Numerical Evaluation of the Effects of Increasing Ratio of Cropped to Uncropped Width on Dry Drainage Efficiency in Salty Soils
Numerical Evaluation of the Effects of Increasing Ratio of Cropped to Uncropped Width on Dry Drainage Efficiency in Salty Soils
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DOI：
10.1002/ird.2199
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发表时间：
2018-08
影响因子：
1.9
通讯作者：
M. Soltani;A. Rahimikhoob;A. Sotoodehnia;G. Mendicino;M. Akram;A. Senatore
中科院分区：
文献类型：
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作者：
M. Soltani;A. Rahimikhoob;A. Sotoodehnia;G. Mendicino;M. Akram;A. Senatore
如果根区土壤盐分得到控制，可持续农业可以促进干旱和半干旱地区的粮食安全。最近，专家们一直在集中精力研究替代和环保的解决方案。在本研究中，通过现场实验和基于HYDRUS - 2D建模环境的数值方法，评估了干排水作为一种可持续且具有成本效益的替代技术。结果表明：种植区土壤盐分从表层到底层呈递增趋势，土壤盐分运动（运输方向）由种植区向未种植区；增加种植宽度与未种植宽度之比，导致种植根区土壤盐分增加，盐分浓度不稳定。模拟结果表明，尽管HYDRUS‐2D模拟的土壤含水量优于土壤盐度，但观测数据和模拟数据之间没有显著差异。模拟土壤含水量（SE = 0.08, NRMSE = 0.133）的性能指标平均值优于模拟土壤盐度（SE = 0.28, NRMSE = 0.262）。在播种宽度与未播种宽度相同（1（已播种）：1（未播种））的情况下，试验区土壤表面盐度增加2.7倍（从2.1到5.7 dS m−1），增加播种宽度（2（已播种）：1（未播种）），土壤表面盐度增加7.5倍（从2.3到17.3 dS m−1）。版权所有©2017 John Wiley & Sons， Ltd
Sustainable agriculture can contribute to food security in arid and semi‐arid regions if soil salinity in the root zone is kept under control. Recently, experts have been concentrating their research towrds alternative and environmentally friendly solutions. In this study, dry drainage was evaluated as a sustainable and cost‐effective alternative technique, by means of both field experiments and a numeric approach based on the HYDRUS‐2D modelling environment. Results showed that soil salinity in the cropped area increased from the soil surface to the bottom, and soil salinity movement (transport direction) was from the cropped to uncropped area. Increasing the ratio of cropped to uncropped width led to an increase in soil salinity of the cropped root zone and lack of stabilization of salinity concentration. Results of modelling showed that there are no significant differences between observed and modelled data, even though HYDRUS‐2D simulated soil water content better than soil salinity. Averages of performance indices for simulated soil water content (SE = 0.08, NRMSE = 0.133) were better in comparison with simulated soil salinity (SE = 0.28, NRMSE = 0.262). Soil surface salinity in the cropped area increased 2.7 times (from 2.1 to 5.7 dS m−1) during the experiment for equal cropped to uncropped width (1 (cropped): 1 (uncropped)), and by increasing cropped width (2 (cropped): 1 (uncropped)) it increased 7.5 times (from 2.3 to 17.3 dS m−1). Copyright © 2017 John Wiley & Sons, Ltd.