Figure 4. The details of the conceptual model of vertical solutions of ecosystem processes are shown. Model state variables are in oval boxes, linked by the major flow pathways among those variables. The periphyton (algal/microbial community) state variables can be considered functionally equivalent to an aquatic algal community. Abbreviations: P = Phosphorus; C = Carbon; Cl = Chloride; OM = Organic Matter; Photo-Bio = Photosynthetic Biomass of macrophytes; NonPhoto-Bio = NonPhotosynthetic Biomass of macrophytes; Floc = Flocculent detritus layer on/above soil.