The article explores how coastal wetlands in Liaohe River Delta evolve over time. By studying different types of wetlands and plant communities, the researchers found that wetlands change into marsh and meadow areas due to factors like sand sedimentation, soil desalinization, and plant invasion. The evolution of underwater delta wetlands is the slowest, while shallow fresh water wetlands change the quickest. Some marsh and meadow wetlands have even transformed into crop communities.