@Article{Verryckt_etal2020,
author="Verryckt, L.T.
and Ellsworth, D.S.
and Vicca, S.
and Van Langenhove, L.
and Pe{\~n}uelas, J.
and Ciais, P.
and Posada, J.M.
and Stahl, C.
and Coste, S.
and Courtois, E.A.
and Obersteiner, M.
and Chave, J.
and Janssens, I.A.",
title="Can light-saturated photosynthesis in lowland tropical forests be estimated by one light level?",
journal="Biotropica",
year="2020",
publisher="Blackwell Publishing Ltd",
volume="52",
number="6",
pages="1183--1193",
optkeywords="canopy architecture",
optkeywords="interspecific variation",
optkeywords="light intensity",
optkeywords="lowland environment",
optkeywords="parameter estimation",
optkeywords="photon flux density",
optkeywords="photosynthesis",
optkeywords="saturation",
optkeywords="tropical forest",
optkeywords="French Guiana",
abstract="Leaf-level net photosynthesis (An) 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 An on PPFD in two tropical forests in French Guiana. We estimated the light saturation range, including the lowest PPFD level at which Asat (An at light saturation) is reached, as well as the PPFD range at which Asat 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 An. Light saturation ranges differed among canopy heights, but a PPFD level of 1,000~{\textmu}mol~m-2~s-1 was common across all heights, except for pioneer trees species that did not reach light saturation below 2,000~{\textmu}mol~m-2~s-1. A light intensity of 1,000~{\textmu}mol~m-2~s-1 sufficed for measuring Asat 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 Asat at higher PPFD levels (for upper canopy leaves up to 1,600~{\textmu}mol~m-2~s-1) are comparable with studies measuring at 1,000~{\textmu}mol~m-2~s-1. {\textcopyright} 2020 The Association for Tropical Biology and Conservation",
optnote="exported from refbase (http://php.ecofog.gf/refbase/show.php?record=948), last updated on Mon, 08 Feb 2021 15:40:46 -0300",
issn="00063606 (Issn)",
doi="10.1111/btp.12817"
}