Incremento de Cordia trichotoma (Vell.) Arráb. ex Steud. no município de Salto do Lontra - Paraná

Abstract

The louro-pardo ( Cordia trichotoma ( Vellozo ) Arrabida ex Steud ), is a native species that has accelerated growth and wood of excellent quality, and to establish a forest management suitable for this species is important to study its characteristics dendrometric and increment the various levels of competition. This present study aimed to evaluate the dendrometry and periodic annual increment in basal area of C. trichotoma the municipality of Salto do Lontra - PR . To survey data were evaluated 26 trees louro-pardo free competition in grazing area and 9 under different levels of competition in permanent preservation areas (APP), at a private estate in the city of Salto do Lontra . Were measured for each tree diameter at breast height (dap) , total height (h) , time to early canopy (hic) , commercial height (hc) , crown length (cc) and crown diameter (dc) was also rated the level of competition that the trees were submitted . To determine the annual increment louro-pardo were collected with the help of two cylinders Pressler auger wood bole of each tree at a height of 1.3 m above the ground, these baguetas channels were fixed in wood and then sanded after with the aid image - Pro Plus software were measured the last five rings of each sample, ie , the growth of the years 2008 to 2012 . For data analysis we used the software Microsoft Excel and Statical Analysis System (SAS), version 9.2 . Where established simple linear correlations between variables dendrometric and periodic annual diameter increment and basal area, with a significance level of 1 % and 5 % probability of error. To elaborate the model annual periodic increment in basal area were conducted multiple regression analyzes using PROC STEPWISE method. To select the best regression model, we analyzed the fit of each equation comparatively observing the coefficient variation (CV%), adjusted coefficient of determination (R2aj) , the value of F calculated and the best distribution of residuals in the chart plot . The results obtained in this study showed that trees louro-pardo free competition have a larger diameter at breast height , crown diameter , crown length and annual periodic increment , but matched against the values of total height , height commercial and early canopy height are lower when compared to trees under competition. The model estimated the annual periodic increment of basal area (IPAg) , was distinguished for the trees louro-pardo under competition and free, but the variable diameter at breast height was able to explain the IPAg for both traits , obtaining it is thus for the trees under competition the following model IPAg ln = 4.08149 + (- 406.82345) * 1/dap ² , and the trees free √IPAg = -9.3218 + 4.7621 * ln dbh , which showed the lowest CV% , higher R² and aj best residual distribution of the graph.