate all demonstrated a power function relationship with the infiltration time, with a coefficient of determination (R2) greater than 0.97. Additionally, the infiltration rate exhibited a linear correlation with the square root of the reciprocal of infiltration time, achieving an R2 exceeding 0.99. (3) The Philip infiltration model is suitable for describing the relationship between cumulative infiltration volume and infiltration time. Therefore, the application of 7.5 t/hm2 of furfural residue and 22.5 t/hm2 of desulfurization gypsum can effectively improve the saline-alkali soils in Ningxia.

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