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.

Simple item page
dc.contributor.advisorBaldwin, Andrew H.en_US
dc.contributor.authorculbertson, timen_US
dc.contributor.departmentMarine-Estuarine-Environmental Sciencesen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2005-10-11T09:44:47Z
dc.date.available2005-10-11T09:44:47Z
dc.date.issued2005-08-29en_US
dc.description.abstractNitrogen removal in agricultural treatment wetlands is determined by the health of macrophytes. Nitrogen is removed by microbes dependant on an oxic-anoxic boundary layer created by oxygen flow through macrophyte culms and by nitrogen sequestration in plant biomass. Phytotoxic ammonia concentrations can limit plant growth. Orthophosphate fertilization to balance the nitrogen to phosphorus tissue ratio may increase biomass. One test of this hypothesis investigated <i>Juncus effusus</i> and <i>Typha latifolia</i> ammonia phytotoxicity: ammonia concentrations above 150 mgL-1 suppress <i>Typha</i> growth and above 300 mgL-1 do not affect <i>Juncus</i> growth. The second experiment altered mesocosm N:P ratios. Some alleviation of ammonia toxicity was shown; highest biomass production at toxic levels occurred at a 15:1experimental N:P ratio. The two species used N and P differently: the average N:P ratio was 12:1 in <i>Juncus</i> and 9.1:1 in <i>Typha</i>. More effective waste removal may be based upon more precise control of N:P ratios.en_US
dc.format.extent1060389 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/2822
dc.language.isoen_US
dc.subject.pqcontrolledBiology, Ecologyen_US
dc.subject.pquncontrolledammoniaen_US
dc.subject.pquncontrollednitrogen:phosphorus ratioen_US
dc.subject.pquncontrolledTyphaen_US
dc.subject.pquncontrolledJuncusen_US
dc.subject.pquncontrolledagricultural treatment wetlanden_US
dc.titleEFFECTS 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.en_US
dc.typeThesisen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
umi-umd-2816.pdf
Size:
1.01 MB
Format:
Adobe Portable Document Format
Download

Collections

UMD Theses and Dissertations
Biology Theses and Dissertations
MEES Theses and Dissertations