Crescimento e morformetria de Cumaru (Dipteryx spp.) em sistemas agroflorestais, no Oeste do Pará

Abstract

The objective of this study was to evaluate the growth dynamics through cumaru 26 (Dipteryx spp.) Morphometric relationships in three agroforestry systems in the municipalities 27 of Belterra and Mojuí dos Campos, Pará. The studied systems have different age, spacing and 28 arrangement, and in each of them (SAF1, ILPF and SAF2) 45 individuals of the cumaru forest 29 species were selected and monitored for 2 and a half years every 6 months, and dendrometric 30 variables were evaluated. morphometric. Large variation in DBH growth over time was 31 observed in the three systems, with 7-year-old ILPF cumaru with Dipteryx odorata showing the 32 highest mean diameter at breast height and total height. The SAF 2 with Dipteryx punctata at 8 33 years stood out with larger crown diameter. SAF 1 with Dipteryx odorata at 4 years presented the highest average and current annual increment rates in both DAP and HT. Regarding the 35 morphometric variables, the crown length was higher in the ILPF, while the crown projection 36 area, crown proportion, crown formality, coverage index and salience index were higher in SAF 37 2. SAF 1 has the most unstable trees. The cumaru species evaluated in the three systems 38 presented good performance in diameter and height growth, although in some periods the 39 dynamics of growth were influenced by cylmmatic factors such as precipitation, which 40 combined with age and densification also interfered in the variation of morphometric 41 dimensions. obtained in this study.