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Eficiencia de diversos tamanhos e formas de unidades de amostras aplicadas em inventário florestal na regiao do baixo Tapajós

by Silva, J.N.M; Universidad Federal do Paraná, Curitiba, PA (Brasil).
Publisher: Curitiba, PA (Brasil) 1980Description: 83 p.Subject(s): CARACTERISTICAS DEL SITIO | INVENTARIOS FORESTALES | MUESTREO | VOLUMEN | DENSIDAD DE LA POBLACION | TIEMPO | MEDICION | BOSQUE NATURAL | SITE FACTORS | FOREST INVENTORIES | SAMPLING | VOLUME | POPULATION DENSITY | TIME | MEASUREMENT | FACTEUR LIE AU SITE | INVENTAIRE FORESTIER | ECHANTILLONNAGE | VOLUME | DENSITE DE POPULATION | TEMPS | MESURESummary: The main objetive of the present research was to study the efficience of several sizes and shapes of sampling units used in forest inventories of the humid tropical forest in the Amazon Region. The whole population of trees with diameter at breast height (dbh) equal to 15 centimeters and up, was measured and ploted on a map. An investigation about time spent to measure and locate all sizes and shapes of sampling units was carried out to make possible the estimation of the relative efficience. Two populations were defined within this 35 hectares: population A - formed by all trees with dbh ranging from 15,0 - 44,9 cm; population B - trees with dbh equal to 45,0 cm and up. The tested forms were circular, square and two retangular with the smaller side equal to 10 m and 20 m. The sizes of the sampling units ranged from 400 to 1000 m{ostrok} for the population A, and from 100 to 2500 m{ostrok} for the population B. One hundred forty two common names of forest species were identifyed during the forest inventory. The average volume per hectare was 58,23 m3 for population A, and 105,40 m3 for population B. For evaluating the precision of the estimates of the combinations size-shape of sampling units, 57 sampling simulations were performed. A program writen in Basic Language was used to process them in the Hewlett Packard, model 9830 computer. The completely random system was used in the sampling process. The choice of the best size and shape combinations was made on the basis of the relative efficience. Basing on the results the author pointed out the following conclusions: a) The square samples needed a lower time to stabilish and measure, when compared with rectangular and circular shapes of same sizes, for both populations. b) For the conditions of the studied region the square samples of 900 m{ostrok} for Population A and 2500 m{ostrok} for Population B, were more efficient than the other tested sizes and shapes.
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The main objetive of the present research was to study the efficience of several sizes and shapes of sampling units used in forest inventories of the humid tropical forest in the Amazon Region. The whole population of trees with diameter at breast height (dbh) equal to 15 centimeters and up, was measured and ploted on a map. An investigation about time spent to measure and locate all sizes and shapes of sampling units was carried out to make possible the estimation of the relative efficience. Two populations were defined within this 35 hectares: population A - formed by all trees with dbh ranging from 15,0 - 44,9 cm; population B - trees with dbh equal to 45,0 cm and up. The tested forms were circular, square and two retangular with the smaller side equal to 10 m and 20 m. The sizes of the sampling units ranged from 400 to 1000 m{ostrok} for the population A, and from 100 to 2500 m{ostrok} for the population B. One hundred forty two common names of forest species were identifyed during the forest inventory. The average volume per hectare was 58,23 m3 for population A, and 105,40 m3 for population B. For evaluating the precision of the estimates of the combinations size-shape of sampling units, 57 sampling simulations were performed. A program writen in Basic Language was used to process them in the Hewlett Packard, model 9830 computer. The completely random system was used in the sampling process. The choice of the best size and shape combinations was made on the basis of the relative efficience. Basing on the results the author pointed out the following conclusions: a) The square samples needed a lower time to stabilish and measure, when compared with rectangular and circular shapes of same sizes, for both populations. b) For the conditions of the studied region the square samples of 900 m{ostrok} for Population A and 2500 m{ostrok} for Population B, were more efficient than the other tested sizes and shapes.

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