Subjects: Geosciences >> Geography submitted time 2023-09-19 Cooperative journals: 《干旱区地理》
Abstract： Soil salt crust has an important impact on soil evolution and ecohydrological processes in arid areas.There are few recent studies on water and salt distribution characteristics in salt-crust soils, and the influence ofsalt-crust thickness is not considered, leading to great differences in research results. Therefore, in this paper, fourinitial salt concentration treatments (0 g·L−1, 10 g·L−1, 150 g·L−1, and 250 g·L−1) were set to obtain different saltcrust thicknesses (4.5 mm, 6.6 mm, 7.3 mm) through laboratory simulation tests, and the soil-profile dynamics ofwater and salt were compared and analyzed using a partial repeated stepwise withdrawal method. The resultswere as follows: (1) Compared with the non-salt treatment, the thicker the salt crust, the larger the soil-profile water content, and the smaller the salt-content variation range. (2) At the end of the experiment, the water contentdistribution characteristics of the 4.5 mm salt-crust soil were similar to those of the unsalted treatment, and thewater contents of the 6.6 mm and 7.3 mm salt-crust soils were significantly higher than that of the unsalted treatment (P<0.05). (3) At the end of the test, the minimum salt contents of the 4.5 mm, 6.6 mm, and 7.3 mm saltcrust soils decreased by 90.5%, 46.3%, and 32.1%, respectively, compared with their initial salt contents. The results confirm that salt-crust thickness has a great influence on the distribution of soil water and salt. Therefore, itis suggested that the influence of salt-crust thickness should be considered comprehensively in future research ondistribution characteristics of water and salt.
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