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| Effects of non-adsorptive ions′ changing concentrations on infiltration characteristics of red soil |
| LIU Weijia1,2, LI Zhanbing1*, ZOU Dasheng2, PEI Qingbao1,3 |
| 1.Faculty of Water Resources and Hydroelectric Engineering, Xi′an University of Technology, Xi′an, Shaanxi 710048, China; 2.Jiangxi Province Water Resources Planning and Design Institute, Nanchang, Jiangxi 330020, China; 3. Jiangxi Province Water Resources Planning and Design Institute, Nanchang Institute of Technology, Nanchang, Jiangxi 330099, China |
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Abstract To study the effect of non-adsorption ions′ concerntrations changing on the migration characteristics and distribution of moisture solute in red soil, we simulated it by HYDRUS model and one-dimensional vertical infiltration. The result shows that the initial concentration of Cl- has a strong influence on the advancing and infiltration capacity. The higher the initial concentration was, the faster the wetting front advance, and the accumulated infiltration and the stable infiltration rate increase correspondingly. However, it is not obvious during the initial 100 min. Besides, the initial concentration of Cl-also effects soil moisture content and the Cl- content in soil, and they become higher with the initial concentration increasing at the same depth in soil. Because the average relative error is small and NSE is above 0.85,HYDRUS model is within 9.3%, the model′s applicability is satisfactory. The research results can provide guidance for the study of the moisture solute migration in water-fertilizer irrigation of red soil.
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Received: 24 April 2018
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