Álisson Sobrinho Maranho

Crescimento inicial de espécies nativas com potencial madeireiro na Amazônia, Brasil

RESUMO – O estudo de producao de mudas florestais com potencial madeireiro adquire grande importância diante da necessidade de reposicao dessas especies devido a forte exploracao comercial, recomposicao de vegetacao em areas degradadas e utilizacao ornamental. O objetivo deste trabalho foi avaliar o crescimento inicial de mudas de tres especies florestais nativas, mulateiro (Calycophyllum spruceanum Benth.), amarelao (Aspidosperma parvifolium A.DC.) e freijo [Cordia alliodora (Ruiz & Pav.) Cham.] em diferentes substratos a base de residuos agroflorestais. Os substratos testados foram Terra – Testemunha (T), Residuo de Acai Peneirado (RAP), (T)+(RAP) (1:1 v/v) e Casca de Amendoim Triturada (CAT) + Casca de Castanha Triturada (CCT) + Terra (T) (1:1:1 v/v/v) em delineamento inteiramente casualizado no arranjo fatorial 3x4 (tres especies x quatro substratos) resultando em 12 tratamentos, com cinco repeticoes de duas plântulas, totalizando em 120 unidades amostrais, sendo o crescimento das mudas observado por um periodo de 120 dias. Os parâmetros utilizados para avaliacao do crescimento foram altura da parte aerea, diâmetro do colo, massa seca da parte aerea, das raizes e total. Dentre os substratos estudados, a composicao CAT+CCT+T mostrou-se adequado para o cultivo do amarelao, freijo e mulateiro, no entanto, as mudas do ultimo desenvolveram-se melhor no substrato terra.

Transposição de plântulas de Alchornea castaneifolia (Willd.) A. Juss. Da regeneração natural como estratégia de produção de mudas em viveiro

Alchornea castaneifolia (Willd.) A. Juss. (Urana) is a native species with potential for restoration of riparian vegetation and urban forestry. Given the difficulty of its propagation and the lack of knowledge about their behavior in nursery, this study aimed to evaluate the transposition of Alchornea castaneifolia from natural regeneration as a strategy for saplings production in nursery. The collecting took place in Porto Acre - AC, and selected 120 seedlings, which were divided into three height classes ( 15 cm) and cultivated in four substrates (soil, sand, wasting acai+soil, Plantmax) in a completely randomized design in a 3x4 factorial design. We investigated the survival of seedlings and the growth in sand substrate to the characteristics height (H) and collar diameter (DC), the relationship H/DC, dry mass of shoots, roots and total between the three height classes of the seedlings. The highest percentage of Alchornea castaneifolia seedlings survival was observed in the sand substrate (67%), followed by the wasting acai+soil substrate (43%). Seedlings that showed greater growth in height, collar diameter and dry mass production were contained in the class above 15 cm in sand substrate. However, the 10-15 cm class of height presented 100% survival of seedlings in sand substrate and also provided high growth. It is therefore recommended the transposition of seedling in the 10-15 cm class using sand substrate for the propagation of Alchornea castaneifolia in nursery.

Woody flora of natural forest gaps in a bamboo-dominated forest remnant in southwestern Amazonia

Abstract: Forest gaps, created by the falling of one or more trees, have been seen as a key factor for the maintenance of local plant diversity in tropical forests. In this study, our goal was to determine the floristic composition of woody plants colonizing natural gaps and in the understory of an open, bamboo-dominated ( Guadua weberbaueri Pilg.) forest in southwestern Amazonia, Acre, Brazil. We sampled and identified woody plants (≥1 m tall and DBH≤10 cm) in 20 forest gaps and nine adjacent understories. In total, 1656 plants were identified in 159 species, 116 genera and 45 families. A list of species was created, containing habitat, habit, functional group, threat status (Brazilian Flora Red List) and abundance data for each species.