Estrutura, distribuição espacial e volumetria de Carapa guianensis Aubl. na Floresta Nacional do Tapajós

Vieira, Diego dos Santos; Gama, João Ricardo Vaconcellos; Ribeiro, Renato Bezerra da Silva; Ximenes, Lucas Cunha

doi:10.6008/ess2318-2881.2013.002.0003

Cited by 3 publications

(6 citation statements)

References 11 publications

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“…It is believed that if the same area were evaluated with a DBH ≥ 10 cm, which is used in most studies with andiroba, the mentioned imbalance would continue to occur, since the new inventoried trees would not compensate for the low number of trees.ha -1 observed in the initial classes of this study. In the Tapajós National Forest, with data from a prospecting inventory of 200 ha, 7 km away from the study area, Vieira et al (2013) verified absence of andiroba trees in diameter classes of 15 to 35 cm. The same trend was found by Coelho (2013), who carried out a 100% inventory of andiroba with DBH ≥ 20 cm in an area of 963.5 ha in the Santo Antônio community, far more than 80 km from the study area.…”

Section: Diameter Distributionmentioning

confidence: 72%

SAMPLING PROCESSES FOR Carapa guianensis AUBL. IN THE AMAZON

Vieira

Oliveira

Gama

et al. 2018

CERNE

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HIGHLIGHTSThe process of adaptive cluster sampling (ACS) is not legally viable.The processes of systematic sampling and simple random are legally viable.The use of larger parcels in the ACS overestimates the variable of interest.The higher the share in the ACS, the greater the sampling intensity. ABSTRACTThe objective of this study was to analyze the adaptive cluster sampling (ACS), simple random sampling (SRS) and systematic sampling (SS) processes to obtain the number of ha-1 trees of Carapa guianensis Aubl. in the Amazon. The data were obtained through 100% inventory and sampling simulations, considering a DBH ≥ 25 cm, a sampling intensity of 4%, a maximum error of 10% and plots of 0.09, 0.16 and 0.25 ha. The last two sizes were only used to analyze their effect on the ACS estimators. The processes were evaluated for accuracy, precision (E % ) and confi dence interval (CI), while the mean ha -1 of the processes were compared with that of the 100% inventory by the Z test. The ACS process showed no signifi cant difference between its average ha -1 trees and the 100% inventory, and it was also the most accurate and the only one whose CI was true. However, it presented a fi nal sample intensity 3.6 times greater than the simple and systematic random samplings, in addition to E % above 10%, which makes it unacceptable, legally, and economically unfeasible. The other processes had densities signifi cantly higher than the 100% inventory, with sample intensities lower than ACS and E % lower than 10%, making them legally viable. The use of larger plots in the ACS implies larger clusters and a greater tendency to underestimate the number of trees, resulting in larger sample errors and less accuracy. v.24 n.3 2018 SAMPLING PROCESSES FOR Carapa guianensis AUBL. IN THE AMAZON FOREST 170 CERNE VIEIRA et al.

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Section: Diameter Distributionmentioning

confidence: 72%

SAMPLING PROCESSES FOR Carapa guianensis AUBL. IN THE AMAZON

Vieira

Oliveira

Gama

et al. 2018

CERNE

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“…The population structure showed a decline in the number of individuals in the largest diametric classes, which has a positive asymmetric shape (Vieira et al, 2013). The anthropic activities can also be another explanatory factor for the diametric distribution, especially in the larger diameter classes.…”

Section: /9mentioning

confidence: 95%

“…Currently, the study of spatial distribution patterns of tree species is a widely used and a promising tool to understand the behavior of several species (Capretz et al, 2012;Loregian et al, 2012;Vieira et al, 2013;Abreu et al, 2014). Knowledge about patterns of spatial distribution of tree species can provide important information on the ecological processes and characteristics of the environment itself and assist in sampling processes regarding the studied species (Capretz et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution pattern of Euxylophora paraensis Huber in a natural managed forest in the Eastern Amazon

Brandão

Dionísio

Farias

et al. 2018

Agraria

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The objective of this work was to characterize the spatial distribution pattern of the Euxylophora paraensis (yellowwood), to support conservation strategies of this species population in a managed 'terra firme' forest in the state of Pará. The study area is located in Fazenda Rio Capim, which belongs to The CKBV Florestal Ltda., in the municipality of Paragominas. For analyzing the spatial distribution of trees, geostatistics was used, based on the semivariogram modeling and kriging mapping. All evaluations had better adjustment to the spherical model, presenting the highest coefficient of determination in relation to the other models tested. Euxylophora paraensis presented an aggregate distribution pattern in the study forest, with spatial dependence described by the spherical model, forming tree clusters of size from 300 to 1000 m.

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“…A estrutura de uma população também é considerada determinante para compreender os processos que regulam uma comunidade e para a conservação de espécies (Vieira et al, 2013). Entendido isto, Castro & Carvalho (2014) afirmam que as espécies que mais necessitam ser estudadas estruturalmente são aquelas mais colhidas e comercializadas, pois são as que mais têm suas populações afetadas, como no caso da maçaranduba.…”

Section: Fundamentação Teóricaunclassified

“…Considerada o maior estoque natural de diversidade vegetal do mundo, a Floresta Amazônica apresenta uma rica composição florística nas suas mais variadas tipologias florestais, além de elevado grau de endemismo (VIEIRA et al, 2013).…”

Section: Introductionunclassified

FITOSSOCIOLOGIA DA POPULAÇÃO DE Manilkara huberi (Ducke) A. Chev. EM ÁREA DE MANEJO FLORESTAL NA FLONA DO TAPAJÓS

Moreira¹,

Conceição²,

Silva³

et al. 2019

Democratização Do Conhecimento E Valorização Profissional: Caminhos Para O Desenvolvimento Tecnológico E Social

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ResumoO objetivo do presente estudo foi avaliar a fitossociologia da espécie Manilkara huberi (Ducke) A. Chev., em uma área de manejo florestal da Flona do Tapajós em Belterra -Pará. A referida espécie é uma das mais exploradas pela Cooperativa Mista da Flona do Tapajós, que é a responsável por realizar nessa área o manejo florestal comunitário, em escala empresarial, adotando-se a técnica exploratória de impacto reduzido (EIR). A maçaranduba, como é tradicionalmente conhecida é uma Sapotaceae altamente valorizada tanto no mercado nacional, quanto no internacional, devido principalmente às suas características de madeira pesada, dura e resistente, com densidade básica de 0,87 g.cm³, indicada para uso na construção civil, confecção de dormentes, estacas, pontes, cercas e moirões. Dessa forma, compreende-se a relevância de estudar o seu comportamento, para que seja possível a aplicação de manejo adequado para a espécie de forma a garantir a sua conservação na estrutura florestal. Os dados deste trabalho foram obtidos na UPA 12 da Unidade de Manejo Florestal do Anambé, que possui área total de 1.723,66 ha, subdivida em 15 UT´s irregulares de áreas variadas entre 74,33 ha e 177,61 ha, onde foi realizado o inventário 100%, considerando indivíduos com DAP ≥ 35cm. Na análise dos dados, calculou-se a abundância, dominância, volume e distribuição diamétrica da espécie. A densidade encontrada para a maçaranduba foi de 1,73 árvores/ha e volume de 10,46 m³/ha, sendo esta a espécie mais abundante na área de estudo, com 2.295 indivíduos. A M. huberi esteve presente em todas as classes diamétricas consideradas, tendo maior concentração nos intervalos de 55 -75 cm de diâmetro e apresentando distribuição espacial de forma agrupada. A espécie apresentou alta

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Estrutura, distribuição espacial e volumetria de Carapa guianensis Aubl. na Floresta Nacional do Tapajós

Cited by 3 publications

References 11 publications

SAMPLING PROCESSES FOR Carapa guianensis AUBL. IN THE AMAZON

SAMPLING PROCESSES FOR Carapa guianensis AUBL. IN THE AMAZON

Spatial distribution pattern of Euxylophora paraensis Huber in a natural managed forest in the Eastern Amazon

FITOSSOCIOLOGIA DA POPULAÇÃO DE Manilkara huberi (Ducke) A. Chev. EM ÁREA DE MANEJO FLORESTAL NA FLONA DO TAPAJÓS

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