Quantificação de carbono sequestrado em povoamentos de eucalyptus spp na floresta de Inhamacari - Manica

Abstract

n recent years, environmental issues have been very relevant in the discussions international organizations due to the serious problems faced by humanity, resulting from the global warming. In this way, measures must be taken to contain the actions that since the Industrial Revolution have been responsible for the gradual increase in global temperature. In this way, measures must be taken to contain anthropic actions that since the Industrial Revolution have been responsible for the gradual increase in global temperature. With a view to mitigating the effects of climate change, several agreements were made in international level, having its landmark in 1992 with the United Nations Framework Convention on Climate Change. The Kyoto Protocol recognizes the role of reforestation in forests in the global carbon cycle and established credit issuance mechanisms for reduction of emissions and removal of greenhouse gases, the so-called Clean Development (CDM). In this context, one can take into account the prospects for increase in natural carbon reserves by establishing new forest plantations, agro-forestry systems and for the recovery of degraded areas. However, this study was carried out in the forest of Inhamacari, administrative post of Machipanda, Manica district. Its general objective was to quantify the carbon sequestered in three stands of 6, 11 and over 30 years old of Eucalyptus spp in Inhamacari, specifically adjust mathematical models to estimate biomass; Estimate the stock of total and compartmental biomass and carbon and to compare the carbon fixation potential at different ages. For this purpose, a total of 30 trees were randomly selected, diameters were measured at breast height and total height and subsequently slaughtered and weighed. For estimation of biomass and carbon content were then established 12 plots, 4 in each age group, where diameters were measured at chest height for all trees. The results indicate that the regression model that best estimates the total biomass and carbon content is PST = 0.339 × DAP 2.141, with R 2 = 93.6% and Syx = 13.60%, for trunk it is PSTT = 0.202 × DAP 2.237, with R 2 = 0.935 and Syx = 14.34%; and for branches with leaves it is PSTR = 0.167DAP 2 - 2.418DAP + 15.41, R 2 = 0.936. The contents of biomass and carbon at different ages are: for 6 year old eucalyptus biomass is 72.55 T / ha and 36.28 T / ha of carbon; for 11 years the biomass is 177.61 T / ha and 88.80 T / ha of carbon; and for age over 30 years the biomass is 476.44 T / ha and 238.22 T / ha of carbon. Regarding the carbon content per compartment, the largest production is registered on trunks with about 81.7% of total carbon and 18.3% of the crown component (branches with leaves). Comparing, the results indicate that the greater the age, the greater the content of biomass and carbon, showing increasing values ​​from 6 years to more than 30 years. (TRADUÇÃO NOSSA)