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Estimating aboveground carbon stocks in forest reforestation and forest remnants This study evaluated Atlantic Forest species restoration estimating aboveground carbon stocks across different sites and age-classes and compared them with local remnants forest areas. The restoration sites and native forests were located in the Tiete river basin, in a semi deciduous forest type on the shores of the Tres Irmaos CESP Dam, which comprehends the municipalities of Andradina, Aracatuba, Pereira Barreto, Sud Menucci and Santo Antonio do Aracangua in Sao Paulo State. The restoration stands ranged from 4 to 20 year-old and the total reforested are was 2,860 ha. The aboveground carbon stocks of the restored forest were calculated for 75 plots (24 m x 18 m) in plantation areas and 9 plots in the residual forests. All trees with diameter at breast height DBH> 3 cm were measured. We calculated the basal area, DBH, density of trees per hectare, diversity and frequency of forest species and average carbon stock per hectare, and performed qualitative analysis of plots. The confidence interval of the carbon estimates was calculated (10% error, 90% probability). The reforestation present high variability of survival and C stocks due to aspects of site quality and maintenance operations. On the annual increment of the restoration ranged from 0.72 to 1.76 Mg C ha yr , and with an estimated value of about 1.07 Mg C ha yr for the age of 20 years. The residual native forests also show large C stock variation due to disturbances averaging 35.45 Mg C ha. Considering the maintenance of growth rates at age 20 years it would take another 15 years to reach the average stock of the riparian forests. Younger stands also show higher survival and higher growth rates than older plantings which is probably related to the best silvicultural practices of soil preparation, controlling of invasive grasses and fertilization. A total of 84 forest tree species were identified and 19 of them account for 85% of the individuals and 82% of carbon stocks, been predominantly pioneers. Plantings can be classified as young plantings, with a predominance of pioneer species and in early stages of succession.

Estimativa dos estoques de carbono na parte aérea de reflorestamentos de espécies nativas e remanescentes florestais