%0 Journal Article
%A Marino, G.
%A Aqil, M.
%A Shipley, B.
%T The leaf economics spectrum and the prediction of photosynthetic light-response curves
%B Functional Ecology
%D 2010
%V 24
%P 263-272
%N 2
%X 1. In this paper we determine whether interspecific variation in entire
photosynthetic light–response curves correlates with the leaf traits
of the ‘leaf economics spectrum’ (LES) and the degree to which such
traits can predict interspecific variation in light–response curves.
This question is important because light–response curves are included
in many ecosystem models of plant productivity and gas exchange but
such models do not take into account interspecific variation in such
response curves.
2. We answer this question using original observations from 260 leaves
from 130 plants of 65 different species of herbaceous (25) and woody
(40) angiosperms. Herbs were grown in growth chambers and gas exchange
measurements were taken in the laboratory. Leaf traits and gas exchange
measurements for the woody plants were taken in the field. Leaf traits
measured were leaf mass per area (LMA), leaf nitrogen concentration
(N) and leaf chlorophyll concentration (Chl). We fitted the Mitscherlich
and Michaelis–Menten equations of the light–response curve separately
for each leaf. This gave (for the Mitscherlich equation) the light
compensation point (ϕ), the quantum yield at the light compensation
point (q(ϕ)), and maximum net photosynthesis (Amax) and (for the
Michaelis–Menten equation), the maximum gross photosynthesis (Gmax),
the half saturation coefficient (k) and the dark respiration rate
(Rd).
3. Amax and q(ϕ) were highly correlated with the measured leaf traits
but ϕ was not. All three parameters of the Michaelis–Menten equations
were correlated with the leaf traits. Allometric equations predicting
the parameters of the Mitscherlich and Michaelis–Menten equations
by N and LMA are presented. Replacing the leaf-specific parameters
by these general allometric equations based on leaf N and LMA gave
good predictions of net photosynthetic rates over the entire range
of irradiance (r = 0·79–0·98) but with a downward bias for the herbs
when the most general allometric equations are used.
4. These results further extend the generality of the LES and may
allow available information from large leaf trait data bases to be
incorporated into ecosystem models of plant growth and gas exchange.
%( 1365-2435
%K light-response curves, leaf nitrogen concentration, plant allometry,
plant gas exchange, net photosynthesis, specific leaf area, specific
leaf mass
%# Luc
%I Blackwell Publishing Ltd
%Z timestamp=(2010.10.04)
%U http://dx.doi.org/10.1111/j.1365-2435.2009.01630.x
%F MarinoAqilShipley2010
%3 BibTeX type = ARTICLE