Banca de DEFESA: ELIZANE ALVES ARRAES ARAÚJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ELIZANE ALVES ARRAES ARAÚJO
DATE: 31/10/2020
TIME: 15:00
LOCAL: Remota
TITLE:

SOIL SEED BANK IN A SUCCESSIONAL ECOSYSTEM IN THE EASTERN AMAZON, BRAZIL.

KEY WORDS:

Succession; regeneration of forests; diversity of stored seeds.

PAGES: 40
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUMMARY:

The seed bank is an important indicator for assessing restored areas as it is a response to the dynamic process of succession, representing part of the potential stock of individuals within the ecosystem. Thus, the objective of the present study was to evaluate forest structure and composition of the seed bank in a successional area 32 years after multiple cycles, with plots subjected to different treatments. The 120 samples, distributed in three treatments, were obtained with the aid of a hollow sampler in a square format with an area of 0.0625m², in the evaluation period of eight months. A total of 1810 seeds were identified, distributed in 32 species and 26 families, with a total density of 692 ind./m². The speeds and the average time of emergencies of the treatments, varied from 2.5 to 6.13 seeds emerged per day and on average from 60 to 54 days. As for the density and number of emerged seeds, the highest occurred in the Control treatment, followed by the Irrigation treatment, and the lowest value for the Removal treatment, with significant differences (p <0.01) for the density variable. The estimated degree of equability (J ') closest to one was that of the Controls plots (0.78), which differed significantly from the other plots (p <0.05) and Shannon the values indicated better homogeneity of the seed bank in the plots of Removal that presented lower value (p <0.05), which means that few species from the collection site are responsible for the highest proportion of seeds in the soil. The species present in the seed bank were classified according to the dispersion syndrome, life form and ecological group, with an emphasis on the zoochoric dispersion, shrub form and pioneer individuals, respectively. This study provides important information that characterizes the seed bank in forest ecosystems regeneration process, indicating that pioneer tree and shrub individuals are responsible for the post-disturbance process.

BANKING MEMBERS:
Externo ao Programa - 2666821 - BRENO PINTO RAYOL
Presidente - 388426 - FRANCISCO DE ASSIS OLIVEIRA
Interno - 741.673.590-49 - GUSTAVO SCHWARTZ - EMBRAPA
Externa à Instituição - VANDA MARIA SALES DE ANDRADE - NENHUMA