Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 405072
Title Free atmospheric CO2 enrichment increased above ground biomass but did not affec symbiotic N2-fixation and soil carbon dynamics in a mixed deciduous stand in Wales
Author(s) Hoosbeek, M.R.; Lukac, M.; Velthorst, E.J.; Smith, A.R.; Godbold, D.
Source Biogeosciences 8 (2011)2. - ISSN 1726-4170 - p. 353 - 364.
DOI https://doi.org/10.5194/bg-8-353-2011
Department(s) Earth System Science
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) rotation poplar plantation - nitrogen-use efficiency - natural n-15 abundance - elevated co2 - organic-matter - pine forest - dinitrogen fixation - alnus-glutinosa - mineral soil - face
Abstract Through increases in net primary production (NPP), elevated CO2 is hypothesized to increase the amount of plant litter entering the soil. The fate of this extra carbon on the forest floor or in mineral soil is currently not clear. Moreover, increased rates of NPP can be maintained only if forests can escape nitrogen limitation. In a Free atmospheric CO2 Enrichment (FACE) experiment near Bangor, Wales, 4 ambient and 4 elevated [CO2] plots were planted with patches of Betula pendula, Alnus glutinosa and Fagus sylvatica on a former arable field. After 4 years, biomass averaged for the 3 species was 5497 (se 270) g m-2 in ambient and 6450 (se 130) g m-2 in elevated [CO2] plots, a significant increase of 17% (P = 0.018). During that time, only a shallow L forest floor litter layer had formed due to intensive bioturbation. Total soil C and N contents increased irrespective of treatment and species as a result of afforestation. We could not detect an additional C sink in the soil, nor were soil C stabilization processes affected by elevated [CO2]. We observed a decrease of leaf N content in Betula and Alnus under elevated [CO2], while the soil C/N ratio decreased regardless of CO2 treatment. The ratio of N taken up from the soil and by N2-fixation in Alnus was not affected by elevated [CO2]. We infer that increased nitrogen use efficiency is the mechanism by which increased NPP is sustained under elevated [CO2] at this site
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