Avaliação da aplicabilidade do método de amostragem por linhas interceptadoras na quantificação de resíduos de exploração florestal nas condições de uma floresta de terra firme na Amazônia brasileira.

Abstract

Evaluates the applicability of intersect line sampling method in the Eastern Amazon to estimate the volume of log wasting with accuracy in an area under Sustainable Forest Management System using Reduced Impact Logging Techniques. The study was made in Rio Capim Farm, located in Paragominas town. Pará state northeast 2º 25’e 4º 09’ e 46º 25’ e 48º 54’W Gr), Oriental Amazon. The Field survey was executed in approximated 100 ha area, corresponding to one work unit (UT n0 18) of the annual production unit (UPA n0 10) of Cikel Brasil Verde Madeiras LTDA company. It was allocated 38 intersect lines by crossing all the UT, 19 lines in the North-South way and 19 lines in the east-west way. So, in this grade was done simulations with three layouts “square”, “cross” and “L”) and arrangements with 5 and 9 sample units of 100, 150, 200 side meters to the layouts “square” and “L” and with 100 and 200 meters to the “cross” layout, all them systematically distributed in the area. Then, it was calculated the log wasting volume estimates in m3 /ha, and then proceeded the statistical analysis. With the results, it was possible to conclude that the “square” shape layout, arranged with 5 sample units, 150 meters each side and with 9 sample unit of 200 meters each side, obtained satisfactory results with standard error average of 10.09% and 9.38% respectively. But the “L” layout with 5 sample units and 150 meters each side brought still more expressive and relevant results, with the average standard error of 6,67%, the trust interval between 54,62 m3/ha and 71,89 m3/ha and the average estimative (63,3m3/ha) near close to the other studies results, using conventional sample methods. Then, it is possible to affirm that Line Intersect is a viable alternative to quantification of forest logging waste in areas under management system, looking for low prices and the easiness to its application.