Abstract: Saline-alkali land is widely distributed in China,and as a potential land type for increasing grain production,its scientific management is of great significance to ensure national food security and ecological security.The process of water,fertilizer and salt in saline-alkali soil and its synergistic regulation mechanism are not clear,which will lead to the difficulty of the corresponding improvement and utilization technology to achieve the expected results.In order to explore the current situation,mechanism,main technologies and future research directions of the dynamic regulation of soil water,fertilizer and salt in saline-alkali land in China,this paper first analyzes the relevant literature from 2010 to 2024,summarizes the hot spots and trends of saline-alkali land research,and finds that the number of published papers is increasing year by year,and the research enthusiasm in the field of saline-alkali land is increasing both domestically and internationally.Subsequently,the dynamic regulation mechanism of soil water,salt and water and fertilizer in saline-alkali land was discussed in detail,including the influence of natural and human factors on soil water and salt transport,and the role of water and fertilizer coupling technology in improving soil environment and crop yield.The improvement and regulation technologies related to saline-alkali land,such as drip irrigation under film,brackish water utilization,intelligent irrigation and organic fertilizer improvement,have shown remarkable effects in controlling soil salinity,improving water resource use efficiency and improving soil structure.However,there are still some problems in the research on the synergistic regulation of water,fertilizer and salt in saline-alkali land,such as the existing water-fertilizer coupling model still has great limitations when applied to saline-alkali land,and more targeted models need to be developed urgently.Future research should focus on precise salt control,carbon enhancement and emission reduction,and the application of new materials in saline-alkali land management,so as to promote technological innovation and practical development.It is suggested to strengthen interdisciplinary cooperation and combine big data and artificial intelligence technology to achieve scientific governance of saline-alkali land and ensure food security and ecological environment.

Key words: Dynamics of Water,Nutrients,and Salts, Saline Alkali Land, Water Conservation, Coordinated Regulation