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CHAPTER 4 META-ANALYSIS OF MODEL PARAMETERS

By Belinda Medlyn, Mark Broadmeadow, Franz Badeck, David De Pury, Reinhart Ceulemans, Paolo De Angelis, Manfred Forstreuter, Ewa Jach, Samantha Jackson, Eric Laitat, Michal Marek, Ana Rey, Joern Strassemeyer, Kaisa Laitinen, Rodolphe Liozon, Bruno Portier, Peter Roberntz, Kaiyun Wang and Paul Jarvis

Abstract

In this chapter, the effects of elevated [CO2] on model parameters are studied by applying statistical techniques known as meta-analysis to the data compiled in the ECOCRAFT database. Three processes were studied in particular: photosynthesis, stomatal conductance, and dark respiration. The meta-analysis of photosynthesis data indicated that parameters of the photosynthesis model were down-regulated in elevated [CO2]. This down-regulation was, in general, related to a reduction in leaf nitrogen content; the relationship between photosynthetic parameters and leaf nitrogen content was unchanged under elevated [CO2] in most experiments. The meta-analysis of stomatal conductance data indicated that, overall, stomatal conductance was reduced in elevated [CO2], although the effects were much stronger for deciduous species than for coniferous. Sensitivity of stomatal conductance to environmental conditions was unchanged by growth in elevated [CO2]. Parameters of the commonly used Ball-Berry model of stomatal function were also unchanged. The meta-analysis of respiration data showed no consistent effect of elevated [CO2] on respiration rates. There was a strong relationship between respiration per unit mass and tissue nitrogen content, which was unchanged by growth in elevated [CO2]. Overall, we conclude that current models of these physiological processes are adequate to describe the observed responses to elevated [CO2]

Year: 2011
OAI identifier: oai:CiteSeerX.psu:10.1.1.198.5156
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