Avaliação do crescimento de três espécies florestais em sistema de integração lavoura pecuária e floresta

Abstract

The goal of this paper was to evaluate the initial growth of the forest species: andiroba (Carapa guianensis - 34 Aubl.), Cumarú (Dipteryx odorata - Aubl.) and mogno africano (Khaya ivorensis - A Chev. ) and mixed (M) in 35 the city of Belterra. Growth was watched from December 2016 to December 2017 to determine collet diameter 36 (D), and height (H), for chlorophyll and leaf area two collections were made in two seasonal periods. The 37 experimental design was the completely randomized with 2 treatments, 15 repetitions of mixed planting and 35 38 pure planting. Andiroba presented the highest increase in pure planting from the fifteenth to the eighteenth 39 month of age. As for D for African mahogany there was no significant difference in any of the months between 40 the means of pure planting and mixed planting (p <0.05), however, for cumarú there was a huge difference from 41 the first month (p <0) , 05) thus continuing until the age of 21 months. The height of the andiroba was greater in 42 te pure planting in the first three months, from the fourteenth month of age the increment became greater in 43 mixed planting. There was a significant difference (p <0.05) for all the African mahogany between the pure and 44 mixed plantations (p <0.05) only at 13, 15, 20 and 21 months of age. the months. The highest values for 45 chlorophyll a were obtained in the rainy season for all species in the two plantations with the exception of 46 mahogany in mixed planting. Chlorophyll b was higher in the rainy season in pure planting for Andiroba and 47 Cumaru, and in mixed planting only for Andiroba, in the dry period it was higher in pure and mixed plantation 48 for mahogany and in mixed for cumaru. The total chlorophyll was higher in the dry period in mixed planting for 49 andiroba and mahogany and in the rainy season in pure planting for the three species. For the leaf area the 50 highest averages were recorded in rainy season for all species. Andiroba showed higher diameter growth in pure 51 planting and higher height in mixed planting. The cumaru showed greater development in diameter in pure 52 planting, and greater height in mixed planting. The development in diameter of the African mahogany did not 53 differ among the plantations, but the growth was greater in mixed planting during four months.