Freshwater nutrient management

Therefore, preservation of acceptable water quahty and reversal of eutrophication in these systems will invariably include reductions of current loads and setting limits on new N input, either alone or in combination with other nutrient (e.g., P) input reductions. Freshwater nutrient management has, in many instances, successfully arrested and reversed eutrophication by reducing P loadings (Edmondson, 1970 Likens, 1972 VoUenweider, 1982). Indeed, the upstream freshwater portions of many estuaries are also P-Hmited (Boynton and Kemp, 2000 Fisher et al, 1999), and P input constraints in these waters have been quite successful in reducing the unwanted symptoms of eutrophication (nuisance algal blooms, toxicity, hypoxia,... 

Increased riverine NO( concentrations due to human activity (see below) mean that DIP is now the main limiting nutrient for plant growth in many freshwaters. The consequent relationship between DIP and chlorophyll levels (a measure of algal biomass) (Fig. 5.11) makes the management of phosphorus inputs to rivers and lakes very important. In some areas DIP inputs are consequently stringently... 

Stow, C. A., R. D. DeLaune, and W. H. Patrick, Jr. 1985. Nutrient fluxes in a eutrophic coastal Louisiana freshwater lake. Environ. Manage. 9 243. 

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