PALAVRAS-CHAVE RESUMO:O mogno (Swietenia macrophylla King) é uma Meliaceae de alto potencial econômico, encontrada nas florestas de terra firme da Amazônia brasileira, sendo uma das espécies mais exploradas no Brasil e por isso ameaçada de extinção. O estudo objetivou avaliar o efeito da posição de semeadura e presença de endocarpo na emergência e crescimento inicial de plântulas de S. macrophylla. O delineamento foi inteiramente ao acaso, com quatro repetições de 25 sementes, disposto em esquema fatorial 3 × 2 (posições e endocarpo). Os tratamentos consistiram em diferentes posições das sementes no substrato tendo como referência o poro germinativo: 0° -poro germinativo voltado para cima -PGC; 90° -poro germinativo voltado para o lado -PGL; 180º -poro germinativo voltado para baixo -PGB. Foram avaliados: a percentagem de emergência, tempo médio de emergência, diâmetro do coleto, número de folhas, altura da parte aérea, comprimento de raiz, massa seca da parte aérea e massa seca da raiz. As posições da semente afetam o percentual e o tempo médio de emergência de plântulas de S. macrophylla. A posição 0º proporciona maiores porcentagens de emergência e menor tempo médio de emergência. Para favorecer a emergência e crescimento inicial de plântulas de S. macrophylla, a semeadura deve ser realizada com o poro de germinação da semente voltado para cima, sem a presença do endocarpo. ABSTRACT: Mahogany (Swietenia macrophylla King) is a high economic potential Meliaceae found in an upland forest of the Brazilian Amazon, one of the most exploited species in Brazil and because of that is endangered. The study aimed to evaluate the effect of sowing position and presence of endocarp in the emergence and initial growth of S. macrophylla seedlings. The design was completely randomized with four replications of 25 seeds, arranged in a factorial 3 × 2 (positions and endocarp
The objective of this work was to evaluate the litter production and decomposition in three mahogany (Swietenia macrophylla King) systems in the northeastern Pará region. The treatments were: T1-mahogany consortium with forest species; T2-homogeneous plantation of mahogany; and T3-secondary forest enriched with mahogany. Collectors of 1 m 2 opening were used to collect the litter produced monthly for a year. Evaluations were performed monthly for one year. The decomposed litter was estimated by means of the relation between the litter produced and the litter accumulated in the soil. The litter deposition dynamics did not present a significant correlation with variations in rainfall and average temperature. The homogeneous mahogany plantation produced more litter (5.6 Mg ha-1 year-1) with the leaf fraction being the most representative. The decomposition and renewal of litter did not differ between the three mahogany environments. The pure Brazilian mahogany plantation produced a larger amount of litter compared to the other planting systems, with the leaf fraction presenting the highest percentage contribution.
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