Recovery of atlantic rainforest areas altered by distinct land-use histories in northeastern Brazil

Abstract

The restoration of anthropogenically disturbed sites contributes to biodiversity conservation, but pre-recovery land-use history affects the restoration and recovery time of impacted forest sites. The objective of the present study was to assess the effects of different land-use histories (low-impact logging - LL, high-impact logging - HL, and slash-and-burn - SB) on quantitative (diversity values) and qualitative (floristic composition) measures of forest recovery. This research was conducted in Atlantic rainforest areas of Bahia State, Brazil, which had remained undisturbed for 50 to 60 years after human disturbance. Surprisingly, the area subjected to the most aggressive usage (SB) showed intermediate richness and diversity values, but had a floristic composition dominated by pioneer species similar to early-successional forests. Families typical of preserved areas (Sapotaceae and Myrtaceae) were more diverse in LL and HL areas. Our results indicate both quantitative and qualitative recovery in areas subjected to LL, which tended to recover without intervention. Areas subjected to HL showed intermediate qualitative recovery and the lowest quantitative recovery, and may therefore require enrichment to accelerate recovery. Despite good quantitative (species richness and diversity) recovery, the slash-and-burn areas had a predominance of early successional species, which indicates that enrichment actions are essential for the recovery of these forest areas. Knowledge of how land-use history influences forest restoration processes can guide management actions and thereby contribute to the allocation of resources where they are really needed. © Larissa Rocha-Santos and Daniela C. Talora.