Prognose da estrutura diamétrica de remanescente de floresta com Araucária utilizando a função densidade de probabilidade Weibull.

Ebling, Ângelo Augusto; Pelissari, Allan Libanio; Abrão, Simone Filipini; Bamberg, Rogério

doi:10.18227/1982-8470ragro.v8i1.1278

Cited by 8 publications

(10 citation statements)

References 6 publications

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“…Such models are known as probability density function; Weibull 3P and Gama are among the most used (NASCIMENTO et al 2012;BINOTI et al, 2014;EBLING et al, 2014;TÉO et al, 2015;SCHIKOWSKI et al, 2016;. The evaluation of the performance of such diametric distribution functions is performed mainly by the Komolgorov-Smirnov adhesion test (ORELLANA et al, 2014;MACHADO et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Behavior of the Diametric Distribution of Ecological Groups in a Mixed Ombrophilous Forest Fragment

Oliveira

Schmitz

Camaño

et al. 2018

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The Mixed Ombrophilous Forest is one of the most threatened ecosystems in Brazil. It is thus necessary to understand its dynamics of growth over time so that sustainable use and conservation management strategies be proposed. The objective of this study is to evaluate the behavior of the diametric distribution of two pioneer and non-pioneer ecological groups in a fragment of Mixed Ombrophilous Forest considering four years of evaluations: from 2002 to 2017. Exponential, Gamma, Weber and Weibull 3P density probability functions were adjusted. The diametric behavior of the forest and the ecological groups analyzed remained negative exponentially, being a characteristic of natural forests. The distributions that best adjusted were Weibull 3P for the forest as a whole and for the group of pioneers, and Weber for non-pioneers. We concluded that ecological groups have the same pattern of diametric distribution as the forest as a whole. However, different forest management strategies are necessary considering the intrinsic characteristics of each group. Keywords: Araucaria Forest, probability density functions, diameter classes. Resumo Comportamento da distribuição diamétrica de grupos ecológicos em um fragmento de Floresta OmbrófilaMista. A Floresta Ombrófila Mista é um dos ecossistemas mais ameaçados do Brasil. Assim, é necessário entendimento da sua dinâmica de crescimento ao longo do tempo para que estratégias de manejo de uso sustentável e conservação sejam propostas. O objetivo deste trabalho foi avaliar o comportamento da distribuição diamétrica de dois grupos ecológicos, pioneiras e não pioneiras, em um fragmento de Floresta Ombrófila Mista, considerando-se quatro anos de avaliações no período de 2002 a 2017. Foram ajustadas as funções de densidade de probabilidade Exponencial, Gama, Weber e Weibull 3P. O comportamento diamétrico da floresta e dos grupos ecológicos analisados manteve-se exponencial negativo, sendo uma característica própria de florestas naturais. As distribuições que melhor se ajustaram foram a Weibull 3P, para a floresta como um todo bem como para o grupo das pioneiras, e a Weber, para as não pioneiras. Conclui-se que os grupos ecológicos apresentam o mesmo padrão de distribuição diamétrica da floresta como um todo. Contudo, são necessárias diferentes estratégias de manejo florestal, considerando-se as características intrínsecas de cada grupo. Palavras-chave: Floresta com Araucária, funções de densidade de probabilidade, classes de diâmetro.

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Section: Introductionmentioning

confidence: 99%

Behavior of the Diametric Distribution of Ecological Groups in a Mixed Ombrophilous Forest Fragment

Oliveira

Schmitz

Camaño

et al. 2018

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“…It is important to emphasize, the limitations of these two methods, as the projections, depend only on the state that the forest presents during the inventory that originated the data used in the models (EBLING et al, 2014). For the transition matrix, this constant state for future projections is defined as a Markovian property (SCOLFORO et al, 1998).…”

Section: E Reais (2007 E 2010) Para Os Grupos Ecológicos De Espécies mentioning

confidence: 99%

“…The demand for information that helps in forestry activities planning is fundamental to effective sustained exploration, especially in native forests, where the models traditionally used are difficult to apply (EBLING et al, 2014). To studies facilitate and considering the diversity of existing species, it is stated that grouping species of forestry and similar ecological characteristics facilitate the proposition methodologies applicable to each group, the choice of species to be explored and the definition of the minimum cutting diameter, and cutting cycle (OLIVEIRA et al 2017;BRASIL, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…A demanda por informações que auxiliem no planejamento das atividades florestais é fundamental para a efetiva exploração sustentada, especialmente, em florestas naturais, onde os modelos tradicionalmente empregados são de difícil aplicação (EBLING et al, 2014). Para facilitar os estudos e considerando a diversidade de espécies existentes, afirma-se que agrupar as espécies de características ecológicas e silviculturais semelhantes facilita a proposição de metodologias aplicáveis a cada agrupamento, a escolha das espécies a serem exploradas e a definição do diâmetro mínimo de corte e ciclo de corte (OLIVEIRA et al 2017;BRASIL, 2009).…”

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Prognosis of the diametric distribution of tree species with the transition matrix and movement ratio methods

Quadros

Gomes

2020

AGRO@MBIENTE ON-LINE

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Research is needed to subsidize foresters to manage the forest for better use of wood. To help in the research, analyzing the diameter distribution, the species can be grouped according to their characteristics concerning the diameter growth and projected their future growth, determining if they reached the expected diameter before the cutting cycle stipulated by law. The aim of the present research was to diametric distribution predict by a size class distribution method, by ecological groups. The study was carried out in Moju, PA. Nine clearings were selected, around which 4 sample plots of 10 x 50 m were installed, starting at the border of the clearing into the forest in the north, south, east and west directions. All individuals with DBH (diameter at breast height) ≥ 5 cm were measured. The species were grouped into tolerant, intermediate and intolerant regarding the demand for solar radiation. The methods tested were Transition Matrix and Moving Ratio, using data from 1998 and 2001 and making projections for 3 year periods (2007 and 2010). The efficiency of the projections was tested using the Kolgomorov-Smirnov adhesion test. The projections performed by the methods did not present a significant difference between the actual and projected values. Based on the results it is recommended to use the Transition Matrix for the prognosis of the diametrical distribution of individuals belonging to the group of tolerant and intermediate species and it is indicated to use both methods for intolerant species.

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“…Among these studies, we can mention the studies Orellana et al (2014), Ebling et al (2014), Kuchla et al (2015), among others.…”

Section: Modelmentioning

confidence: 99%

Floristic, Phytosociology and Diametric Distribution of a Fragment of Ciliary Area in a Cerrado Area in Piauí, Brazil

Cerqueira

Lisbôa

Stepka

et al. 2016

NATIVA

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ABSTRACT:The objective was to perform a floristic and phytosociological study and adjust probability density functions to express the diameter distribution in a Cerrado area on the banks of the Uruçuí-Preto River. The study was carried out in the municipality of Baixa Grande do Ribeiro, Piauí, where 10 sample units of 20 x 20 m (400 m²) were placed. Living and dead individuals with CHC ≥ 10 cm were measured. To verify the sample adequacy, a method of the species-area curve was used and the horizontal structure was analyzed through phytosociological estimators. For the diametrical distribution, the functions of 2 and 3-parameters Weibull, type I and II Meyer, were adjusted. There were 621 individuals distributed in 31 species belonging to 19 families. The diametric distributions were presented in decreasing order, and the 3-parameter Weibull distribution was significant for all species analyzed and for those of higher importance value (IV), according to the Kolmogorov-Smirnov (K-S) test. The species Vochysia pyramidalis, Mauritia flexuosa, Alchornea discolor and Tapirira obtuse presented high density and frequency in the studied area with the highest IV. The 3-parameter Weibull distribution presented adequate adjustment for both data and may be indicated to describe the diametric distribution of the species.Keywords: riparian forest, horizontal structure, probability distributions.Florística, fitossociologia e distribuição diamétrica de fragmento de área ciliar em uma área de Cerrado no Piauí RESUMO: Objetivou-se realizar um estudo florístico e fitossociológico e ajustar funções densidade de probabilidade para expressar a distribuição diamétrica em um fragmento de Cerrado as margens do Rio Uruçuí-Preto. O estudo foi realizado no município de Baixa Grande do Ribeiro, Piauí, onde foram alocadas 10 unidades amostrais de 20 x 20 m (400 m²). Os indivíduos vivos e mortos com CAP ≥ 10 cm foram mensurados. Para verificar a suficiência amostral, utilizou-se método da curva espécie-área e a estrutura horizontal foi analisada por meio dos estimadores fitossociológicos. Para a distribuição diamétrica foram ajustadas as funções de Weibull com 2 e 3 parâmetros, Meyer tipo I e II. Foram registrados 621 indivíduos, distribuídos em 31 espécies pertencentes a 19 famílias. As distribuições diamétricas apresentaram-se de forma decrescente, sendo a distribuição de Weibull 3P significativa para todas as espécies analisadas e para aquelas de maior valor de importância (VI), segundo o teste de Kolmogorov-Smirnov (K-S). As espécies, Vochysia pyramidalis, Mauritia flexuosa, Alchornea discolor e Tapirira obtusa, apresentaram alta densidade e frequência na área estudada com os maiores valores de VI. A distribuição Weibull 3P apresentou ajuste adequado para ambos os dados e pode ser indicada para descrever a distribuição diamétrica das espécies.Palavras-chave: mata ciliar, estrutura horizontal, distribuições de probabilidade.Recebido em maio/2016; Aceito em agosto/2016.

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Prognose da estrutura diamétrica de remanescente de floresta com Araucária utilizando a função densidade de probabilidade Weibull.

Cited by 8 publications

References 6 publications

Behavior of the Diametric Distribution of Ecological Groups in a Mixed Ombrophilous Forest Fragment

Behavior of the Diametric Distribution of Ecological Groups in a Mixed Ombrophilous Forest Fragment

Prognosis of the diametric distribution of tree species with the transition matrix and movement ratio methods

Floristic, Phytosociology and Diametric Distribution of a Fragment of Ciliary Area in a Cerrado Area in Piauí, Brazil

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