Numerical and graphical procedures for estimation of community photosynthesis and respiration in experimental streams.

A NUMERICAL DISSOLVED OXYGEN (D. O. ) ROUTING MODEL DORM ISDEVELOPED TO DETERMINE THE TOTAL STREAM COMMUNITY PHOTOSYNTHESIS (P) AND COMMUNITY RESPIRATION RATES (R) THROUGH SUCCESSIVE ROUTING OF TWO-STATION DIEL D. O. MEASUREMENTS IN A STREAM. THE MODEL USES THE COMPLETE D. O. TRANSPORT EQUATION, INCLUDING D. O. SURFACE EXCHANGE, LONGITUDINAL DISPERSION, DEPENDENCE OF RESPIRATORY RATES ON WATER TEMPERATURE AND DISSOLVED OXYGEN. THE MOEL IS APPLIED TO THE EXPERIMENTAL FIELD CHANNELS AT THE USEPA MONTICELLO ECOLOGICAL RESEARCH STATION TO COMPUTE P AND R VALUES AT DIFFERENT SEASONS AND UNDER DIFFERENT CONDITIONS OF WATER TEMPERATURES, SOLAR RADIATION, AND PH.