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

Smith, A.R. and Lukac, M. and Hood, R. and Healey, J.R. and Miglietta, F. Godbold D.L. (2013) Elevated CO2 enrichment induces a differential biomass response in a mixed species temperate forest plantation. New Phytologist, 198 (1). pp. 156-168. DOI: 10.1111/nph.12136

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Summary 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. 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. 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%). 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: Article
Subjects: Research Publications
Date Deposited: 09 Dec 2014 16:44
Last Modified: 23 Sep 2015 03:07
ISSN: 1469-8137
URI: http://e.bangor.ac.uk/id/eprint/909
Identification Number: DOI: 10.1111/nph.12136
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