New insights into the solute transport processes of red soil combining CT scanning and stable isotope tracing
文献类型： 外文期刊
作者： Ju, Xinni 1 ; Gao, Lei 4 ; She, Dongli 1 ; Jia, Yuhua 6 ; Biswas, Asim 7 ; Peng, Xinhua 5 ;
作者机构： 1.Hohai Univ, Coll Agr Sci & Engn, Nanjing 210098, Peoples R China
2.Chinese Acad Sci, Res Ctr Soil & Water Conservat & Ecol Environm, Yangling 712100, Shaanxi, Peoples R China
3.Minist Educ, Yangling 712100, Shaanxi, Peoples R China
4.Chinese Acad Sci, Inst Soil Sci, Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
5.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arable Land China, Beijing 100081, Peoples R China
6.Shenyang Agr Univ, Coll Water Conservancy, Key Lab Soil Eros Control & Ecol Restorat Liaoning, Shenyang 110866, Peoples R China
7.Univ Guelph, Sch Environm Sci, 50 Stone Rd East, Guelph, ON N1G 2W1, Canada
关键词： Red soil; Soil pore structure; Solute transport; Breakthrough curves; Land uses
期刊名称：JOURNAL OF HYDROLOGY （ 影响因子：6.3； 五年影响因子：6.9 ）
ISSN： 0022-1694
年卷期： 2025 年 659 卷
页码：
收录情况： SCI
摘要： Understanding soil pore structure's influence on material transport is crucial for nutrient cycling and pollutant management, particularly in complex hydrological environments. This study investigated the relationship between soil structure and solute transport across three land uses (forest, citrus, and rainfed cropland) in China's red soil region using X-ray computed tomography and water tracers. Forest soils exhibited well-connected macropores, while rainfed cropland showed numerous discrete micropores. Citrus land displayed heterogeneous pore distribution with high surface macroporosity but low overall macropore content. Breakthrough curves revealed three distinct transport stages: initial transport, rapid replacement, and complete stages, each demonstrating unique characteristics based on land use. The initial transport varied significantly among land uses (0.2 pore volumes for forest/citrus, 0.1 for cropland), with cropland showing nearly double the porosity (24.4 %) compared to other land uses at this stage. Complete stage convergence occurred at approximately 1.6 pore volumes across all land uses. The Continuous Time Random Walk model outperformed the AdvectionDispersion Equation in predicting solute transport (R2 = 0.999), particularly in capturing late-time tailing phenomena. Bulk density, mean diameter, soil organic matter, and pore connectivity explained 51.6 % and 61.5 % of the variability in transport parameters Phi A and Phi B, respectively. These findings enhance our understanding of structure-transport relationships in red soil regions and provide valuable insights for sustainable land management practices, pollutant transport prediction, and the development of targeted soil remediation strategies in similar hydrological conditions worldwide.
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