Population structure and spatial distribution of Bertholletia excelsa Bonpl. In Juruena National park, Southern Amazon
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.008.0007Keywords:
Brazil-nut-tree, PNJu, DAPAbstract
After the decadence of rubber economic cycle, the Brazil-nut-tree was the principal extractivism product. The increasing destruction of the Amazon rainforest, has a negative impact on the Brazil-nut-tree ecology. Standards of especial distribution is the widely used tool to understand the ecology behavior of specie. Two areas was delimited in Juruena National Park, where one contained module of each PPBio, and them sampled all Brazil-nut-tree with DAP>10cm. The samples was classified in five class: Youngs, youngs adults, productive adults, mature adults and old adults. In the area I, 1200 ha, was sampled 143 individuals, and in area II, 500 ha, 18 trees. The density was 0,119 and 0,032 individuals ha-1 for the area I and area II respectively. 82,52% of individuals of area I was in productive adults class and 72,22% was in same class in area II. The sampled tree in area I have average age of 255 years, and in the area II of 208 years. The Morisita Index, for the area I and area II was 4,133 and 7,320 respectively. The espacialdistribuition was aggregate in the two areas. The area I have more density, higher concentration of tree in productive period and higher average age than area II.
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