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Ciência Rural

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TOLEDO, Diego de Paula; JACOVINE, Laércio Antônio Gonçalves; TORRES, Carlos Moreira Miquelino Eleto  and  SOARES, Carlos Pedro Boechat. Biomass equation and carbon stock of jatropha crop, in Viçosa, Minas Gerais, Brazil. Cienc. Rural [online]. 2012, vol.42, n.11, pp.1998-2004.  Epub Sep 11, 2012. ISSN 0103-8478.

This study had the objectives to estimate equations of biomass and carbon stock of Jatropha (Jatrophacurcas L.). The area of this study is located in Viçosa, Minas Gerais, planting carried out in 3.5x3.0m spacing at 4.64ha. To biomass quantification, we used the direct destructive method, applied to trees, which were selected according to the measurements of height, canopy diameter and number of branches. The tree biomass determination was obtained by the proportionality method. The adapted models were from Spurr and Schumacher & Hall, for biomass and total biomass (aboveground biomass more taproots biomass). The carbon stock was estimated multiplying the biomass by the carbon content of dry matter, which was obtained by calcination in a muffle. The estimate of the equivalent CO2 stored was obtained by multiplying the carbon stock by a factor 44/12. The equation with better model and who was used for carbon stock determination was to Spurr, using total biomass data, B=0.7601*(CD2*H)0.8949, where B = biomass (kg); CD = canopy diameter (m); e H = height (m). The carbon stock of culture, founded to the fourth year, was 6.79MgC ha-1, corresponding to 24.89MgCO2(eq) ha-1. The results shows that Jatropha is environmentally viable for development of CDM afforestation / reforestation projects or carbon projects to voluntary markets, adding income to farmers and improving the financial attractiveness of the crop.

Keywords : clean development mechanism; Kyoto protocol; biodiesel; Jatrophacurcas L.

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