AbstractmLight partition has been examined and evaluated on five woody species (Olea europaea, Ficus carica, Pittosporum tobira, Hedera helix maculata, Persica vulgaris) in relation to their leaf morpho-histological characteristics, water and chlorophyll contents. Leaf parameters and optical properties (reflectance, transmittance, absorbance) in PAR, FR and NIR wavebands (400±1100 nm) were preliminarily submitted to a canonical correlation analysis where lamina thickness and water content showed a leading role in determining all the optical properties, while chlorophyll, influential in the PAR region, was remarkably effective only in an extreme pigment situation when green and albino patches of ivy leaves were compared. Transmittance appeared inversely related to lamina thickness in accordance with the Lambert Beer law. Significant correlations were found also between mesophyll water content and both transmittance (positive) and reflectance (negative). Olive leaves showed peculiar optical patterns because of the dense and continuous trichome layer on their abaxial surface.

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Chernobyl /Fall-out /Radioactivity in plants/ 13 7 Cs/ 134 Cs ratio AbstractThe effects of the Chernobyl pollution on forest biogeocènoses are described. Spruce, scotch pine, larch, beech, lichens and soils samples were analysed by high resolution gamma-spectrometry. In the established tree organs radioactivity was related to their structural and physiological features, as well as to their surface/dry weight ratios. In the developing organs growth dilution and translocation caused a lower radioactivity. Lichens retained remarkable amounts of radionuclides. The abnormal 13, Cs/ l34 Cs ratios in the organic soils were explained by analysing the "before Chernobyl" soils sampled in the same area.

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