Aspectos ecofisiológicos de espécies arbustivo-arbóreas em condições contrastantes de luminosidade

Abstract

Studies show physiological differences in plants grown in different environments, as regards the availability of light. This study aimed to evaluate the effect of different light environments (full sun and understory) in germination, growth, gas exchange, chlorophyll fluorescence and cloroplastídicos pigment content of Cedrela odorata, Gallesia integrifolia, Hymenaea stigonocarpa and Schinus terebinthifolius. Study on the external area of the Experimental Farm of the Center for agricultural sciences, biological and environmental UFRB, was conducted in two distinct environments, full sun and understory. Have been assessed, in the phase of germination, emergence and early growth of the species, for 34 days. After this period the transplanting to pots containing three liters of soil, to 117 days, were performed the evaluations of gas exchange, chlorophyll fluorescence and cloroplastídicos pigments contents. The results showed interference irradiance levels in the physiological parameters, indicating phenotypic plasticity to the species studied. H. stigonocarpa and S. terebinthifolius stood out, showing the ability to develop in dynamic environments and disturbed, so it is suggested the use of these two species in the early stages of programs of recovery of degraded areas, and C. odorata and G. integrifolia in later stages, due to tolerance to shading.