A test of the 'one-point method' for estimating maximum carboxylation capacity from field-measured, light-saturated photosynthesis

De Kauwe, Martin G. , Yan-Shih, Lin, Wright, Ian J., Medlyn, Belinda E., Crous, Kristine Y. , Ellsworth, David S., Maire, Vincent , Prentice, I. Colin, Atkin, Owen K., Rogers, Alistair, Niinemets, Ulo, Serbin, Shawn P. , Meir, Patrick, Uddling, Johan, Togashi, Henrique F., Tarvainen, Lasse, Weerasinghe, Lasantha K., Evans, Bradley J., Ishida, F. Yoko, and Domingues, Thomas F. (2016) A test of the 'one-point method' for estimating maximum carboxylation capacity from field-measured, light-saturated photosynthesis. New Phytologist, 210 (3). pp. 1130-1144.

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Abstract

Simulations of photosynthesis by terrestrial biosphere models typically need a specification of the maximum carboxylation rate (Vcmax). Estimating this parameter using A–Ci curves (net photosynthesis, A, vs intercellular CO2 concentration, Ci) is laborious, which limits availability of Vcmax data. However, many multispecies field datasets include net photosynthetic rate at saturating irradiance and at ambient atmospheric CO2 concentration (Asat) measurements, from which Vcmax can be extracted using a 'one-point method'.

We used a global dataset of A–Ci curves (564 species from 46 field sites, covering a range of plant functional types) to test the validity of an alternative approach to estimate Vcmax from Asat via this 'one-point method'.

If leaf respiration during the day (Rday) is known exactly, Vcmax can be estimated with an r2 value of 0.98 and a root-mean-squared error (RMSE) of 8.19 μmol m−2 s−1. However, Rday typically must be estimated. Estimating Rday as 1.5% of Vcmax, we found that Vcmax could be estimated with an r2 of 0.95 and an RMSE of 17.1 μmol m−2 s−1.

The one-point method provides a robust means to expand current databases of field-measured Vcmax, giving new potential to improve vegetation models and quantify the environmental drivers of Vcmax variation.

Item ID: 42873
Item Type: Article (Refereed Research - C1)
Keywords: A-Ci curve; leaf respiration during the day (Rday); maximum carboxylation rate (Vcmax); net photosynthetic rate at saturating irradiance and at ambient atmospheric CO2 concentration (Asat)
ISSN: 1469-8137
Funders: Australian Research Council (ARC), Birmingham Institute of Forest Research, University of Birmingham, University of Western Sydney, United States Department of Energy (US-DE), Macquarie University, Terrestrial Ecosystem Research Network (TERN), National Environment Research Council (NERC), National Science Foundation (NSF), USA, Moore Foundation (MF)
Projects and Grants: ARC LP140100232, ARC DP120103600, ARC P0986823, ARC FT0991448, ARC CE140100008, US-DE contract no. DE-SC00112704, ARC FT110100457, ARC DP110105102, NERC NE/J011002/1, NSF 1146206, MF 3001
Date Deposited: 24 Jun 2016 01:09
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050102 Ecosystem Function @ 40%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060203 Ecological Physiology @ 60%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960305 Ecosystem Adaptation to Climate Change @ 60%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960899 Flora, Fauna and Biodiversity of Environments not elsewhere classified @ 40%
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