Production and decomposition of litter in different mahogany (Swietenia macrophylla King) cropping systems

Resumo

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 m2 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.