%0 Research article
%T Individual biomass and carbon equations for Mimosa scabrella Benth. (bracatinga) in southern Brazil
%A de Mello, Anabel Aparecida
%A Nutto, Leif
%A Weber, Karla Simone
%A Sanquetta, Carlos Eduardo
%A Monteiro de Matos, Jorge Luis
%A Becker, Gero
%D 2012
%J Silva Fennica
%V 46
%N 3
%R doi:10.14214/sf.44
%U https://silvafennica.fi/article/44
%X Mimosa scabrella Benth. is an important native species of southern  Brazil widely used for energy and promising for reforestation carbon  offsets. Quantification of biomass and carbon stock is valuable for both  purposes. From a forest inventory conducted in southern Brazil, data of  M. scabrella were analyzed. Thirty sample trees were felled, excavated  and weighed in the field and brought to laboratory for biomass and  carbon determination. The total aboveground biomass represented 85% of  the tree biomass, while roots corresponded to 15%. Correlation matrix of  diameter at 1.3 m height (D), tree height (H) versus total and  compartment biomass (P) indicated strong association between tree  dimensions and biomasses. Five regression models were tested and  equations were fitted to data of five biomass compartments and total  tree biomass. The best fitting model for total biomass was P = –0.49361 +  0.034865 x D<sup>2</sup>H whereas for the partial biomass of the compartments was lnP = β<sub>0</sub> + β<sub>1</sub> x ln(D) + β<sub>2</sub> lnH. Carbon concentration was statistically significantly different in  foliage than in other compartments. Three approaches of calculating  carbon stocks were evaluated and compared to actual data: 1) Estimated  total biomass x weighted mean carbon concentration; 2) Estimated partial  (compartment) biomass x compartment average carbon concentration; and  3) Carbon regression equations. No statistical difference was detected  among them. It was concluded that biomass equations fitted in this study  were accurate and useful for fuelwood and carbon estimations.