Modelagem da biomassa total e da lenha por unidade de área para bracatingais nativos

摘要

Mimosa scabrella Benth. is a rapid-growth native pioneer specie from the Ombrophylous Mix Forest biome. It is cultivated predominantly in pure stand form or intercropped with agricultural crops by small and medium producers in the metropolitan region of Curitiba. The objective this study was to select estimative models for total and firewood biomass of M. scabrella stands per unit of area at different ages. It was data were collected from 272 temporary samples plots aged 3 to 18 years old. We tested 21 traditional models: 10 arithmetic and semi-logarithmic and 11 logarithmic; it was also developed equations by the Stepwise process from a correlation matrix. The adjusted equation were compared basing on R2aj, Syx%, F value and on graphic analysis of residuals. Two equations for each case were selected, being one traditional and other developed by Stepwise. The Clutter equation and arithmetic developed by Stepwise were selected for total biomass. For firewood, were selected the combined variable equation proposed by Spurr, and the arithmetic equation developed by Stepwise. The validation of equations was performed by Chi-square test from 17 plots randomly selected from the data base, in which four equations were considered valid to estimate total and firewood biomass for M. scabrella stands in the metropolitan region of Curitiba.