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Effects of elevated CO2 and nutrient supply on the seasonal growth and morphology of Agrostis capillaris.

Newbery, R. M. and Wolfenden, J. (1996) Effects of elevated CO2 and nutrient supply on the seasonal growth and morphology of Agrostis capillaris. New Phytologist, 132 (3). pp. 403-411. ISSN 1469-8137

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Abstract

Responses to elevated CO2 have been studied using an upland grass species, Agrostis capillaris L. The plants were grown in sand culture with a range of N, P and K concentrations, in 'Solardome' growth chambers with either ambient air or a CO2 concentration of 250μmol CO2 mol−1 above ambient The interactive effects of high CO2 and nutrient supply (in plant growth and morphology were monitored throughout the growing season. A. capillaris exhibited positive growth responses to enhanced CO2 even at limiting supplies of N and P. Moreover, greater shoot mass at elevated CO2 was attributed to disproportionate increases in leaf and tiller number, resulting in an increase in the average leaf number per tiller. However, total leaf area remained unaffected, indicating that leaf size was reduced. There was no evidence of any acclimation in the growth response of A. capillaris to additional CO2, even in N and P-stressed plants. On the contrary, a stimulation in leaf production was observed later in the growing season. A consistent interaction was observed between N and P concentrations, whereby the response to one element was greater at higher concentrations of the other. In addition, there were indications of competition among the three elements for uptake at the root. These findings indicate the importance of multifactorial nutrient experiments in developing an understanding of the complex relationships during CO2 enrichment.

Item Type: Article
Journal or Publication Title: New Phytologist
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 22142
Deposited By: ep_ss_importer
Deposited On: 13 Feb 2009 15:16
Refereed?: No
Published?: Published
Last Modified: 26 Jul 2012 15:56
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22142

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