Curvas de índice de sítio para plantios florestais comerciais de Pinus taeda L. localizados na Região Oeste Catarinense

Abstract

This study aimed to construct site index curves for the species Pinus taeda L. in plantations owned by Celulose Irani S.A., by using mathematical modeling. I sought to determine the hypsometric relation by adjusting regression equations to determine the relation between the variables dominant height and age, test and select equations dominant height according to age, build curves site index for the entire forest stand. The data base was composed of 632 temporary plots between the ages of 7 and 14 years, where were measured the DAP of all Individuals that comprised the plots and the height of 20% of the trees, with the height of the four thicker trees together. To estimate the relation hypsometric, I used data coming from the inventory, adjusted by Stofells model and to estimated the dominant height according to age, the best result was found by Chapman-Richards model with two coefficients. From the selected model the guide curve was built and the age of 13 was the one that allowed us to create a group of 9 monomorphic cueves to the site index, the lowest site index value was 6 and the highest rate of site value 22.