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| Effects of different modifiers on water-salt transport characteristics in coastal saline-alkaline soils |
| XIANG Longkang1, GAO Peiling1,2*, ZHANG Qingwen3, ZHAO Yadong1, WANG Shibin1, YANG Daming1 |
| 1. School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255000, China; 2. School of Resources and Environmental Engineering, Shandong University of Technology, Zibo, Shandong 255000, China; 3. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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Abstract In order to explore the effects of surface layer(0-20 cm)mixed with different modifiers on salinized soil improvement, taking the moderate saline-alkaline soil in the Yellow River Delta as the research object, and one-dimensional vertical water infiltration experiments were conducted. Two modifiers were added to the surface layer, namely river sand and biochar and seven treatments, including CK, S1, S2, S3, C1, C2 and C3 were set up to study their improvement effects. Under different river sand and biochar dosages, two modifiers can improve soil water infiltration performance. Among them, the modifier biochar can significantly increase the water content in the mixing layer, and the modifier river sand can considerably raise the soil water content below the sand mixed layer. Across different treatments, the modifier river sand is more conducive to desalination of saline-alkali soils than the modifier biochar. Specially, the average desalination rate of treatment S3 is(14.5-27.7)% higher than that the treatments with biochar, and both the depth of the desalting zone and the depth of the standard desalting zone exceed the 0-50 cm soil layer with relatively high root density. Through the results of indoor one-dimensional vertical water infiltration test on the river sand and biochar, it is showed that the added sand to the soil surface layer can effectively improve the water and salt distribution of salinized soil in the Yellow River Delta, and provides a good environment for crop growth.
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Received: 12 April 2019
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