Access Restriction

Author Gardner, Wayne S. ♦ Mccarthy, Mark J. ♦ An, Soonmo ♦ Sobolev, Dmitri ♦ Sell, Karen S. ♦ Brock, David
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Texas Estuary ♦ Nitrogen Dynamic ♦ Internal Nitrogen ♦ Laguna Madre ♦ Nh Production Rate ♦ Total Denitrification ♦ N2 Source ♦ Inflow Water ♦ Retention Mechanism ♦ Different Salinity ♦ Intact Sediment Core ♦ Net Nitrate ♦ Net N2 Flux ♦ Sabine Lake ♦ Slight Uptake ♦ Continuous-flow Experiment ♦ Near Zero ♦ Negative Value ♦ Mean Net N2 Flux ♦ Nueces Estuary ♦ Mean Ammonium ♦ East Matagorda Bay ♦ Potential Dissimilatory Reduction
Abstract We conducted continuous-flow experiments on intact sediment cores from Laguna Madre, Sabine Lake, East Matagorda Bay, and Nueces Estuary to evaluate internal nitrogen (N) sources, sinks, and retention mechanisms in Texas estuaries having different salinities. Mean ammonium (NH 4) flux ranged from slight uptake (negative values) to NH production rates of about 300 �mol m�2 h�1 � 4 (units used for all N rates) and increased with salinity (p � 0.10). Net nitrate (NO 3) flux (�20 to 32) and net N2 flux (�70 to 100) did not relate to salinity. Mean net N2 flux was positive but near zero, indicating that N2 sources and sinks are nearly balanced. Total denitrification, N fixation, and potential dissimilatory NO reduction to NH (DNRA) rates were estimated after inflow water was enriched
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study