Capacidade produtiva do cumaru em sistema ILPF no Baixo Amazonas

Abstract

In order to assess the technical and economic feasibility of the Crop-Livestock-Forest (iLPF) integration systems, it is important to know the growth and production of the forestry component. The objective of this work was to select hypsometric and volumetric models of Dipteryx odorata (Aubl.) Willd., To evaluate the growth of planting in a crop-livestock-forest integration system in the municipality of Mojuí dos Campos, Pará. Dendrometric data (CAP, crown diameter and total height) and silvicultural data (stem quality, phytosanitary status and natural pruning) were collected from 240 coumaru trees in a 1ha iLPF with 9 years of implantation. Six hypsometric models and 9 volumetric models were adjusted, where 68 trees were cubed by the Smalian method. The selection of the best equation was performed observing the following criteria: adjusted determination coefficient (𝑅𝑎𝑗2), standard error of the estimate in percentage (𝑆𝑦𝑥%), Schlaegel adjustment index (I.A.), significance of the parameters by the Test ta 5% probability, normality of residues using the Kolmogorov-Smirnov test to 5% probability and graphical analysis of percentage residues. The Chi-square test was used to validate the best models. The simple linear model was the most adequate to estimate the total planting height. The best model for estimating the volume of the coumaru was the Husch model. The spacing of 5 m x 7 m, used in planting, was adequate for the development of the coumaru. However, the lack of silvicultural treatments limited the growth of trees in height and diameter.