N2O Emissions from Streams in the Neuse River Watershed, North Carolina

We present N2O emission data from 11 sites in the Neuse River watershed. Emissions were measured using a static surface enclosure technique deployed on eight sites on the main river channel and three tributary sites. Ancillary data collected included dissolved oxygen, nitrate, total nitrogen, ammoni...

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Bibliographic Details
Published in:Environmental science & technology 2005-09, Vol.39 (18), p.6999-7004
Main Authors: Stow, Craig A, Walker, John T, Cardoch, Lynette, Spence, Porche, Geron, Chris
Format: Article
Language:English
Subjects:
Air Pollutants
Applied sciences
Atmospheric pollution
Creeks & streams
Dispersed sources and other
Emissions
Environmental Monitoring
Exact sciences and technology
Greenhouse gases
Linear Models
Models, Statistical
Monte Carlo Method
Nitrates
Nitrates - analysis
Nitrogen - analysis
Nitrogen Dioxide - analysis
North Carolina
Oxygen - analysis
Phosphorus - analysis
Pollution
Pollution sources. Measurement results
Regression Analysis
Rivers
Temperature
Water Movements
Water Pollutants
Watersheds
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Summary:We present N2O emission data from 11 sites in the Neuse River watershed. Emissions were measured using a static surface enclosure technique deployed on eight sites on the main river channel and three tributary sites. Ancillary data collected included dissolved oxygen, nitrate, total nitrogen, ammonium, dissolved organic carbon, total phosphorus, and temperature. Analysis using standard linear models, and classification and regression trees (CART), indicated nitrate to be the primary driving variable associated with N2O emission, although dissolved organic carbon concentration and water temperature were positively related with N2O emission as well. Relationships between nitrate concentration and N2O emission were consistent with those found in previous studies, although the data presented here represent the lower end of the range for both variables among published studies. Using our measured N2O emission rates along with literature values for the ratio of nitrogen gas to N2O produced during denitrification, we estimate N loss via denitrification in the Neuse River is approximately 17% of the annual N load delivered to the estuary.
ISSN:0013-936X
1520-5851
DOI:10.1021/es0500355