Soil denitrification fluxes from three northeastern North American forests across a range of nitrogen deposition

TitleSoil denitrification fluxes from three northeastern North American forests across a range of nitrogen deposition
Publication TypeJournal Article
Year of Publication2014
AuthorsMorse, JL, Durán, J, Beall, F, Enanga, EM, Creed, IF, Fernandez, I, Groffman, PM
JournalOecologia
Pagination1 - 11
Date Published2014/11/19/
ISBN Number0029-8549, 1432-1939
KeywordsEcology, Hydrology/Water Resources, nitrification, Nitrogen deposition, Nitrogen enrichment, nitrous oxide, Northern forests, Plant Sciences, Soil oxygen
Abstract

In northern forests, large amounts of missing N that dominate N balances at scales ranging from small watersheds to large regional drainage basins may be related to N-gas production by soil microbes. We measured denitrification rates in forest soils in northeastern North America along a N deposition gradient to determine whether N-gas fluxes were a significant fate for atmospheric N inputs and whether denitrification rates were correlated with N availability, soil O2 status, or forest type. We quantified N2 and N2O fluxes in the laboratory with an intact-core method and monitored soil O2, temperature and moisture in three forests differing in natural and anthropogenic N enrichment: Turkey Lakes Watershed, Ontario; Hubbard Brook Experimental Forest, New Hampshire; and Bear Brook Watershed, Maine (fertilized and reference plots in hardwood and softwood stands). Total N-gas flux estimates ranged from 100 kg N ha−1 year−1 in hardwood wetlands at Turkey Lakes. N-gas flux increased systematically with natural N enrichment from soils with high nitrification rates (Bear Brook

URLhttp://link.springer.com/article/10.1007/s00442-014-3117-1
Short TitleOecologia