A NUTRIENT-BASED MODEL OF EMERGENT MACROPHYTES IN A SOUTHERN FLORIDA EVERGLADES WETLAND

摘要

This paper presents an overview of the development and application of a time-variablernnutrient based emergent macrophyte model to a southern Florida Everglades wetlandsrnsystem. The model formulation includes the effects of nutrient concentrationsrn(dissolved inorganic phosphorus and dissolved inorganic nitrogen) on Cladiumrnjamaicensis (sawgrass) and Typha domingensis (cattail) plant growth, nutrientrnuptake, and nutrient composition. Included in the model are the kinetics of leaf litterrndecomposition and associated changes in litter nutrient content. The macrophyternmodel is part of an overall wetlands water quality model being developed to assist inrnthe design and optimization of a series of constructed wetlands being built to reducernphosphorus levels in agricultural stormwater runoff before it enters the Evergladesrnecosystem. The model is applied to a number of data sets collected in the WaterrnConservation Areas, located in the northern Everglades, which encompass a widernrange of nutrient concentrations. The assumptions of the model are shown to be inrngeneral agreement with field observations and model computations compare favorablyrnwith data for emergent macrophytes observed under nutrient enriched and nutrientrnunenriched conditions.