Competition Indexes to Evaluate Tree Growth in a Semi-Deciduous Seasonal Forest

Lustosa, Ilvan Medeiros; Castro, Renato Vinícius Oliveira; Gaspar, Ricardo de Oliveira; Araújo, Juliana Baldan Costa Neves; Aquino, F. de G.

doi:10.1590/2179-8087.010716

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…To assess the competition indexes, the correlation matrix between these indexes with dendrometric and stand variables was firstly elaborated (Daniels et al, 1986;Martins et al, 2011;Lustosa Junior et al, 2019;Curto et al, 2020). For the determination of the coefficient to be applied in the correlation matrix, the variables to be correlated were submitted to the Kolmogorov-Smirnov normality test (5% statistical significance).…”

Section: Methodsmentioning

confidence: 99%

“…The main competition indexes used in modelling of individual trees can be found in the studies of Canetti et al (2016), Costa et al (2018), Lustosa Junior et al (2019), and Curto et al (2020. There is no consensus about the superiority of any index since the selection depends on the species and the conditions of the stand being studied (Curto et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Competition indexes for individual Pinus taeda L. trees in non-thinned commercial stands

Miranda,

Figueiredo Filho,

Curto

et al. 2022

Agraria

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The competition process in a forest plantation originates from the dispute for resources, which are essential for growth. Several indexes were proposed to assess competition for different species, but such studies for pine trees are scarce in the country. These competition indices are essential in the forest modelling process. Thus, the aim of this study was to assess competition indexes for a non-thinned Pinus taeda L. stand. Data from permanent sampling units in the Telêmaco Borba region, Paraná, Brazil, were used, and tree ages ranged from 3.4 to 21.4 years. Eight indexes were assessed with a Spearman correlation matrix with dendrometric and stand variables. Moreover, for each site class, the average trend of competition indexes by class diameter and age was analysed. There was no single index that correlated the most with all variables. For diameter, height and probability of mortality variables, the most correlated indexes were Glover and Hool, Lorimer, and Stage, respectively. The competition indexes have satisfactorily shown the average behaviour of competition in relation to age and site classes. The selection of a single index will depend on its use, being necessary specific tests according to purpose.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Competition indexes for individual Pinus taeda L. trees in non-thinned commercial stands

Miranda,

Figueiredo Filho,

Curto

et al. 2022

Agraria

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“…Esses índices podem ainda ser agrupados em duas subcategorias de competitividade, unilateral e bilateral. A competição unilateral representa a concorrência por radiação luminosa e considera que as árvores maiores não são afetadas por aquelas vizinhas menores, enquanto a competição bilateral se refere à disputa, sobretudo, por água e nutrientes, assumindo que os recursos são disputados por todas as árvores vizinhas (SCHONS et al, 2020) Investigações científicas sobre o comportamento de índices de competição em diferentes estratos de altura são escassas e podem subsidiar o desenvolvimento de planos, manutenção e monitoramento para a recuperação de áreas degradadas e auxiliar futuras pesquisas sobre a dinâmica de crescimento em povoamentos inequiâneos (CASTRO et al, 2014;MA et al, 2017;LUSTOSA JÚNIOR et al, 2019).…”

Section: Introductionunclassified

Índices De Competição Independentes Da Distância Em Um Fragmento De Mata Atlântica

Lafetá,

Santos,

Pimenta

et al. 2023

NAT

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Investigações científicas sobre o comportamento de índices de competição em diferentes estratos de altura são escassas e podem subsidiar o desenvolvimento de planos, manutenção e monitoramento para a recuperação de áreas degradadas e contribuir para o desenvolvimento de futuras pesquisas sobre a dinâmica de crescimento em povoamentos inequiâneos. O objetivo do presente trabalho foi avaliar a influência de índices de competição independentes da distância no comportamento biométrico de árvores em diferentes estratos de altura em um fragmento de Mata Atlântica sob recuperação florestal. O estudo foi conduzido em uma área de 2,53ha, onde se realizou o inventário com intensidade amostral de 15,81%. Calcularam-se seis índices de competição para árvores contidas nos estratos inferior, médio e superior do fragmento. Os índices cujos menores valores representam maior competição sobre a árvore-objetivo exibiram correlação positiva e se associaram melhor com os atributos biométricos. O comportamento de aspectos biométricos em relação à competitividade da árvore-objetivo foi distinto entre estratos de altura. Conclui-se que, para o local de estudo, o índice de IC2 demonstrou flexibilidade para analises sobre relações entre a competitividade e aspectos biométricos em distintos estratos de altura. Aspectos os biométricos lenhosos aumentam assintoticamente com a redução da competição sobre a árvore-objetivo. Palavras-chave: altura de árvores; competitividade; comportamento sigmoidal; relação funcional. Distance-independent competition indices in an Atlantic Forest fragment ABSTRACT: Scientific investigations on the behavior of competition indices in different height strata are scarce and can subsidize the development of plans, maintenance and monitoring for the degraded area recovery and contribute to the development of future research on growth dynamics in uneven stands. This work aimed to evaluate the influence of distance-independent competition indices on the biometric behavior of trees in different height strata within an Atlantic Forest fragment under forest recovery. This study was conducted in an area of 2.53ha, where inventory was carried out with a sampling intensity of 15.81%. Six competition indices were calculated for trees contained in the lower, middle and upper strata of the fragment. Indices whose lower values represent greater competition on the target tree exhibited a positive correlation and had a better association with the biometric attributes. The behavior of biometric aspects regarding the competitiveness of the target tree was different between height strata. It is concluded that, for the study site, IC2 competition index demonstrated flexibility for analyzing relationships between competitiveness and biometric aspects in different height strata. Woody biometrics aspects increase asymptotically with reduced competition over the target tree. Keywords: tree height; competitiveness; sigmoidal behavior; functional relationship.

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“…En modelado del crecimiento de árbol individual, los índices de competencia constituyen la base de todo modelo, donde se utilizan para estimar el incremento y/o mortalidad durante una simulación (Téo et al 2015), lo que ha permitido obtener ganancias en la eficiencia del modelo (Castro et al 2014, Lustosa Junior et al 2019. Sin embargo, dado que la habilidad de un índice puede variar según la especie en estudio, la región, las condiciones del bosque, etc., no hay consenso sobre una superioridad definida de un índice sobre otro, lo que requiere evaluaciones.…”

Section: Introductionunclassified

Modelado de índices de competencia para Araucaria angustifolia en dos sitios en el sur de Brasil

et al. 2020

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This study aimed at modeling competition indices for individual trees of Araucaria angustifolia in natural forests. A total of 397 objective trees were sampled in Lages and São Francisco de Paula municipalities. Through a non-linear regression analysis, 22 distance-independent and distance-dependent competition indices were modeled based on the diameter at breast height (d) and relative height (hrel: ratio between the total height of the objective tree and the maximum potential height estimated for the same diameter). The adjusted equations of the indices according to d of the objective tree achieved values of R² ≤ 0.546 (Syx% ≥ 15.0). The independent variable hrel improved the estimates, explaining up to 63 % of the variation in the data (Syx% ≥ 14.6). In general, competition indices -which consider in the calculation only the variables d of the objective tree, d of the competitors, its horizontal distance and eventually the height variable-showed superior performance. Therefore, they are indicated for use in growth modeling of A. angustifolia, due to superior facility of application in natural forests. The developed equations showed to be good representations of the degree of competition at the level of the individual tree of A. angustifolia for the two evaluated sites, measuring only the diameter or including the height of the objective tree for more accurate precision. The expansion of research to other sites along the distribution of the species will confirm the application of these equations to their full extent. In addition, this work contributes to the inclusion of competition indices in modeling of individual trees in uneven-aged mixed forests.

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Competition Indexes to Evaluate Tree Growth in a Semi-Deciduous Seasonal Forest

Cited by 6 publications

References 19 publications

Competition indexes for individual Pinus taeda L. trees in non-thinned commercial stands

Competition indexes for individual Pinus taeda L. trees in non-thinned commercial stands

Índices De Competição Independentes Da Distância Em Um Fragmento De Mata Atlântica

Modelado de índices de competencia para Araucaria angustifolia en dos sitios en el sur de Brasil

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