Research progress of numerical simulation of wetland plant ecology and research example of Poyang Lake wetland
The structure and spatial distribution pattern of wetland plant communities play a decisive role in the structure and function of wetland ecosystems.Traditional field monitoring and controlled experiments have limitations in studying the large-scale structure and spatial distribution of wetland plant communities,and there are deficiencies in establishing the organic link between"ecological process-spatial pattern"and predicting dynamic changes.Therefore,mathematical models have become an important tool for studying the expansion,spatial distri-bution and interrelationships of wetland plant populations.By reviewing the relevant research literature at home and abroad and according to the degree of model description of ecological mechanisms and spatial patterns,wetland plant simulation can be divided into three types:statistical models,species distribution models and population dy-namics models.Although the current wetland plant models have made some progress in the theoretical and methodo-logical aspects,the spatiotemporal matching problem between the environmental condition module and the plant module,and the mechanism integration problem of the life history process of wetland plants significantly restrict the rationality and accuracy of the models.Finally,taking the Poyang Lake,a large-scale lake wetland connected to a river as an example,a wetland plant simulation framework driven by hydrodynamics was constructed,and the development direction of wetland plant simulation was proposed from two aspects of mechanism and application.On the mechanism level,the ecological mechanism support should be strengthened based on the unique hydrological process of the river-connected lake.On the application level,the focus should be on the hydrological situation un-der the change of the river-lake relationship,coupling the population dynamics method on the basis of the hydrody-namic model,depicting the vegetation succession dynamics and spatial pattern,and carrying out comparison verifi-cation by field investigation and remote sensing impact comparison,to improve the model accuracy.