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Banca de DEFESA: MYCHELLYNE MARIA SILVA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MYCHELLYNE MARIA SILVA SILVA
DATE: 30/04/2025
TIME: 14:00
LOCAL: on- line
TITLE: "Dynamics of woody species communities subjected to different fire intensities in the Amazon – Cerrado transition."

KEY WORDS:

Tropical forests; Forest fire; Experimental burning; Loss of biodiversity; Tree mortality

PAGES: 73
BIG AREA: Ciências Biológicas
AREA: Botânica
SUMMARY:

The response of woody communities to fire is essential for understanding the resilience of tropical

forests in regions where this disturbance has increased in frequency and intensity. In the southeastern Amazon, fragmentation and forest fires have altered the structure, functioning, and dynamics of forests, impacting their diversity and

composition. To assess the effects of fire and forest recovery, we conducted a controlled burning experiment at the Tanguro

Research Station, Querência–MT, in a seasonally dry forest. The study included 60 plots of 20 × 20 m, with 19 control plots

and 41 subjected to experimental burns between 2013 and 2016. We conducted floristic inventories in 2013, 2015, 2019,

and 2023, recording 4,590 individuals. Based on these data, we calculated annual mortality, recruitment, and aboveground

biomass rates. Additionally, we calculated the Bray-Curtis dissimilarity index and performed ANOVA, PCoA, and ANOSIM

analyses to evaluate how fire impacted vegetation over time. The results showed that burned plots exhibited a significant

increase in individual density and species recruitment. This increase in density in burned plots occurred due to higher light

availability and lower competition resulting from tree mortality, which favors the recruitment of fast-growing pioneer

species. Mortality was significantly higher in burned plots, peaking in 2015 and 2019. The burned areas also developed an

increasingly distinct floristic composition compared to the control plots. Fire caused prolonged effects on species richness,

leading to a growing differentiation between burned and control plots. Our results indicate that fire induces long-term

structural changes, increasing tree mortality, favoring pioneer species, and enhancing floristic dissimilarity between burned

and control plots. Although the forest shows a capacity for recovery, this process has been long-term, potentially

compromising the ecosystem services provided by the region's forests.

COMMITTEE MEMBERS:
Externo à Instituição - Antônio Carlos Silveiro da Silva
Externo ao Programa - 3160854 - DIVINO VICENTE SILVERIO - nullExterno à Instituição - HENRIQUE AUGUSTO MEWS - UFR
Presidente - ***.195.841-** - LEANDRO MARACAHIPES DOS SANTOS - NENHUMA
Externa à Instituição - Letícia Gomes - UNEMAT

Notícia cadastrada em: 09/04/2025 10:35