Avaliação morfométrica e dendrométrica de Pinus elliottii (Engelm) no município de Dois Vizinhos-PR

Abstract

This study aimed to investigate the behavior of dendrometric and morphometric variables of Pinus elliottii in different positions and sociological levels of competition, as well as modeling the hypsometric relation of this species and to investigate the difference in this respect between the different conditions that the trees were submitted (sociological position and competition). The work was carried out in a stand of Pinus elliottii with 2 x 2 m spacing Federal Technological University of Paraná, in the municipality of Two Neighbors - PR. In each tree were measured and their dendrometric morphometric variables. Qualitative characteristics were also evaluated as competition (COM.1: low competition; COM.2: competition average; COM3: high competition) and sociological position (PS1: sociological position 1 - dominant trees; PS2: sociological position 2 - co-dominant trees, PS3: sociological position 3 - dominated trees). Was performed using SAS test medium (Tuckey), the 5% level of probability, to check the difference of the variables dendrometric and morphometric conditions (competition and sociological position) where the pine were submitted. It was also performed a correlation analysis by Pearson CORR procedure to check the degree of relationship between variables. For the modeling of the variable total height by diameter, was used STEPWISE procedure. The parameters used for selection of the models were R2aj, Coefficient of variation (CV), F value calculated and examination of waste. It can be observed that the population under study shows great heterogeneity, as there is wide variation range between dendrometric and morphometric variables. Fact that can be linked to the settlement have not received adequate treatment and forestry management. The estimated height as a function of DAP was different for each position sociological, revealing that the trees of the upper layer, ie the dominant (PD 1) have a ratio higher than hipsometric co-dominant trees (PS 2) and the controlled or deleted (PS 3) and therefore, to set a model for each sociological position. For the competition variable, there were differences of height and diameter between low competition (COM.1) and major competitions (COM.2 and 3), and the trees that have a lower level of competition for the same diameter, had lower height than the trees that are in higher levels of competition, requiring it, the separation of these groups to describe the hypsometric relation.