Plantio de enriquecimento de dipteryx odorata (aubl.) Willd em clareiras de exploração de madeira em pequena escala no médio amazonas

• Autor(a) principal: Souza, Emerson Eduardo Oliveira de
• Data de Publicação: 2023
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade do Estado do Amazonas (UEA)
• Texto Completo: https://ri.uea.edu.br/handle/riuea/949
• topic: Silvicultura.; Manejo Florestal; Tratamento Silvicultural

Incorrect management of forests, when related to logging, causes loss of biodiversity and the formation of large degraded areas. To encourage forest regeneration, as well as add value to it, post-exploratory silvicultural treatments must be adopted, such as enrichment plantations. It is necessary to know how forest species planted in enrichment behave in clearing conditions formed after logging activities. In this context, the present study aimed to evaluate the effects of variation in gap characteristics on the initial establishment of seedlings of Dipteryx odorata (Aubl.) Willd, introduced via enrichment planting, with and without silvicultural treatment for seedling release, in forest management area. The study was carried out in two areas submitted to small-scale forest management located at km 64 of the AM–363 in the municipality of Silves, Amazonas. The gaps were characterized according to their size and canopy openness. 20 gaps were characterized. The area and shape of the gaps were determined by measuring the length of eight rays, starting from the center of the gaps, using a measuring tape. The opening of the canopy was made using a canopy gauge. The 20 clearings received the enrichment planting, but only 10 received the silvicultural release treatment. Bimonthly visits took place in the gaps, assessing the growth and survival of the seedlings over 255 days after planting. The percentage of mortality was 22% (43 seedlings) of dead individuals, out of a total of 198 seedlings of D. odorata planted. The silvicultural release treatment applied to D. odorata seedlings did not directly influence growth, height and diameter, and seedling mortality. It was found that, up to 255 days after planting, the growth of D. odorata seedlings did not show significant differences between the gaps that received the release treatment (height = 37.98 cm.year־¹ and diameter = 5.49 mm.year־¹) and those who did not receive this treatment (height = 47.61 cm.year־¹ and diameter = 5.52 mm.year־¹). The growth of D. odorata seedlings in enrichment plantations depends on the opening of the canopy of exploration gaps in a small-scale sustainable forest management area in the middle Amazon. The silvicultural release treatment did not directly influence, 255 days after planting, the growth and mortality of the seedlings; however, it accentuated the effects of canopy opening on diameter growth. Therefore, silvicultural treatments and gap characteristics can interact and positively influence seedling growth in enrichment plantations. This information is essential for consolidating enrichment plantations in small-scale forest management plans.