Banca de QUALIFICAÇÃO: LENA MONTEIRO COSTA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LENA MONTEIRO COSTA
DATE: 23/06/2023
TIME: 09:00
LOCAL: Remoto (Google Meet)
TITLE:

ESTRUTURA DE FLORESTAS SECUNDÁRIAS NOS SISTEMAS DE MANEJO COM E SEM QUEIMA EM UM FRAGMENTO EXPERIMENTAL EM IGARAPÉ-AÇU

KEY WORDS:

slash and burn, slash and burn, secondary forest structure

PAGES: 32
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUMMARY:

Most ecosystems and their forest communities are in a secondary stage of succession,
resulting not only from stochastic natural events, but mainly related to land use that, at
different levels, cause some disturbance and destructure them. The state of Pará
contributed more than 39% of deforestation in the Legal Amazon in 2021. The advance
of suppression of primary and secondary vegetation compromises carbon sequestration
and storage, an important function of these ecosystems for the planet's climate regulation.
The Bragantina region in the northeast of the state of Pará, presents about 75% is covered
with secondary vegetation in place of primary forest, resulting from the practice of slash
and burn. In this context, the work was developed under the Tipitamba project, aims to
evaluate the influence of the method of area preparation in the slash and burn and slash
and burn systems on the regeneration of the capoeira in an experimental fragment located
in Igarapé-açu. The next step is to obtain indications of the impact of these agricultural
systems on the environment in order to assess the sustainability of these practices. The
plots sampled are from a long-term study of secondary vegetation management in family
agriculture linked to the SHIFT-Capoeira Project, now called Tipitamba. In a 21 year old
secondary forest, two systems, slash and burn (CT) and slash and burn (CQ), were
installed in adjacent areas of 2 ha each and a 2 ha fragment of the successional forest was
preserved as Reference (R). A phytosociological structure survey of tree regeneration was
conducted. Ten plots were deployed in the CQ, CT and R areas, with dimensions of 10 m
x 10 m each, systematically arranged, included all individuals with diameter at breast
height - DAP≥2.0 cm for the CQ, CT and R areas. For the measurement of total height
(HT) visual estimates were applied. The inventoried individuals were identified with their
respective scientific names by two parabotanists in the field belonging to EMBRAPA
ORIENTAL and later, confirmed in the literature. For a more detailed analysis it was
found, after searches in the library collection of Embrapa Oriental, inventory data that
occurred in 2016, before the area preparation that occurred in 2017/2018. Thus, together
with the data made in 2022, there was analysis of all this data. In 2016 and 2022, a mean
diversity (H') of 2.14 and 1.35 were found for CT and 2.06 and 1.93 for CQ, the mean
density was 3220 and 2950 ind. ha-1 in CT and 2550 and 3990 ind. ha-1 in CQ, the
estimated dry biomass for CT was 3.40 and 4.15 ton ha-1 and 1.40 and 2.52 ton ha-1 for
CQ. Respectively the results. Statistical differences (ANOVA; P < 0.05) occurred in
structural and biomass parameters indicating that CT facilitates the development of the
tree component of forests.

BANKING MEMBERS:
Presidente - 094.373.632-34 - OSVALDO RYOHEI KATO - UFRA
Interna - 2410727 - LINA BUFALINO
Externo ao Programa - 2666821 - BRENO PINTO RAYOL
Externa à Instituição - SAIME JOAQUINA SOUZA DE CARVALHO RODRIGUES - ITERPA
Externo à Instituição - SILVIO ROBERTO MIRANDA DOS SANTOS - UFRA