Banca de DEFESA: LUCAS HEBER MARIANO DOS SANTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUCAS HEBER MARIANO DOS SANTO
DATA : 30/11/2020
HORA: 14:00
LOCAL: virtual por Zoom
TÍTULO:

Border and fire effects on community regeneration in a forest in the Amazonia-Cerrado transition

PALAVRAS-CHAVES:

transitional forest; fire; regeneration; understory; liana; seedlings

PÁGINAS: 30
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
RESUMO:

Understanding how forests and their edges behave after fire events is of the utmost importance, as it allows for a better understanding of the feedbacks that maintain the process of forest degradation beginning at the edge and advancing into the forest. However, most studies do not consider the interrelationship of disturbance that normally occur. In addition, often in studies of vegetation response to disturbances, studies do not focus on small individuals who can provide direct information about the succession process. In this study we evaluated the effects of three experimental burn regimes (unburned, burned annually and burnt three times) nine years after the last fire, from different distances to an agricultural border and canopy structure using LIDAR metrics on the diversity of two strata (Seedling: <1 cm; saplings: <5 cm in diameter) of the regenerating community of three areas in the Amazon-Cerrado transition using regressions. We found that although burnt stands regained richness compared to unburned control, the composition changed completely with the edge species advancing into the forest, this composition being controlled by the crown characteristics and distance from the edge. In addition, we found that the canopy structure is highly related to edge distance, independent of burn regime, with the lowest and least complex canopy near the edge. There was no difference in the average proportion of lianas per plot among the seedling areas, but in saplings, the area burned annually outperformed the others. In addition, the proportion of lianas per plot generally increased away from the seedling border and the tree fell. Seedling liana abundance was also higher in the unburned control, while in trees, treatments and distance to the edge had no effect on abundance. These responses point to complex patterns of degradation with various disorders interacting and acting at the same time. We conclude that the time since the last burn was not sufficient to recover the burned forests and that the distance to the edge creates a compositional gradient that allows some species to advance into the forest during the post-disturbance recovery period.

MEMBROS DA BANCA:
Presidente - 736.660.411-91 - TED RONALD FELDPAUSCH - NENHUMA
Externo ao Programa - 200202001 - PAULO SERGIO MORANDI
Externo à Instituição - LIDIANY CAMILA DA SILVA CARVALHO - UENF
Externo à Instituição - EDMAR ALMEIDA DE OLIVEIRA - UNEMAT
Externo à Instituição - PAULO MONTEIRO BRANDO - IPAM