Determinação da taxa de corte sustentável para a Araucaria angustifolia (Bertol.) Kuntze em um remanescente florestal no município de Dois Vizinhos - PR

Abstract

This work aims to calculate the rate of sustainable cut for the Araucaria angustifolia in a fragment of native mixed Ombrophilous forest located in the municipality of two neighbors. The study was conducted in a fragment of approximately 8,46 hectares, being conducted by the inventory sampling in Malta cross type conglomerate, with 4 sub plots in each conglomerate. The sub plots had a size of 20 meters by 40 meters, being sampled 5 conglomerates. In each installment was held CAP measurement and identification of species of all the trees that had CAP exceeding 15 centimeters. For the Araucaria was also measured the total height and height commercial. Yet the increment data were evaluated for the araucária, being collected two specimens of the tree trunk of larger CAP of each sub-plot with the aid of the Auger to Pressler. In the fragment were identified 35 species, being the dominant species of Araucaria angustifolia, forming the canopy. To estimate the height depending on the DAP for the Araucaria, the equation which best adjusted was Backman, represented by: hi = e0,2661+1,06857ln(DAP)−0,09305∗ln2(DAP). This equation has good stats and good distribution of waste. The inventory held was found a commercial volume of wood available from 151,40 m3 per hectare, totaling a volume of 1280,92 m3 in 8,46 hectares. There was a large variance in the analysis of the data, not being recommended this process data sampling for small settlements. The Periodic Annual Increment of the diameter of the last 5 years was 0,54 cm, and the Periodic Annual Increment in Volumetric percentage was 1,44%, resulting in an intensity of 30,11% cut in a cutting cycle of 25 years. The rate cut was 385,7 m3 25-year cycle.