Banca de DEFESA: DÁRLISON FERNANDES CARVALHO DE ANDRADE
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.DISCENTE : DÁRLISON FERNANDES CARVALHO DE ANDRADE
DATA : 28/01/2020
HORA: 08:00
LOCAL: Auditório NTB
TÍTULO:
Effect of fire on tree vegetation dynamics of a managed forest in Tapajós National Forest, Pará, Brazil
PALAVRAS-CHAVES:
species diversity; recruitment rate; mortality rate; silvicultural treatment; tropical forest
PÁGINAS: 173
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:
Among the disturbances of anthropic origin that occur in tropical forests, fire and its long-term impacts are still poorly known, especially when there are interactions with selective logging. With the monitoring of permanent plots, it is possible to describe the recovery trajectory and better understand the resilience mechanisms of the forest after the occurrence of fires. The objective of my thesis was to answer the following question: how does fire affect the recovery trajectory of a mature forest subjected to selective logging in the Brazilian Amazon? To tackle this question, it was used a set of 60 plots of 0.25 ha (50 m x 50 m; 12 sample hectares) installed in the Tapajós National Forest on 180 hectares of a mature terra firme forest with a history of forest management (1982) and fire (1997), monitored through frequent measurements of trees with DBH ≥ 5 cm, from 1981 to 2012 (31 years). To determine the disturbance effects, basal area, mortality rates, recruitment rates, and species diversity, were compared through Repeated Measures Variance Analysis (ANOVA) and Linear Mixed Effect Models (MLM). The results show that in the Brazilian Amazon, Dense Ombrophilous Forest is resilient to fire. In a short time (15 years after the fire), the undisturbed native forest is able to stabilize its mortality rates and forest structure remains similar to its original conditions, mostly due to mortality is concentrated among small trees (DBH < 20 cm). However, the maintenance of high recruitment rates and the strong presence of pioneer tree species are an indicative that the forest is still recovering. In managed forests affected by fire, logging intensity is a determining factor in the dynamics of tree vegetation, and therefore the resilience of the forest is directly associated with previous conditions of forest structure (basal area and presence of large trees). The combination of reduced impact logging, non-commercial species thinning, and small fires did not cause losses in species diversity, although heavy thinning alters the species composition. In short, forests, with no history of frequent and severe disturbances, are more fire resistant and resilient.
MEMBROS DA BANCA:
Presidente - 1520271 - JOAO RICARDO VASCONCELLOS GAMA
Externa ao Programa - 1122443 - LIA DE OLIVEIRA MELO
Interna - 096.720.282-53 - LUCIETA GUERREIRO MARTORANO - EMBRAPA
Externo ao Programa - 2161642 - RAFAEL RODE
Externo ao Programa - 1738813 - RODRIGO FERREIRA FADINI
Interno - 1795661 - VICTOR HUGO PEREIRA MOUTINHO