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Regional Assessment of N saturation using foliar and root d15N

Pardo, L. H.; Templer, P. H.; Goodale, C. L.; Duke, S.; Groffman, P. M.; Adams, M. B.; Boeckx, P.; Boggs, J.; Campbell, J.; Colman, B.; Compton, J.; Emmett, B.; Gundersen, P.; Kjønaas, J.; Lovett, G.; Mack, M.; Magill, A.; Mbila, M.; Mitchell, M. J.; McGee, G.; McNulty, G.; Nadelhoffer, K.; Ross, D.; Ollinger, S.; Rueth, H.; Rustad, L.; Schaberg, P.; Schiff, S.; Schleppi, P.; Spoelstra, J.; Wessel, W.. 2006 Regional Assessment of N saturation using foliar and root d15N. Biogeochemistry, 80. 157-194. 10.1007/s10533-006-9015-9

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Abstract/Summary

N saturation induced by atmospheric N deposition can have serious consequences for forest health in many regions. In order to evaluate whether foliar may be a robust, regional-scale measure of the onset of N saturation in forest ecosystems, we assembled a large dataset on atmospheric N deposition, foliar and root and N concentration, soil C:N, mineralization and nitrification. The dataset included sites in northeastern North America, Colorado, Alaska, southern Chile and Europe. Local drivers of N cycling (net nitrification and mineralization, and forest floor and soil C:N) were more closely coupled with foliar than the regional driver of N deposition. Foliar increased non-linearly with nitrification:mineralization ratio and decreased with forest floor C:N. Foliar was more strongly related to nitrification rates than was foliar N concentration, but concentration was more strongly correlated with N deposition. Root was more tightly coupled to forest floor properties than was foliar . We observed a pattern of decreasing foliar values across the following species: American beech>yellow birch>sugar maple. Other factors that affected foliar included species composition and climate. Relationships between foliar and soil variables were stronger when analyzed on a species by species basis than when many species were lumped. European sites showed distinct patterns of lower foliar , due to the importance of ammonium deposition in this region. Our results suggest that examining values of foliage may improve understanding of how forests respond to the cascading effects of N deposition.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s10533-006-9015-9
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry
CEH Sections: _ Biogeochemistry & Ecosystem Function
ISSN: 0168-2563
Additional Keywords: 15N, fine roots, forests, N deposition, natural abundance
NORA Subject Terms: Agriculture and Soil Science
Ecology and Environment
Atmospheric Sciences
Date made live: 13 May 2008 09:25
URI: http://nora.nerc.ac.uk/id/eprint/2910

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