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Growth and photosynthetic responses to elevated [C02] in grasses from Tasmanian native pasture

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Hovenden, MJ (2003) Growth and photosynthetic responses to elevated [C02] in grasses from Tasmanian native pasture. Papers and Proceedings of the Royal Society of Tasmania, 137. pp. 81-86. ISSN 0080-4703

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Abstract

Six species of grass (four C3 and two C4) from southeastern Australian native pastures were grown in controlled environment cabinets at current (~370 mol CO2 mol-I) and twice current (~750 mol CO2 mol-I) cabinet [C02]. Photosynthetic gas exchange and above-ground biomass were estimated after seven weeks. Cabinet [C02] had a highly significant impact on above-ground biomass (P<0.0003) with plants exposed to elevated [C02] having on average 78% greater above-ground biomass than the controls. The relative increase of above-ground biomass caused by elevated [C02] varied among species. [C02] during gas exchange measurements and species had highly significant impacts on carbon assimilation and evapotranspiration rates, stomatal conductance and water-use efficiency. Cabinet [C02] had a significant impact on carbon assimilation rate only, for which there was a significant cabinet [C02] x species interaction. Carbon assimilation rate was influenced by cabinet [C02] only for Poa labillardierei, but this may well be related to pot conditions. Three-factor analysis of variance found no interaction between cabinet [C02] and [C02] during photosynthetic measurements, further supporting a lack of photosynthetic acclimation to elevated [C02] in young plants of these temperate Australian grass species.

Item Type: Article
Keywords: Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title: Papers and Proceedings of the Royal Society of Tasmania
Page Range: pp. 81-86
ISSN: 0080-4703
Additional Information: Copyright Royal Society of Tasmania
Date Deposited: 18 May 2012 04:29
Last Modified: 18 Nov 2014 04:32
URI: http://eprints.utas.edu.au/id/eprint/13427
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