Fire compromises the recovery of a managed forest in Tapajós National Forest, Eastern Amazon, Brazil
DOI:
https://doi.org/10.37002/biodiversidadebrasileira.v12i2.1972Keywords:
Forest fire, floristic composition, tree recruitment, forest management, reduced impact loggingAbstract
Harvested forests are more prone to wildfire, shifts in forest species composition, and biodiversity loss. In this work changes in the horizontal structure and species composition of a managed forest in the Tapajós National Forest, Eastern Amazon, Brazil, along 31 years (1981- 2012) was evaluated. The disturbances included logging (1982), thinning of non-commercial species (1993/1994), and fire occurrence (1997). Data were obtained in 36 permanent plots of 0.25ha with 12 plots per each of the three treatments: selective logging + light thinning of non-commercial species, selective logging + intense thinning of non-commercial species and control area, being added to the treatments the occurrence or not of a forest fire. The changes in species composition and diversity between the last measurement after logging and before fire (1995) and the last measurement (2012) were compared. PERMANOVA, considering the relationship between the NMDS axes and the treatment variable (logging / control + fire occurrence / no fire) differed in species composition, among treatments before fire (1995) and 15 years after fire (2012). Research treatments did not present diversity loss; however, harvested forests under heavy thinning treatment presented more losses in the basal area and species composition modification, such as increasing of pioneer species density, mainly among small trees.
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