Banca de DEFESA: LENA MONTEIRO COSTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LENA MONTEIRO COSTA
DATE: 30/11/2023
TIME: 09:00
LOCAL: google meet
TITLE:

STRUCTURE OF SECONDARY FORESTS IN MANAGEMENT SYSTEMS WITH AND WITHOUT BURNING IN IGARAPÉ-AÇU, PARÁ

KEY WORDS:

Cutting, Burning, Crushing, Structure, Secondary Forests

PAGES: 51
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 which, at different levels, cause some disturbance and disrupt them. Burning an area for the implementation of swidden land causes the death of soil organisms and considerable loss of nutrients, compromising carbon sequestration and storage, an important function of these ecosystems for regulating the planet's climate. An alternative to replacing this action is cutting and crushing the capoeira, as it leaves a dense layer of phytomass on the surface of the land covering and protecting the soil against erosion. In this context, the work aims to evaluate the influence of area preparation methods in the Cutting and Grinding (CT) and Cutting and Burning (CQ) systems on capoeira regeneration and biomass production in an experimental fragment located in Igarapé-açu. For this, the sampled plots come from a long-term study of secondary vegetation management in family farming linked to the SHIFT-Capoeira Project, today called Tipitamba. In a 21-year-old secondary forest, divided into two adjacent areas of 2ha each, were prepared with the CT and CQ methods, and a 2-ha fragment of the successional forest was conserved as Reference (R). A survey of the phytosociological structure of tree regeneration was carried out. 10 plots were implemented in the areas of CQ, CT and R, with dimensions of 10 m x 10 m each, arranged systematically. The analyzes included all individuals with diameter at breast height – DBH≥2.0 cm and measured at total height (HT). The inventoried individuals were identified with their respective scientific names by two parabotanists in the field belonging to EMBRAPA ORIENTAL. In the years 2016 and 2022, respectively, an average diversity (H’) of 2.14 and 1.35 was found for the CT; 2.06 and 1.93 for CQ; and 2.09 and 2.20 for the R area, the average density was 32.2 and 29.5 ind. ha־¹ in CT; 25.5 and 39.9 ind. ha־¹ in CQ; and 28.8 and 24.6 for the R area, the estimated dry biomass for the CT was 3.40 and 4.15 ton ha־¹; 1.40 and 2.52 ton ha־¹ for CQ; and 5.27 and 4.93 ton ha־¹ for the R area. Statistical differences (ANOVA; P < 0.05) occurred in structural parameters and biomass, indicating that CT facilitates the development of the arboreal component of forests and greater stock of carbon.

BANKING MEMBERS:
Externo ao Programa - 2666821 - BRENO PINTO RAYOL
Externa à Instituição - GISELE DO SOCORRO DOS SANTOS POMPEU - UFPA
Presidente - 094.373.632-34 - OSVALDO RYOHEI KATO - UFRA
Externa à Instituição - SAIME JOAQUINA SOUZA DE CARVALHO RODRIGUES - UFRA
Externo à Instituição - SILVIO ROBERTO MIRANDA DOS SANTOS - UFRA