Banca de QUALIFICAÇÃO: JEANNE RAQUEL DE ANDRADE FRANCO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : JEANNE RAQUEL DE ANDRADE FRANCO
DATE: 10/12/2021
TIME: 14:00
LOCAL: Google Meets
TITLE:

Interactions of Herbaceous and Woody Vegetation: Implications for Ecological Restoration and Conservation in the Semiarid

KEY WORDS:

Caatinga; Climbers; Herbaceous vegetation; Degraded areas; Drylands; Invasive species; Succession

PAGES: 181
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

The Caatinga biome is one of the largest seasonally dry tropical forests in the world and home to a high diversity of species. Despite this, this biome is susceptible to anthropogenic disturbances and invasion of exotic species, which leads to the loss of native species. Non-tree life forms also contribute to the richness and functioning of the ecosystem, but little is known about the interactions between herbaceous and tree communities. The objective of the first chapter was to evaluate the influence of herbaceous vegetation on the colonization of two native species Anadenanthera colubrina and Astronium urundeuva and an exotic species Leucaena leucocephala in a degraded area. We found that the herbaceous vegetation impairs the growth of the native tree species and has a neutral effect on germination, establishment, and growth of the exotic species. These results raise important questions about restoration methods with native species and management of exotic species in the Caatinga. The objective of the second chapter was to evaluate how tree diversity (control, 1, 2, 4, 8, and 16 species) and their compositions affect the richness, percent cover, height, and composition of herbaceous vegetation. Diversity did not affect the richness, height, and percent cover of the herbaceous vegetation; however, differences in percent cover per species occurred between levels of tree diversity. Composition interfered with height, percent cover, richness, and composition of herbaceous vegetation, indicating that species composition during the initial growth phase of arboreal trees is important for planning restoration methods. The objective of the third chapter was to evaluate how percent cover, richness, and structure of herbaceous vegetation, including interactions with tree diversity, affect seedling growth and survival of 16 native tree species. Occurred negative and positive effects for interactions between herbaceous and arboreal vegetation. The diversity and herbaceous richness treatments showed stronger effects on growth and survival of tree species compared to percent cover and height of herbaceous vegetation. The fourth chapter was to evaluate the effect of herbaceous climbers on growth and survival of tree species in 2019 and to evaluate the dynamics of climbers incidence over time (2017 to 2019) and at different levels of tree diversity. The fifth chapter is part of the development of a field guide on the herbaceous species of the Caatinga, including herbs, grasses, climbers, subshrubs, and shrubs. The guide presents botanical descriptions, life forms, distributions, and the ecological, social, and economic importance of each species.

BANKING MEMBERS:
Interno - 1837921 - ALEXANDRE FADIGAS DE SOUZA
Presidente - 1677189 - GISLENE MARIA DA SILVA GANADE
Externo à Instituição - JOMAR GOMES JARDIM - UFSB