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SITE INDEX MODEL FOR NATURAL STANDS OF REBOLLO OAK (Quercus pyrenaica Willd.) IN GALICIA, NW IBERIAN PENINSULA

MODELO DE ÍNDICE DE SITIO EM POVOAMENTOS NATURAIS DE CARVALHO NEGRO (Quercus pyrenaica Willd.) DA GALICIA, NW DA PENÍNSULA IBÉRICA

ABSTRACT

Data from stem analysis of 56 dominant trees of Quercus pyrenaica Willd., in natural stands in Galicia (NW Iberian Peninsula), were used to evaluate four dynamic site equations derived with the Generalized Algebraic Difference Approach (GADA). All the equations are base-age invariant and directly estimate height and site index from any height and age. The fittings were made using a data structure involving all possible growth intervals. The GADA formulation derived on the basis of the Bertalanffy-Richards model by considering the asymptote and the initial pattern parameters as related to site productivity. It is therefore recommended for height growth prediction and site classification for natural stands of rebollo oak in Galicia. The autocorrelation was analyzed with a test of residuals using Durbin’s t-test without reaching a manifest result of autocorrelation between managed data.

Keywords:
Quercus pyrenaica; site index model; height growth; Generalized Algebraic Difference Approach

RESUMO

Dados da análise de tronco de 56 árvores dominantes de Quercus pyrenaica Willd. de florestas naturais da Galicia (NW Península Ibérica) foram utilizados para avaliar quatro equações dinamicas de índice de sitio obtidas com a Abordagem Generalizada de Diferença Algébrica (GADA). Todas as equações são baseadas na idade invariante e diretamente estimam a altura e o índice de sitio. Os ajustes foram feitos utilizando uma estrutura de dados que incluiam todos os possíveis intervalos de crescimento. A formulação GADA teve base no modelo Bertalanffy-Richards, considerando a assíntota e do padrão inicial como parâmetros relacionados à produtividade do sitio. Assim, recomenda-se o modelo na previsão do crescimento em altura e classificação de sitios para povoamentos naturais de carvalho negro na Galicia. A autocorrelação foi analisada com um teste de resíduos utilizando Durbin’s t-teste, sem chegar a um resultado significativo de autocorrelação entre os dados.

Palavras-chave:
Quercus pyrenaica; modelo de índice de sitio; crescimento em altura; Abordagem das Diferenças Algébricas Generalizadas

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Publication Dates

  • Publication in this collection
    Jan-Mar 2010
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