**5. Conclusion**

Economic benefits could not justify the impacts of reclaiming land on coastal ecological degradation. Salinization is one of the major problems. Mitigation measures have been proposed, and some have successful achievements. However, most of these methods are based on experiences, and lack of theoretical bases. The effects of the mitigation measures on short‐ term and long‐term monitoring are still necessary in the complicated land reclamation regions to get full understanding of the mechanism of soil salinization.

Research including field investigation, modelling and analysis was carried out in land reclamation areas. Results show that under semi‐humid climate, the salinity problem in reclaimed land is severe. Driven by climate, vegetation and upstream freshwater supply, the migration of water and salt is dynamic. The processes could be classified as salt leaching, salt accumulation and the release process of salts from sediment. Measures should be taken to prevent the soil salinization. Major ways include rainwater utilization, conservation tillage, soil structure reform, desalination and sediment property modifying.
