Community Ecology
Volume/Issue:
Volume 9: Issue Supplement-1
Effects of elevated air CO 2 concentration on loess grassland vegetation as investigated in a mini FACE experiment
Authors:
Z. Nagy Szent István University Institute of Botany and Plant Ecophysiology 2103 Gödöllő Páter K. u. 1 Hungary

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and
Z. Tuba Szent István University Institute of Botany and Plant Ecophysiology 2103 Gödöllő Páter K. u. 1 Hungary

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Pages:
153–160
Online Publication Date:
15 Jan 2009
Publication Date:
01 Jun 2008
Article Category:
Research Article
DOI:
https://doi.org/10.1556/comec.9.2008.s.20
Keywords:
Acclimation of photosynthesis; Canopy surface temperature; Elevated air CO 2 concentration; Grassland; Leaf area index; Leaf carbohydrate concentration
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Stand and leaf scale responses of loess grassland swards to elevated air CO 2 concentration had been investigated in a mini FACE system during 1998–2000. The study concentrated on biomass, leaf area index (LAI) and vegetation surface temperature (stand scale) and on diurnal carbohydrate pattern and gas-exchange responses (leaf scale). Leaf net CO 2 uptake under prolonged exposure to elevated CO 2 showed an upward response in the dicotyledonous and a downward one in the monocotyledonous species. Dawn and evening carbohydrate levels in leaves suggested growth stimulation of the dicot under elevated CO 2 and the opposite for the grass species and indicated sink limitation as a major factor determining photosynthetic acclimation at the species level. The smaller LAI as well as the insignificant biomass response to elevated air CO 2 was a compounded response by multi-species stands. Under mild water shortage, elevated air CO 2 concentration partly alleviated the drought effect shown by the higher relative growth rate of LAI. Canopy surface temperatures of the vegetation in the CO 2 enriched rings were higher than those in the ambient rings suggesting that decreased leaf conductance and transpiration were responsible for the temperature difference between the treatments. Increased canopy surface temperature under elevated air CO 2 concentration will probably lead to increased sensible heat flux and therefore enhanced convection at larger spatial scales.

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Cover Community Ecology
Community Ecology An Interdisciplinary Journal Reporting Progress in Community and Population Studies
Print ISSN:
1585-8553
Online ISSN:
1588-2756

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Community Ecology
Language English
Size A4
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Foundation		 2000
Volumes
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Springer Nature Switzerland AG
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ISSN 1585-8553 (Print)
ISSN 1588-2756 (Online)

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