Elevated CO2 enrichment induces a differential biomass response in a mixed species temperate forest plantation

Smith, Andrew R.; Lukac, Martin; Hood, Robin; Healey, John R.; Miglietta, Franco; Godbold, Douglas L.. 2013 Elevated CO2 enrichment induces a differential biomass response in a mixed species temperate forest plantation. New Phytologist, 198 (1). 156-168. 10.1111/nph.12136

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Abstract/Summary

1. In a free-air carbon dioxide (CO2) enrichment study (BangorFACE), Alnus glutinosa, Betula pendula and Fagus sylvatica were planted in areas of one-, two- and three-species mixtures (n = 4). The trees were exposed to ambient or elevated CO2 (580 μmol mol−1) for 4 yr, and aboveground growth characteristics were measured. 2. In monoculture, the mean effect of CO2 enrichment on aboveground woody biomass was + 29, + 22 and + 16% for A. glutinosa, F. sylvatica and B. pendula, respectively. When the same species were grown in polyculture, the response to CO2 switched to + 10, + 7 and 0% for A. glutinosa, B. pendula and F. sylvatica, respectively. 3. In ambient atmosphere, our species grown in polyculture increased aboveground woody biomass from 12.9 ± 1.4 to 18.9 ± 1.0 kg m−2, whereas, in an elevated CO2 atmosphere, aboveground woody biomass increased from 15.2 ± 0.6 to 20.2 ± 0.6 kg m−2. The overyielding effect of polyculture was smaller (+ 7%) in elevated CO2 than in an ambient atmosphere (+ 18%). 4. Our results show that the aboveground response to elevated CO2 is affected significantly by intra- and interspecific competition, and that the elevated CO2 response may be reduced in forest communities comprising tree species with contrasting functional traits.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1111/nph.12136
Programmes:	CEH Topics & Objectives 2009 - 2012 > Biodiversity
UKCEH and CEH Sections/Science Areas:	Emmett
ISSN:	0028-646X
Additional Information. Not used in RCUK Gateway to Research.:	This document is the author’s final manuscript version of the journal article, incorporating any revisions agreed during the peer review process. Some differences between this and the publisher’s version remain. You are advised to consult the publisher’s version if you wish to cite from this article. The definitive version is available at http://onlinelibrary.wiley.com
Additional Keywords:	alder (Alnus glutinosa), allometry, European beech (Fagus sylvatica), freeair CO2 enrichment (FACE), overyielding, polyculture, silver birch (Betula pendula), temperate forest
NORA Subject Terms:	Ecology and Environment
Date made live:	06 Feb 2013 15:02 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/21385

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