Relationship between Chemically Determined and Biologically Available Forms of Phosphorus in Lakes and Streams

摘要

Concentrations of total, total dissolved, soluble reactive and bioavailable phosphorus were determined monthly for three years in two proximal reservoirs and their major tributaries. Spruce Run reservoir was a eutrophic on-stream impoundment, and Round Valley reservoir was a mesotrophic pumped storage body of water. Baseflow and stormflow conditions were monitored for the main tributaries of Spruce Run reservoir. Temperature, light transmission, dissolved oxygen concentration and chlorophyll a levels were measured monthly in both reservoirs. Stormflows contributed about 33% of the annual TP load from Spruce Run Creek and 53% from Mulhockaway Creek to Spruce Run reservoir. Phosphorus budgets were assembled for both reservoirs and used to compare predicted TP concentrations to those observed. The Dillon-Rigler model accurately predicted the observed annual mean TP concentrations.