Evaluation of the spatial dependence of dendrometric characteristics for an Eucalyptus plantation/Estudo da dependencia espacial das caracteristicas dendrometricas de um plantio comercial de eucalipto

• Published in: Acta scientiarum. Agronomy 2015-10, p.483
• Main Authors: Souza, Rodolfo Marcondes Silva, de Almeida, Andre Quintao, Ribeiro, Aristides, de Souza, Eduardo Soares, Leite, Fernando Palha
• Format: Article
• Language: Spanish
• ISSN: 1679-9275
• DOI: 10.4025/actasciagron.v37i4.19676

Geostatistics evaluates the spatial dependence between two or more variables in order to estimate unknown values in space. The objective of this study was to evaluate, using geostatistical techniques, the spatial variability of dendrometric characteristics for a commercial plantation of Eucalyptus grandis x Eucalyptus urophylla located in eastern Minas Gerais, Brazil (19°28' S and 42°49' W). The diameter at breast height (DBH) and commercial height (H) of 60 trees was measured in a forest inventory plot at two, five and seven years old. The volume of each tree in the plot was estimated from allometric equations and values of DBH and H. Spatial dependence of the three dendrometric variables at different ages was evaluated by fitting the experimental semivariogram. Validation of the semivariograms was performed using the jackknife test. The dendrometric variables analyzed presented normal distribution throughout the entire production cycle according to the Kolmogorov-Smirnov test. The spherical model adequately represented the spatial distribution of dendrometric characteristics for the planted forest. The dendrometric characteristics of the analyzed plantation had an average spatial dependence, making the use of geostatistical techniques for characterization of the plantation very important. Keywords: geostatistics, kriging, precision forestry. A geoestatistica avalia a dependencia espacial entre duas ou mais variaveis com a finalidade de estimar valores desconhecidos no espaco. O objetivo deste trabalho foi avaliar, a partir de tecnicas Geoestatisticas, a variabilidade espacial das caracteristicas dendrometricas de um plantio comercial de Eucalyptus grandis x urophylla localizado (19°28' S e 42°49' W) no leste de Minas Gerais. O diametro altura do peito (DAP) e a altura comercial (H) de 60 arvores foram medidos em uma parcela de inventario florestal, aos dois, cinco e sete anos de idade. A partir de equacoes alometricas e dos valores de DAP e H foi estimado o volume de cada arvore da parcela. A dependencia espacial das tres variaveis dendrometricas, nas diferentes idades, foi avaliada a partir do ajuste do semivariograma experimental. A validacao dos semivariogramas foi realizada a partir do teste Jack-Knifing. As variaveis dendrometricas analisadas apresentaram distribuicao normal durante todo ciclo de producao de acordo com o teste KolmogorovSmirnov. O modelo esferico foi adequado para representar a distribuicao espacial das caracteristicas dendrometrica