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

Bibliographische Detailangaben
Veröffentlicht in:	The New phytologist. - 1979. - 210(2016), 3 vom: 27. Mai, Seite 1130-44
1. Verfasser:	De Kauwe, Martin G (VerfasserIn)
Weitere Verfasser:	Lin, Yan-Shih, Wright, Ian J, Medlyn, Belinda E, Crous, Kristine Y, Ellsworth, David S, Maire, Vincent, Prentice, I Colin, Atkin, Owen K, Rogers, Alistair, Niinemets, Ülo, Serbin, Shawn P, Meir, Patrick, Uddling, Johan, Togashi, Henrique F, Tarvainen, Lasse, Weerasinghe, Lasantha K, Evans, Bradley J, Ishida, F Yoko, Domingues, Tomas F
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2016
Zugriff auf das übergeordnete Werk:	The New phytologist
Schlagworte:	Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 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) Carbon Dioxide 142M471B3J

Beschreibung
Zusammenfassung:	© 2015 The Authors. New Phytologist © 2015 New Phytologist Trust. 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 r(2) 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 r(2) 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
Beschreibung:	Date Completed 26.12.2016 Date Revised 30.09.2020 published: Print-Electronic ErratumIn: New Phytol. 2016 Nov;212(3):792. - PMID 27735073 Citation Status MEDLINE
ISSN:	1469-8137
DOI:	10.1111/nph.13815