Uncertainties in the relationship between atmospheric nitrogen deposition and forest catbon sequestration

Sutton, Mark A. ORCID:; Simpson, David; Levy, Peter E. ORCID:; Smith, Rognvald I.; Reis, Stefan ORCID:; Van Oijen, Marcel; de Vries, Wim. 2008 Uncertainties in the relationship between atmospheric nitrogen deposition and forest catbon sequestration. Global Change Biology, 14 (9). 2057-2063.

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In a recent study, Magnani et al. report how atmospheric nitrogen deposition drives stand-lifetime net ecosystem productivity (NEPav) for midlatitude forests, with an extremely high C to N response (725 kg C kg−1 wet-deposited N for their European sites). We present here a re-analysis of these data, which suggests a much smaller C : N response for total N inputs. Accounting for dry, as well as wet N deposition reduces the C : N response to 177 : 1. However, if covariance with intersite climatological differences is accounted for, the actual C : N response in this dataset may be <70 : 1. We then use a model analysis of 22 European forest stands to simulate the findings of Magnani et al. Multisite regression of simulated NEPav vs. total N deposition reproduces a high C : N response (149 : 1). However, once the effects of intersite climatological differences are accounted for, the value is again found to be much smaller, pointing to a real C : N response of about 50-75 : 1. Keywords: atmospheric deposition models; biogeochemical models; carbon sequestration; chronosequences; forest growth; greenhouse gas budgets; net ecosystem productivity; nitrogen deposition; regression analysis; uncertainty

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry
UKCEH and CEH Sections/Science Areas: Billett (to November 2013)
ISSN: 1354-1013
Additional Keywords: atmospheric deposition models, biogeochemical models, carbon sequestration, chronosequences, forest growth, greenhouse gas budgets, net ecosystem productivity, nitrogen deposition, regression analysis, uncertainty
NORA Subject Terms: Atmospheric Sciences
Date made live: 19 Feb 2009 10:31 +0 (UTC)

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