Comparison of15N2flux and acetylene inhibition denitrification methods in Atchafalaya River basin sediments

Autor:	Victor H. Rivera-Monroy, John A. Nyman, Charles W. Lindau, Amy E. Scaroni
Rok vydání:	2011
Předmět:	geography geography.geographical_feature_category Denitrification Ecology Drainage basin Hypoxia (environmental) Sediment Aquatic Science Swamp chemistry.chemical_compound Acetylene chemistry Nitrate Environmental chemistry Environmental science Ecology Evolution Behavior and Systematics
Zdroj:	Journal of Freshwater Ecology. 26:337-344
ISSN:	2156-6941 0270-5060
DOI:	10.1080/02705060.2011.557480
Popis:	Flooded swamps in the Atchafalaya River basin, Louisiana, USA, are thought to be a major mechanism for removing excess riverine nitrate that may be causing hypoxia in coastal Louisiana. Two denitrification methods, the 15N2 flux and acetylene inhibition technique, were compared and evaluated. Sediment samples were collected from three baldcypress swamp sites located within the Atchafalaya River basin. Highly 15N-labeled (61.7 at.%) and unlabeled nitrate (100 mg NO3–N L−1) were applied to the floodwater of separate sets of sediment cores. Denitrification potential was measured 2, 6, 10, and 16 days after nitrate addition. Two days after nitrate addition, no significant differences in denitrification rates were observed between methods. On days 6, 10, and 16, denitrification measured by the 15N2 method was higher compared to the acetylene inhibition procedure. When significance was observed, 15N2 denitrification was approximately 5.3 times greater.
Databáze:	OpenAIRE
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