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Authors: LIA MLADIN, OANA SICORA, COSMIN IONEL SICORA.
Due to a higher exposure of the mountain plants to UV radiation, there is a greater vulnerability of those plants regarding the climate changes. The degradation of the ozone layer causes a specific increasing of the UVB radiation reaching the Earth. The mainly effects of UVB stress in plants are: CO2 deficiency, stomata closure, diminishing of chlorophyll level, damage of PSI and PSII, sugar decline. We have studied 3 species from the mountain area: Vaccinium sp., Juniperus sp. and Carex sp. with a MONI PAM fluorimeter. The technique of Pulse Amplitude Modulation (PAM) offers, besides images of chlorophyll fluorescence, images of all relevant photosynthetic parameters: chlorophyll fluorescence, photosynthetic photons flux density (PPFD), PSII efficiency (YII), photosynthetic active radiation (PAR), electron transport rate (ETR) and others. In this way can be detected the photosynthetic activity and its spatio-temporal variations.
