Banca de DEFESA: MAELLY DALLET ALVES GONÇALVES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MAELLY DALLET ALVES GONÇALVES
DATA : 29/07/2023
HORA: 10:00
LOCAL: Online transmitido via Google Meet - Nova Xavantina - MT
TÍTULO:

Important and so forgotten: diversity and productivity of herbs in phytophysiognomies of the Amazon-Cerrado transition

PALAVRAS-CHAVES:

Floristic composition; Canopy coverage; Biomass; Savanna.

PÁGINAS: 60
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
RESUMO:

Herbaceous plants are usually neglected in ecological studies. They are essential during
the process of ecological succession, as they are important to facilitate the entry of other
species and other strata such as arboreal. Understanding the ecological characteristics of
herbaceous plants is extremely necessary to contribute to the conservation of
biodiversity. In this context, we evaluated the richness, diversity, abundance and
biomass of herbaceous species in a vegetation and light gradient from savannah to forest
in the Amazon-Cerrado transition. We used 1m diameter circles, established in the four
cardinal directions at 5m intervals along four transects in the phytophysiognomies of
rocky cerrado, typical cerrado, dense cerrado, regenerating cerrado and preserved
cerrado, in a Conservation Unit in Nova Xavantina, Mato Grosso, Brazil. We measured
species richness, abundance of individuals and aerial biomass of herbaceous plants. We
also measured the leaf area index (LAI) using hemispherical photographs. In total, we
sampled 2,334 individuals, 132 species/morphospecies and 26 botanical families, with
only four taxa shared between phytophysiognomies. The luminosity exerted influence
on the savanna phytophysiognomies, resulting in a greater richness and abundance of
herbaceous species in comparison to the forest phytophysiognomies. In addition, we
observed a biomass gradient in the herbaceous stratum, with lower values (preserved
savannah = 0.168 ± 0.32) and higher values of Leaf Area Index (preserved savannah =
3.46 ± 0.10 m²/m²) in forest phytophysiognomies, and, on the other hand, higher values
(cerrado rupestre = 19.6 ± 21.8) and lower values of LAI in the savannah formations
(cerrado rupestre = 0.90 ± 0.10 m²/m²). The reduction of light intensity affects the
structure of the herbaceous plant community, establishing a more accentuated biomass
gradient in the savannah formations, which makes these environments richer and more
diversified. Our resarch is relevant to the ecological understanding of these ecosystems
and can support management and conservation strategies for this often neglected, but
important and essential, stratum in the plant communities of the transition region
between the Amazon and the Cerrado.

MEMBROS DA BANCA:
Externo à Instituição - HALINA SOARES JANCOSKI - UNEMAT
Presidente - PAJ042729 - IMMACULADA OLIVERAS MENOR - York
Interno - 986.188.651-68 - SIMONE MATIAS DE ALMEIDA REIS - UNEMAT