Abstract
This study aims to construct definitive sites curves for native bracatinga stands (Mimosa scabrella Benth) in the metropolitan region of Curitiba. Data used was extracted from 648 pairs of values of dominant height and age. Ten mathematical models were tested for guide curve fitting. Selection of the best performing model was based on adjusted coefficient of determination(Raj²), standard error of estimate in percentage (Syx%) and graphic analysis of residuals. Models were tested and the Chapman-Richards model was selected for construction of limit curves of site classes due to the biological significance of its coefficients, statistical performance and good distribution of residuals. Curve anamorphism and model validity were verified using the test proposed by Kirby (1975). Curve stability was demonstrated based on stem analysis data composing part of the database. Site classification for bracatinga stands was thus considered suitable and can potentially be applied to development of growth and yield equations for this particular species.
Highlights
Bracatinga (Mimosa scabrella Benth) is a heliophyle species, pioneer in secondary vegetation of Mixed Ombrophilous Forest
The database proved effective in developing site curves for bracatinga plantations in the metropolitan region of Curitiba, being representative at different ages
Despite showing lower results for the statistical analysis (Raj2 and Syx%) than some of the models tested, the biological model of Chapman-Richards proved effective in describing dominant height growth for bracatinga stands, with the free fitting equation being selected for construction of site curves
Summary
Bracatinga (Mimosa scabrella Benth) is a heliophyle species, pioneer in secondary vegetation of Mixed Ombrophilous Forest. Bracatinga is the most important native forest species of the metropolitan region of Curitiba while being distributed across an area of around 66,768 ha (MAZZA et al, 2000). It is predominantly cultivated in small farmed properties up to 50 ha in area, in most of which it plays the part of a ‘green savings account’ for the reason that producers expect to derive a reliable income with hardly any labor requirements (CARPANEZZI et al, 1988). Among the methods used for constructing site index curves, the guide curve method is one that has been widely used, for instance, in the work of Cruz et al (2008), Martins et al (2007), Scolforo and Machado (1988) and Selle et al (1994)
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