Diversidade arbórea e estoque de biomassa em um castanhal nativo no Sul do Estado de Roraima

Abstract

Environmental services are natural processes that guarantee species survival on the planet. In addition, they may provide goods and services that satisfy human needs. This study aims to quantify the environmental services related to biodiversity and the biomass stock of a native Brazil nut grove on the south of Roraima. The study was carried out in an area of dense rainforest located in the municipality of Caracaraí. All trees (including palm trees) with diameter greater than or equal to 10cm were marked, mapped, measured, and identified in 8 plots of 1 hectare distributed in an area of 4 km² to determine the biomass stock and species composition. 243 species were identified, with Arecaceae as the most frequent family and Oenocarpus bacaba as the most abundant species. About 68.7% of species are considered rare. Nine species are considered domesticated. The average stock of living tree biomass was 380.87 mg/ha. The native Brazil nut grove presented higher species diversity The Bertholletia excelsa species contributed significantly to the total biomass stock (40%), despite the low density, unlike other domesticated species. The species also had a higher carbon stock, thus presenting a higher monetary value (US$ 691.90/ha). These data may contribute to valuations criteria and public policies development for ecosystem services payment in native Brazil nuts groves, elucidating the importance of Brazil nuts and Brazil nuts groves for biodiversity and sociodiversity conservation and carbon sequestration.