Baltimore Ecosystem Study Institute of Ecosystem Studies

2010 BES Annual Meeting Presentation and Poster Abstracts

Nitrogen deposition along an urban-rural land-use gradient in Baltimore MD
Bettez, Neil
Co-Authors: Neil D. Bettez, Peter Groffman, Cary institute of Ecosystem Studies, Millbrook, NY; 845-677-7600

Abstract: Excess nitrogen (N) is a serious water-quality problem in most of the estuaries in the US. A first step in addressing this problem is to quantify the fluxes of N in coastal watersheds. This typically involves constructing input-output N budgets in which a single estimate of N deposition (usually from the nearest NADP/CASTNet site) is used. However, recent studies have documented that a portion of mobile source emissions are deposited near where they are produced potentially resulting in an underestimate of N inputs in urban areas. In this study are measuring N inputs from wet and dry deposition to watersheds across an urban - rural gradient in Baltimore. Wet and dry deposition will be estimated from bulk and throughfall measurements made using mixed bed ion exchange resins. These results will address the need to account for the impact of local emissions on N deposition when constructing N budgets in human dominated systems.