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An ecological dynamic model based on phosphorus cycling of ecosystem was developed for Hanshiqaio wetland in North China. The state variables include dissolved inorganic phosphorus (P), duckweed (FP), submerged plant (SP), phytoplankton (A), zooplankton (Z), detritus (D) and dissolved inorganic phosphorus in pore water (PPP). In this study, a sub-model of duckweed was developed and integrated with other sub-models of submerged plants and phytoplankton into one comprehensive model. This model was calibrated and validated based on the data of three types of water areas with different ecological conditions. The simulation value and observation value agree well. This model is then used to evaluate the effects of ecological restoration methods. Three ecological restoration methods were set to predict the trend of P concentrations following the change of controlling methods for duckweed. We should harvest all duckweed before August and introduce duckweed into wetland after August to achieve better effect of ecological restoration. The model provides theoretical guidance and technical support for wetland ecological restoration.

Development of an Ecological Dynamic Model for a Duckweed-Donated Urban Eutrophic Wetland