| Effects of alteration irrigation on soil water and salt transport in moderately saline soil |
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| DOI：10.7606/j.issn.1000-7601.2018.06.01 |
| Key Words: moderately saline-sodic soil, alteration irrigation soil salinity evaluation index |
| Author Name | Affiliation | | LIU Xiao-yuan | Institute of Environmental and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100086
Institute of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255049, China | | ZHANG Qing-wen | Institute of Environmental and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100086, China | | GAO Pei-ling | Institute of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255049, China
Institute of Resources and Environment Engineering, Shandong University of Technology,Zibo, Shandong 255049, China | | YANG Da-Ming | Institute of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255049，China |
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| Abstract: |
| One dimensional vertical infiltration experiments were carried out to explore characteristics of water and salt transport in soil under alteration irrigation (AI)in moderately saline soil and evaluate the indexes of salinity distribution. The results showed that: (1)The soil water content with the AI treatment was higher than that with sole freshwater irrigation (F), but slightly differed from that of the sole brackish water irrigation (B). The variation coefficients of soil water content in soil after the irrigation sequence of brackish water irrigation followed by fresh water (B-F) varied from 9.24 to 16.62, which were less than that of irrigation of fresh water first followed by brackish water (F-B):(2)Within the same soil depth, the soil salinity content of treatment AI was less than that of treatment B, but slightly differed from treatment F.In the top 20 cm soil layers, the soil salinity content of treatments F-B was greater than that of B-F, but in 20~55 cm soil layers, the soil salinity content of treatments B-F was greater than that of F-B; (3)The analyses of the evaluation indexes of salinity distribution in dicated that the peak value of soil salinity of treatment B-F was greater than that of F-B. The soil desalination zone varied from 47.97 to 51.63 cm depth and the complied desalination zone varied from 46.6 to 50.7 cm, which was deeper than depth of dense crop roots (0~45 cm). The average desalination rate (0.36~0.543) and the peak value of soil salinity (3.741~5.967) in treatments ICI were higher than that in B, indicating that the ICI is more favorable than other irrigation methods to provide suitable soil water-salt environment for crops growth. |
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