Resposta de três espécies nativas de mata atlântica a diferentes condições de luminosidade

Abstract

The objective of this work was to analyze the answer of seedlings of Dalbergia nigra (Jacarandá da Bahia), Caesalpinia peltophoroides (Sibipiruna) and Plathymenia reticulata (Vinhático). Under different solar radiation intensities. The Plants were cultivated in “nurseries” under 20%, 40%, 60%, 80% and 90% of shadow and at direct sun (0% of shadow). The parameters of growth analyzed were height, diameter of the trunk, crown projection area, foliar area, individual foliar area, roots volum and total dry mass. We carried out a measurement in 20 of january of 2010 and the experiment had a totally casualized delineament in a factorial scheme of 6x3x4. To Caesalpinia peltophoroides the growth parameters analyzed were higher in the shadow intensities of 20 , 40 and 60% of shadow, with the best in 20 and 40%, showing in this study the ecological behavior of a initial secondary species. To Dalbergia. nigra the analyzed parameters were higher at the intermediate levels of shadow (40%, 60% and 80% of shadow). Nonetheless, as the growth of this species was severely affected in treatments using high light intensities, D. nigra act as a late secondary species. To Plathymenia reticulata seedlings, the best results were observed also under intermediate shadow levels (20%, 40% and 60%), but the best in 20% and acting ecologically as a initial secondary species. According to this, the species can be arranged according to an increasing order of shadow tolerance as follow: Dalbergia nigra > Caesalpinia peltophoroides > Plathymenia reticulata