Lin Gao; Yang Qiu; Zhiye Wang; Chuanming Ma*
China University of Geosciences (Wuhan)
Soil salinization is when salinity in groundwater accumulates on the surface with pore water under capillary action and evaporation. The cumulative process can be affected by many factors, such as precipitation, evaporation, topography, vegetation, groundwater, etc. In coastal areas, the salinization of groundwater caused by seawater intrusion, the salinity of rainfall caused by storm surges, and the leaching of soil salinity caused by pumping irrigation may induce soil salinization. There needs to be quantitative research on soil salinization aiming at the water-salt transport chain in the hydrological process above the coastal area. This study selected the southern coastal plain of Laizhou Bay, the most affected area by seawater intrusion disasters in China, as the study area. Using δ18O and δD stable isotope, hydrogeological, and geochemistry methods, the contribution of groundwater salinization caused by seawater intrusion, precipitation, and pumping irrigation to soil salinization was quantitatively analyzed.