EFFECTS OF TYPICAL CONCENTRATIONS OF NITROGEN AND PHOSPHORUS IN AGRICULTURAL TREATMENT WETLANDS ON POLYCULTURES OF TYPHA LATIFOLIA L. AND JUNCUS EFFUSUS L. AND A TEST OF THE N:P RATIO AS A PREDICTIVE TOOL.

摘要: Title of Thesis: EFFECTS OF TYPICAL CONCENTRATIONS NITROGEN AND PHOSPHORUS IN AGRICULTURAL TREATMENT WETLANDS ON POLYCULTURES TYPHA LATIFOLIA L. JUNCUS EFFUSUS A TEST THE N:P RATIO AS PREDICTIVE TOOL. Timothy W. Culbertson, Master Science, 2005 Thesis Directed By: Associate Professor Andrew H. Baldwin, Department Marine-Estuarine-Environmental Science Nitrogen removal in agricultural treatment wetlands is determined by the health macrophytes. removed microbes dependant on an oxic-anoxic boundary layer created oxygen flow through macrophyte culms and nitrogen sequestration plant biomass. Phytotoxic ammonia concentrations can limit growth. Orthophosphate fertilization to balance phosphorus tissue ratio may increase One test this hypothesis investigated Juncus effusus Typha latifolia phytotoxicity: above 150 mgL suppress growth 300 do not affect The second experiment altered mesocosm ratios. Some alleviation toxicity was shown; highest biomass production at toxic levels occurred a 15:1experimental ratio. two species used N P differently: average 12:1 9.1:1 Typha. More effective waste be based upon more precise control