Review on water environment evolution and strategy after land reclamation

Secondary salinization and underground structures erosion usually occurs in reclaimed regions, especially in the climate conditions that annual evaporation is much larger than annual rainfall in north China. Based on a brief review of the status and trends of land reclamation, this paper summarized the evolution of groundwater system and soil environment, and analyzed the main reasons contributing to these problems. Comparison of the climate differences between humid areas and semiarid areas, it was pointed out that the key to soil salinity control in the semiarid region was to guide the law of nature by utilizing rainwater and flood resources to build a long-term leaching mechanism. Meanwhile, in order to rebuild and maintain a healthy and stable ecosystem in the reclaimed areas, it was critical to plan the structure of soil layers, enhance the salt leaching and plant the green vegetation according to the local conditions.