| Effects of synergism of brackish water and biochar on infiltration characteristics and water\|salt migration in saline\|alkali soil |
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| DOI：10.7606/j.issn.1000-7601.2023.02.18 |
| Key Words: saline\|alkali soil brackish water biochar soil water and salt transport water infiltration model |
| Author Name | Affiliation | | WU Wei | College of Agricultural Engineering and Food Science，Shandong University of Technology, Zibo,Shandong 255000, China | | GAO Peiling | College of Agricultural Engineering and Food Science，Shandong University of Technology, Zibo,Shandong 255000, China
School of Resources and Environmental Engineering，Shandong University of Technology,Zibo,Shandong 255000, China | | GUO Xianglin | College of Agricultural Engineering and Food Science，Shandong University of Technology, Zibo,Shandong 255000, China | | LV Qingxin | College of Agricultural Engineering and Food Science，Shandong University of Technology, Zibo,Shandong 255000, China | | ZHANG Xue | College of Agricultural Engineering and Food Science，Shandong University of Technology, Zibo,Shandong 255000, China | | LI Mengzhao | College of Agricultural Engineering and Food Science，Shandong University of Technology, Zibo,Shandong 255000, China | | WANG Shibin | College of Agricultural Engineering and Food Science，Shandong University of Technology, Zibo,Shandong 255000, China |
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| Abstract: |
| This study used the one\|dimensional vertical soil column infiltration experiment to investigate the water\|salt transport characteristics of saline soils with brackish water irrigation and biochar application and their effects on the parameters of Philip and one\|dimensional algebraic models, and the applicability of infiltration model was evaluated. The treatments of freshwater control (0 g·L-1) and four brackish water mineralization levels (2, 3, 4, 5 g·L-1) combining with the application of corn stover biochar (5 t·hm-2) were set up. The results showed that the use of brackish water irrigation or biochar application increased soil water infiltration rate and soil water content, and improved soil water retention capacity. The effect was better under the synergistic effect of brackish water and biochar. Irrigation with brackish water and application of biochar reduced the soil salinity, and the average salinity within 0~30 cm depth was reduced by 34.75%~74.00% compared with the initial salinity, with good salt leaching effect. The Philip infiltration model simulated better the soil water infiltration under the synergistic effect of brackish water and biochar, with irrigation of brackish water or biochar application increasing the infiltration rate S, and the increase in S was greater when the two are combined. The mean absolute error and root mean square error between the theoretical and measured moisture content values of the soil layers calculated by the algebraic model were less than 2.2%, demonstrating the good applicability of the one\|dimensional algebraic model. In conclusion, the use of brackish water irrigation with biochar application was a better solution for improving moderately saline soils in the Yellow River Delta region. |
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