Banca de QUALIFICAÇÃO: JOSE WEMERSON SOARES DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : JOSE WEMERSON SOARES DA SILVA
DATA : 24/12/2023
HORA: 10:00
LOCAL: Online transmitido via Google Meet
TÍTULO:

EVALUATION OF RELATIONS BETWEEN CONDUCTANCE STOMATIC, LEAF WATER POTENTIAL AND VPD IN
AREAS OF THE SOUTHERN EDGE OF THE AMAZON

PALAVRAS-CHAVES:

 amazon forest, climate change, water sensitivity, vpd.

PÁGINAS: 33
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
RESUMO:

Tropical forests represent a large portion of the vegetation cover and are characterized by
their great provision of ecosystem services, including biodiversity, carbon capture and
regulation of the hydrological cycle. Constant changes in precipitation, temperature and
VPD rates constantly threaten the maintenance and permanence of these services. In recent
decades, the southern edge of the Brazilian Amazon is a region that has experienced the
greatest changes in climate and vertiginous reduction of forest area due to deforestation.
The southern edge of the Amazon, then, represents a key region for studying regulatory
characteristics that regulate the vulnerability of Amazonian trees to climate change. Due to
the fundamental importance of stomata in controlling the water and carbon balance of
plants, understanding how stomatal control strategies vary among southern Amazonian
trees, as yet unknown, limits our ability to predict how these forests will respond to
changes more intense in climate. In order to fill this gap, this work aimed to evaluate the
relationship between stomatal conductance, leaf water potential and vapor pressure deficit
(VPD) in three forest plots on the southern edge of the Brazilian Amazon. In all, 60
individuals were measured, corresponding to the 10 most dominant species in each plot.
After inducing the branches of the plants to conditions of maximum hydraulic
conductivity, stomatal conductance, leaf water potential and DPV were measured
simultaneously. Preliminarily, through a simple linear regression, it can be observed that
for most of the species in the three sites, a decrease in the leaf water potential with
progressive increases in the VPD. Stomatal conductance rates did not show a clear pattern
for all species when exposed to progressive increases in VPD.

MEMBROS DA BANCA:
Interno - 82329001 - BEN HUR MARIMON JUNIOR
Interno - 606.226.102-44 - DAVID ROBERTO GALBRAITH - ED