Effects of mesophyll conductance on vegetation responses to elevated CO2 concentrations in a land surface model

Global Change Biology
Jürgen KnauerChristiane Werner

Abstract

Mesophyll conductance (gm ) is known to affect plant photosynthesis. However, gm is rarely explicitly considered in land surface models (LSMs), with the consequence that its role in ecosystem and large-scale carbon and water fluxes is poorly understood. In particular, the different magnitudes of gm across plant functional types (PFTs) are expected to cause spatially divergent vegetation responses to elevated CO2 concentrations. Here, an extensive literature compilation of gm across major vegetation types is used to parameterize an empirical model of gm in the LSM JSBACH and to adjust photosynthetic parameters based on simulated An  - Ci curves. We demonstrate that an explicit representation of gm changes the response of photosynthesis to environmental factors, which cannot be entirely compensated by adjusting photosynthetic parameters. These altered responses lead to changes in the photosynthetic sensitivity to atmospheric CO2 concentrations which depend both on the magnitude of gm and the climatic conditions, particularly temperature. We then conducted simulations under ambient and elevated (ambient + 200 μmol/mol) CO2 concentrations for contrasting ecosystems and for historical and anticipated future climate conditions (repre...Continue Reading

References

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Citations

Sep 8, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Louis Gourlez de la MotteBernard Longdoz
Oct 30, 2019·The Plant Journal : for Cell and Molecular Biology·Jürgen KnauerYing Sun
Nov 3, 2020·The New Phytologist·John R Evans
Mar 20, 2021·Journal of Experimental Botany·Raed ElferjaniMebarek Lamara

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Software Mentioned

ExpL
Exp
JSBACH
ES
GPP
MPI
HadGEM2

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