Can light‐saturated photosynthesis in lowland tropical forests be estimated by one light level?

Type Article
Date 2020-11
Language English
Author(s) Verryckt Lore T.1, Ellsworth David S.2, Vicca Sara1, Van Langenhove Leandro1, Peñuelas Josep3, 4, Ciais Philippe5, Posada Juan M.6, Stahl Clément7, Coste Sabrina8, Courtois Elodie A.9, Obersteiner Michael10, Chave Jérôme11, Janssens Ivan A.1
Affiliation(s) 1 : Department of Biology University of Antwerp Wilrijk, Belgium
2 : Hawkesbury Institute for the Environment Western Sydney University Penrith NSW ,Australia
3 : CREAF Barcelona, Spain
4 : CSIC Global Ecology CREAF‐CSIC‐UAB Barcelona, Spain
5 : Laboratoire des Sciences du Climat et de l’Environnement CEA‐CNRS‐UVSQ Gif‐sur‐Yvette ,France
6 : Biology Department Faculty of Natural Sciences Universidad del Rosario Bogotá, D.C. ,Colombia
7 : INRA UMR Ecofog AgroParisTech CNRS Cirad Université des AntillesUniversité de Guyane Kourou ,France
8 : UMR Ecofog AgroParisTech CNRS Cirad INRA Université de Guyane Université des Antilles Kourou, France
9 : Laboratoire Ecologie, évolution, interactions des systèmes amazoniens (LEEISA) CNRS IFREMER Université de Guyane Cayenne, French Guiana
10 : International Institute for Applied Systems Analysis (IIASA) Laxenburg, Austria
11 : UMR 5174 Laboratoire Evolution et Diversité Biologique CNRS Université Paul Sabatier ,Toulouse France
Source Biotropica (0006-3606) (Wiley), 2020-11 , Vol. 52 , N. 6 , P. 1183-1193
DOI 10.1111/btp.12817
Abstract

Leaf‐level net photosynthesis (A n) estimates and associated photosynthetic parameters are crucial for accurately parameterizing photosynthesis models. For tropical forests, such data are poorly available and collected at variable light conditions. To avoid over‐ or underestimation of modeled photosynthesis, it is critical to know at which photosynthetic photon flux density (PPFD) photosynthesis becomes light‐saturated. We studied the dependence of A n on PPFD in two tropical forests in French Guiana. We estimated the light saturation range, including the lowest PPFD level at which A sat (A n at light saturation) is reached, as well as the PPFD range at which A sat remained unaltered. The light saturation range was derived from photosynthetic light‐response curves, and within‐canopy and interspecific differences were studied. We observed wide light saturation ranges of A n. Light saturation ranges differed among canopy heights, but a PPFD level of 1,000 µmol m−2 s−1 was common across all heights, except for pioneer trees species that did not reach light saturation below 2,000 µmol m−2 s−1. A light intensity of 1,000 µmol m−2 s−1 sufficed for measuring A sat of climax species at our study sites, independent of the species or the canopy height. Because of the wide light saturation ranges, results from studies measuring A sat at higher PPFD levels (for upper canopy leaves up to 1,600 µmol m−2 s−1) are comparable with studies measuring at 1,000 µmol m−2 s−1.

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Verryckt Lore T., Ellsworth David S., Vicca Sara, Van Langenhove Leandro, Peñuelas Josep, Ciais Philippe, Posada Juan M., Stahl Clément, Coste Sabrina, Courtois Elodie A., Obersteiner Michael, Chave Jérôme, Janssens Ivan A. (2020). Can light‐saturated photosynthesis in lowland tropical forests be estimated by one light level? Biotropica, 52(6), 1183-1193. Publisher's official version : https://doi.org/10.1111/btp.12817 , Open Access version : https://archimer.ifremer.fr/doc/00634/74572/