Spatial distribution of photosynthetic response to long-term influence of elevated CO(2) in a mediterranean macchia mini-ecosystem

Plant Science : an International Journal of Experimental Plant Biology
M V. MarekG Scarascia-Mugnozza

Abstract

During an open-top chamber experiment performed in evergreen 'macchia' ecosystem, which was represented by the clumps of natural vegetation dominated by Quercus ilex trees, the trees were exposed to one of two CO(2) concentrations (ambient CO(2), AC-variant and elevated CO(2), i.e. ambient plus 350 &mgr;mol CO(2) mol(-1), EC-variant) continuously over 5 years. Clumps of natural vegetation were enclosed in open top chambers (OTCs). Within the crowns of investigated Quercus ilex trees in OTCs, two crown layers i.e. sunny (E-leaves) and shaded (S-leaves), were identified as differing in solar radiation environment. To evaluate the effect of elevated CO(2), as well as the functional differentiation in assimilation activity of E- versus S-leaves, gas exchange and chlorophyll ā fluorescence techniques were used. The stimulatory effect of the long-term elevated CO(2) on the A(N)-PPFD relation was evident in E- and S-leaves of investigated Quercus trees. The A(Nmax) sensitivity of AC-variant leaves to the sudden application of elevated CO(2) was higher for S-leaves (42%) than for E-leaves (24%). The PPFD saturated rate of regulated thermal energy dissipation (ERD) confirmed the foliage differentiation caused by the long-term infl...Continue Reading

References

Dec 1, 1986·Tree Physiology·Kevin Brown, K. O. Higginbotham

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