Abstract
ABSTRACT The objective of this study was to select allometric models to estimate total and pooled aboveground biomass of 4.5-year-old capixingui trees established in an agrisilvicultural system. Aboveground biomass distribution of capixingui was also evaluated. Single- (diameter at breast height [DBH] or crown diameter or stem diameter as the independent variable) and double-entry (DBH or crown diameter or stem diameter and total height as independent variables) models were studied. The estimated total biomass was 17.3 t.ha-1, corresponding to 86.6 kg per tree. All models showed a good fit to the data (R2ad > 0.85) for bole, branches, and total biomass. DBH-based models presented the best residual distribution. Model lnW = b0 + b1* lnDBH can be recommended for aboveground biomass estimation. Lower coefficients were obtained for leaves (R2ad > 82%). Biomass distribution followed the order: bole>branches>leaves. Bole biomass percentage decreased with increasing DBH of the trees, whereas branch biomass increased.
Highlights
The selection of technologies for production systems should consider ways to reduce the impacts on water use, soil and biota and should be directed toward the regeneration of ecosystem services which are associated with increased biodiversity (TILMAN et al, 2011; BALMFORD et al, 2012)
Few allometric equations have been developed for native Brazilian tree species (SALIS et al, 2004; BARBEIRO et al, 2009; PADILHA, 2011) and we found no model for native tree species grown in agrisilvicultural system
The objective of the present study was to select allometric equations for estimating total aboveground biomass of 4.5-year-old capixingui species established in an agrisilvicultural system, as well as to evaluate the aboveground biomass distribution in different compartments
Summary
The selection of technologies for production systems should consider ways to reduce the impacts on water use, soil and biota and should be directed toward the regeneration of ecosystem services which are associated with increased biodiversity (TILMAN et al, 2011; BALMFORD et al, 2012). In an attempt to diversify the forest base by introducing native species (RUSCHEL et al, 2003; CARPANEZZI et al, 2010), other species have been tested in these systems (NICODEMO et al, 2009; MELLOTO et al, 2009) One such species is capixingui (Croton floribundus Spreng.), a pioneer tree species found mainly in seasonal semideciduous forests in the southeastern region of Brazil and in northern Paraná. This plant has some interesting characteristic for agroforestry systems, such as simple seedling production, high survival rates, rusticity, and moderate to rapid growth. It is a melliferous species which is of high value to the beekeeping industry and its wood can be used for construction, cellulose production, for medicinal purposes (CARVALHO, 2003; GOUVEIA et al, 2007) and more recently for the production of briquettes
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