Curvas de índice de sítio para leucena [Leucaena leucocephala (Lam.) De Wit] no agreste de Pernambuco
2007
Emanuell Florencio Passos Martins | José Antonio Aleixo da Silva | Rinaldo Luiz Caraciolo Ferreira | Tadeu Jankovski | Cícero Carlos Ramos de Brito
The main goal of this work was to set and compare site index curves for leucena [Leucaena leucocephala (Lam.) de Wit] variety Hawaii (cv K8) in Agreste of Pernambuco. The data set came from Empresa Pernambucana de Pesquisa Agropecuária (IPA), Experimental Station of Caruaru, in which 544 trees cultivated with and without organic compound were measured 19 times during the period of 1990 2003. The models of Schumacher, Chapman-Richards, Silva-Bailey, Mitscherlich, Weibull and Clutter-Jones were tested and compared. To select the best equations, the Index of Fit (IF), standard error of estimate (S yx %), identity model test and the graphic of residuals distribution were used and results show that the model of Clutter-Jones provided a better IF for both treatments. The graphic of residual distribution did not show tendency among the models. The model identity test showed no differences among the models tested. As Schumacher is model has been used frequently in forestry and presented the smallest number of parameters, it deserves special focus in studies of site index.
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