Ecofisiologia de plantas jovens de Genipa spruceana Steyerm submetidas ao alagamento

Abstract

In the largest part the Brazilian Amazonían forest is constituted by areas no flooded. However, about 300.000 km2 they are busy for forests flooded However, govemment actíons implemented in the north area of Brazil have been incorporating more areas to the busy ones for forests naturally you flooded, they are new areas that they have been submitted to the flood, due to the construction of hydroelectric power stations in the Amazonían area, that for his/her time comes changed the landscape drasticaily, because most of the time forest area are flooded for the construction of the hydroelectric power stations. Estimates of Eletrobrás suggest that an equivalent area to 100.000 km2 would be subject the flood if the reservoir areas drifted for the area were created. Due to that, to understand the behavior ecofisiológico of the plants of the flooded ecosystems, above ali the coming of environmental impacts due to the construction of hydroelectric power stations, it can be decisive for the understanding of as the species, individually, they will answer the resulting changes of the environmental alterations. This dissertation owes as objective investigates the behavior ecofisiológico of young plants of Genipa spruceana Steyerm and the physiologic mechanisms adopted by this species when submitted to the fiooding. For that it was analyzed the survival percentage and the variables growth alométricas; to determine the tenors foliate of macro and micronutrientes; certain the acting photosyntetic and the efficiency in the use of the water and the íntrinsic efficiency of the use of the water; determined the tenors of pigments cloroplastídicos and fluorescence of the chlorophyll the. The fiooding of the soil and the total flood promoted a decrease in the growth in height and number of leaves, in the acting photosyntetic, in the chlorophyll tenors and in parameters of the fluorescence of the chlorophyll the in the plants of G. spruceana. And the fiooding partial the development starting fi"om 15 days of fiooding, being a mechanism that I allowed his/her adaptation the such condition. On the other hand the plants submitted to the total fiooding presented clorose and abscission to foliate starting fi-om 30 days of fiooding, with total loss of the leaves to the 60 days. In spite of the treatments partially and totally they have affected the growth and the concentration of nutrients foliate, ali of the individuais of these treatments survived the 90 days of fiooding. Demonstrating that it is species is adapted the fiooding conditions.