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Variation of the photosynthetic capacity across a chronosequence of maritime pine correlates with needle phosphorus concentration

Abstract : Changes in needle photosynthetic capacity has been studied across a chronosequence of four maritime pine stands aged 10-, 32-, 54- and 91-yr. We determined photosynthetic parameters from response curves of assimilation rate to air CO2 concentration (A-Ci) and radiation (A-Q) using gas exchange measurements on branches in the laboratory. Our data showed no shift in photosynthetic parameters (Vcmax, Jmax, a and Rd) with increasing stand age. This result means that the decline in productivity observed throughout our maritime pine chronosequence cannot be explained by a decrease in photosynthetic capacity but by a decline in stomatal conductance evidenced in a previous paper [7]. However, Vcmax was higher in the 32-yr-old stand compared to the other stands and theses between-stand differences were explained by leaf phosphorus concentration. Moreover, additional data of Vcmax suggest that the photosynthetic capacity may be higher at younger stages due to initial fertilisation. Therefore the P nutrition may contribute to productivity decline over the duration of the management cycle
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Sylvain Delzon, Alexandre Bosc, Lisa Cantet, Denis Loustau. Variation of the photosynthetic capacity across a chronosequence of maritime pine correlates with needle phosphorus concentration. Annals of Forest Science, Springer Nature (since 2011)/EDP Science (until 2010), 2005, 62 (6), pp.537-543. ⟨10.1051/forest:2005046⟩. ⟨hal-02682966⟩

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