Abstract: A laboratory simulation experiment was conducted to study the phosphorus adsorption/ desorption characteristics of wetland soil in Panjin, Liaoning Province under different redox conditions. Langmuir model and Freundlich model were used to fit the phosphorus  desorption processes. Under both anaerobic and aerobic conditions, the phosphorus adsorption/ isotherms could be successfully fitted by the two models, and Langmuir model had better fitting effect. Under flooding, the maximum phosphorus adsorption and desorption rates decreased, with an average decrement being 9.5% and 16.3%, respectively, while the phosphorus adsorption/ desorption equilibrium mass concentration increased remarkably, with an average increment of 158.8%. The soil amorphous Fe content also increased obviously after flooding, and had significant correlation with the phosphorus adsorption desorption equilibrium mass concentration but less correlation with the maximum phosphorous adsorption and desorption rates, suggesting that soil amorphous Fe was one of the most important factors affecting the phosphorus adsorption/ desorption equilibrium mass concentration under flooding.

Key words: Anthocephalus chinensis, Heat dissipation, Horsfieldia tetratepala, Photosynthesis, Pometia tomentosa, Seedlings, Tropical rain forest tree species