Rooted Aquatic Plant Effects on Nitrogen Budgets

by Kenneth I. Trask, Project Engr.; DuBois and King, Inc., Randolph, Vt. 05060,
Frederic C. Blanc, (M.ASCE), Assoc. Prof.; Dept. of Civ. Engrg., Northeastern Univ., Boston, Mass. 02115,
James C. O'Shaughnessy, (A.M.ASCE), Assoc. Prof.; Dept. of Civ. Engrg., Northeastern Univ., Boston, Mass. 02115,


Serial Information: Journal of the Environmental Engineering Division, 1981, Vol. 107, Issue 3, Pg. 481-492


Document Type: Journal Paper

Abstract: The nitrogen nutrient budget was determined for river surface water and its relationship to rooted aquatic plants. Rooted aquatic plants were tested using bioassay techniques and standing crop estimates, concurrent with surface water quality measurements. Analysis of both NH4+-N absorption and nitrogen tissue content indicated that the rooted aquatic plants were not nitrogen-limited within the areas studied. Bottom deposit type and river velocities were the controlling factors for plant growth in the study areas. Water quality analysis showed sufficient nitrogen to support abundant growth in all areas. The NH4+-N absorption rates for individual plants was found to be a function of plant age. The amount of nitrogen removed from the overlying water column represents a small percentage of the nitrogen budget for the river flow.

Subject Headings: Vegetation | Nitrogen | Aquatic habitats | Budgets | Water quality | Surface water | Absorption | Nutrients | North America | New Hampshire | United States

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