Banca de DEFESA: ANA BEATRIZ SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANA BEATRIZ SILVA
DATA : 30/03/2021
HORA: 08:00
LOCAL: Virtual
TÍTULO:

EFFECTS OF SLASH-AND-BURN AGRICULTURE ON CAATINGA REGENERATION

PALAVRAS-CHAVES:

Chronic anthropogenic disturbance; Secondary Forests; Slash-and-burn agriculture; Regeneration mechanisms; Resilience; Tropical Seasonally Dry Forest.

PÁGINAS: 60
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

Slash and burn agriculture is an ancient practice that promotes changes in the dynamics of many forests around the world. In seasonally tropical dry forests, such as the Caatinga, this practice has led to changes in the course of the regeneration of plant species. Our study sought to evaluate the frequency of certain regeneration mechanisms at different stages of succession, in addition to changes in different components in the Caatinga of Pernambuco. For that, several parameters were measured (i.e., basal area, height, number of roots and species richness) in woody plants (> 3cm DAS) in three stages of regeneration: swidden, areas with more than 10 years of abandonment, and forest mature. As a result, except for species composition, areas of regeneration did not
differ from mature forest areas in any of our metrics. The vegetative reproduction mechanism (vegetative propagation and resprout) was equally frequent in all areas, and not as expected (more frequent in the initial stages). A basal area above the ground varied in total, but not average, indicating that in the swidden areas there was less, but on average they were similar in size to the others in the other areas. The basal area below the ground varied in average values (with the swidden a greater value than mature forest) and not in total values, that the species of the swidden emit much more roots to be able to remain in that area, even with less. The compound was dominated by a high degree of species substitution, linked to species selection by farmers, in addition to environmental effects. The permanence of this type of management seems to directly interfere with the forest dynamics, creating new scenarios for intervention and management practices.

MEMBROS DA BANCA:
Presidente - 3054284 - PAVEL DODONOV
Externo(a) à Instituição - RAFAEL DE OLIVEIRA XAVIER - UNICAMP
Externo(a) à Instituição - RAQUEL CAROLINA MIATTO - USP