Dinâmica de carbono de uma floresta primária na Resex AuatI-Paraná, Fonte Boa, Amazonas

Abstract

Carbon dynamic in a primary forest at AuatíParaná Resex, Fonte Boa Amazonas. The world’s largest continuous tropical forest is located in the Amazon region. Protecting this forest has been a great concern of the Brazilian state, that chose the creation of conservation units (UC) as its action strategy. Most of these units are currently elaborating their management plans. Among the various products that must be contemplated in the management plans, the woody and non timber producs products always appear as potential. For these products, the forest inventory is the first step for the elaboration of a sustainable forest management project. Facing the necessity to combine natural resources conservation with their usage in the UCs, it has become mandatory for the forest inventory to expand its concept to include socialenvironmental, soil, botanical and fallen trees assessments as well. This study is part of the continuous forest inventory project of the Extractive Reserve (RESEX) AuatíParaná, Fonte Boa, Amazonas State, Brazil, localizated at 02º 30’ 50,4’’ W e 66º 05’ 31,2” S that looks at monitoring the carbon dynamics of this Resex. The Forest Management Laboratory of the National Amazon Research Institute (LMF/INPA) setup, in 2004, 20 permanent plots of ¼ hectare each in the São José do Inambé community, within the Resex. In 2007 these plots were remeasured and other 24 permanent plots were installed in two other communities, Buriti and Vencedor in the same Resex. This study aimed at: to analyze the stocks and the difference of stocks of total carbon (above ground and thick roots), to evaluate the recruitment and mortality and to make a stock projection for 2010. Two distinct alometric equations of simple entry were used to estimate the fresh mass stock, one for total fresh mass and one for fresh mass above ground level. The dominant heights from both where the equation was developed and the inventoried area were the basis of a correction coefficient equal to 0.9388 that was introduced in the allometric equations applied in the Resex. Dry mass values were obtained by using a moisture content of 41,6% and carbon values by using one of 48,5%. ANOVA was applied to verify the carbon stocks between the three communities, ANOVA for repeated plots to verify the differences of carbon accumulation over times at the São José do Inambé community and ANOVA for roots carbon to project the carbon stocks of the year 2010 and to analyze the recruitment and mortality rates for the São José do Inambé community. The Markov probabilistic transition chain was used, followed by the Quiquadrado test. The ANOVA showed that there are no differences between the total carbon stocks and the above ground carbon stocks among the three communities in the Resex, with p=0,976 and p=0,991, respectively and uncertainties inferior than 10%. Concerning the carbon stock in roots, however, the ANOVA verified difference between the three communities (p=0,002) and the Tukey test (p��0,01) showed that the Buriti community presents the largest difference (p=0,003) related to the others. In relation to the differences at carbon accumulation between the years 2004 and 2007, the ANOVA verified that the forest of the São José do Inambé community did not accumulate carbon at significant levels (p= 0,731). The dry biomass and total carbon estimates were respectively 339,58 t.ha1 e 164,70 t.ha1. The recruitment and mortality rates during the period of 2004 to 2007 for the same community were respectively 4,24% and 3,48%. The chisquare ( ��2 tab 0,05) test was equal to 6,87 indicating that the analyzed data adjust to the Markov chain. These results suggest that the forests of the three studied communities are balanced in relation to the stocks of both total carbon and above ground. Also a recruitment level larger than mortality shows that this area is stocking carbon and keeps a positive balance in its dynamic. The build up reached 0,91 t C.ha1. year1.