The Dynamics of Soil Moisture and Salinity after Using Saline Water Freezing-Melting Combined with Flue Gas Desulfurization Gypsum
Ye Xiao1,2, Zhi-Gang Huang3, Fan Yang1, Xian-Guo Lu1
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1Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China
2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
3Nanyang Normal University, Nanyang 473061, China
Pol. J. Environ. Stud. 2014;23(5):1763–1772
A laboratory experiment was conducted in soil columns to study the moisture and salt redistribution through soil profile after the application of saline ice melt-water (SIMW) and flue gas desulfurization gypsum (FGDG) in a saline-sodic soil. The study consisted of SIMW (3200 ml frozen saline groundwater) and four SIMW+FGDG treatments which were SIMW+25%GR (7.9 mg·cm-2, gypsum require (GR) in the surface of soil column), SIMW+50%GR (15.9 mg·cm-2), SIMW+70%GR (23.8 mg·cm-2), and SIMW+100%GR (31.8 mg·cm-2). The results showed that Na+ content, EC, SAR, and pH were reduced near the surface layers in all treatments, but the trend was reversed in deeper soil layers. Comparing the SIMW treatments, treatments containing FGDG showed higher desalting rate, leaching depth, and soil moisture at the end of the experiment. The SIMW+50%GR treatment resulted in the highest leaching rate of Na+ and lowest EC and SAR in 0-40 cm soil layer. With the increase of the applied FGDG, there was no significant difference in reclamation effect. Therefore, when the small amount of gypsum was added in conjunction with saline ice meltwater, better leached effect of sodium was achieved.