Estuaries nitrogen species

Simon, N.S., and Kennedy, M.M. (1987) The distribution of nitrogen species and adsorption of ammonium in sediments from the tidal Potomac River and Estuary. Estuar. Coastal Shelf Sci. 25, 11-26. 

Carpenter, E. J., and Dunham, S. (1985). Nitrogenous nutrient uptake, primary production, and species composition of phytoplankton in the Carmans River estuary. Long Island, New York. Limnol. Oceanogr. 30, 513—526. 

Other models have been proposed which follow the outlines of the equations already discussed. Equations with parameters that vary as a function of temperature, sunlight, and nutrient concentration have been presented by Davidson and Clymer (9) and simulated by Cole (10). A set of equations which model the population of phytoplankton, zooplankton, and a species of fish in a large lake have been presented by Parker (II). The application of the techniques of phytoplankton modeling to the problem of eutrophication in rivers and estuaries has been proposed by Chen (12). The interrelations between the nitrogen cycle and the phytoplankton population in the Potomac Estuary has been investigated using a feed-forward-feed-back model of the dependent variables, which interact linearly following first order kinetics (13). 

The availability of reactive nitrogen limits photosynthesis in a wide variety of terrestrial and marine ecosystems. Nitrogen limitation is particularly common in temperate and boreal forests, temperate grasslands, and Arctic and subalpine tundra, and in estuaries and coastal marine ecosystems in temperate zones.Introduction of relatively large external inputs of the nutrient must be expected to change the productivity of affected ecosystems, as well as the modes of their nitrogen storage and composition of their species. 

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