The removal effect of phosphorus in SSF and FWS units is not noticeable, probably due to the saturation of soil adsorption after more than two years operating for the FWS unit.

• 潜流和表流区除磷效果不明显，可能是因为湿地运行了两年多，土壤吸附交换达到平衡，影响了表流区的除磷效果。