Identificação de buritizais através do sensor orbital ALOS PALSAR e estimativa de estoque do recurso

This study used the ALOS PALSAR sensor (bands L-HH and L-HV) to estimate the area of Mauritia palm stands within the savanna environment of the Araça Indigenous Area, in Roraima. A fuzzy classifier was trained with four land-cover classes observed in a high spatial resolution QuickBird image that covered parts of the PALSAR scene outside the Indigenous Area. For each pixel in the entire PALSAR scene, the classifier provided a probability for each cover type, expressed as four grey-scale images. Based on independent validation sites in the QuickBird image, all pixels with >80% probability for the class Mauritia were taken to be stands of pure Mauritia palm, giving a total area of 144 hectares within the Indigenous Area. Based on previous studies of Mauritia fruit production, we estimated 189 trees ha-1 and 7,4 ton ha-1 y-1, giving a total potential production from pure Mauritia stands in the Araçá indigenous lands of 1066 ton y-1. Utilizing merchant study analyses in the states of Roraima and Pará, we estimated that revenue of wine (juice) and Mauritia oil production for the entire Araçá indigenous lands could be 266.400 liters of wine per year, which could be worth an estimated R$302.400. This same production could produce 47.520 liters of oil. This income potential could help preserve the Mauritia palm swamps in the indigenous communities of the savanna region.Pages: 8336-834