Carbon content and allometric models to estimate aboveground biomass for forest areas under restoration

Maximizing carbon sequestration is crucial to mitigate climate change and indicates that the restoration technique used was effective. To quantify carbon stock over time on areas being restored, suitable allometric equations are needed. These equations are lacking for the Atlantic forest, lacking even more for restoration sites, and rare for restoration areas implemented with the active method, technique often used to restore Atlantic forest areas. Thus, the objective of this study was 3-fold. First, to provide an equation to estimate aboveground biomass for 5-year-old Atlantic forest under restoration implemented with the active method. Second, to determine carbon content for the branch, stem, and foliage pools for those areas. Third, to present biomass, carbon content, and carbon stock benchmarks for 5-year-old areas under restoration implemented with the active method. Three sites were sampled with nine plots each, measuring tree height and diameter. One subplot was established in each plot, and all trees within it were harvested and had fresh weight measured and samples were taken to the laboratory to dry weight and carbon content determination. Ten models estimating biomass were fitted and tested. Mean carbon content in foliage, branch, stem, and the weighted average were 44.8, 44.5, 45.8, and 45.3%, respectively. Mean biomass and carbon stock were 20.19 +/- 0.146 Mg/ha and 9.73 Mg C/ha. We concluded that the equation that we provide is precise, and very necessary to estimate biomass for young restoration areas at the Atlantic forest.