Carbon stock in aboveground forest biomass in commercial Eucalyptus spp. plantation

The aim of this study was to quantify the aboveground carbon stock in different compartments of the plant, and to adjust models for the aboveground carbon stock estimation in biomass total (C-total) commercial logs (C-leco) and harvest residuals (C-rsd) in Eucalyptus spp. plantations. The study was conducted in a forest plantation in the Paraiba Valley, State of Sao, with ages ranging from 2.3 to 8 years. Biometric field measurements were taken from conventional forest inventory plots where some trees were also cut to produce the sample disks from which the carbon content was precisely determined according to standardized laboratorial procedures. The models for estimating carbon were developed based on logarithm of the diameter at breast height (DBH) and total height of individual trees (H-1). According to the results, the mean of the aboveground carbon stock total for a eucalyptus tree was 38.98 kg.tree(-1), in which commercial logs and harvest residuals were responsible for 68.9% (27.11 kg.tree(-1)) and 31.1% (12.33 kg.tree(-1)), respectively. The adjusted and tested models were precise, with coefficients adjusted determination (R-2 ajd) of the order of 97.0%, correlation coefficient Pearson (r) and the Root-Mean-Square Error (RMSE%) for the observed and estimated values ??of around 0.97 to 0.98 and from 11.04 to 12.38%, respectively. We conclude that there is a good potential to monitor growth and carbon sequestration in Eucalyptus spp. plantations using the models adjusted in this paper.