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/s10533-006-9015-9Full text not available from this repository.
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.
|Programmes:||CEH Programmes pre-2009 publications > Biogeochemistry|
|CEH Sections:||_ Biogeochemistry & Ecosystem Function|
|Additional Keywords:||15N, fine roots, forests, N deposition, natural abundance|
|NORA Subject Terms:||Agriculture and Soil Science
Ecology and Environment
|Date made live:||13 May 2008 09:25|
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