Banca de DEFESA: BRUNA INGRID ARAUJO SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : BRUNA INGRID ARAUJO SILVA
DATA : 27/02/2019
HORA: 14:00
LOCAL: Auditório da Coordenação de Botânica - Campus do MPEG
TÍTULO:

Predation of brazil nut seedlings in area under forest restoration in Amazon

PALAVRAS-CHAVES:

ecological restoration; silvicultural treatments; brazil nuts; wild rodents

PÁGINAS: 51
GRANDE ÁREA: Ciências Biológicas
ÁREA: Botânica
RESUMO:

The use of brazil nut trees (Bertholletia excelsa Bonpl), in the forest restoration and recovery of degraded areas in the Amazon, have been promising due to their favorable silvicultural characteristics and the socioeconomic benefits that the species can bring. However, when used in abandoned pasture areas, their survival rate can be strongly threatened by the predation of rodents in disturbed areas. Faced with this problem for the forest restoration with this species in pasture areas, it is necessary to carry out management studies that aim to reduce the damages caused by these mammals and consequently increase survival rates. In this way, the objective of this work was to evaluate the predation of brown tree seedlings by rodents in abandoned pasture under a forest restoration process and its relationship with silvicultural treatments. Three treatments were performed: Area 1 with physical silvicultural treatments; Area 2 - with physical and chemical silvicultural treatments; Area 3 - with physical and chemical silvicultural treatments and use of seedlings. Each treatment had 5 replicates in plots of 1 ha^-1 each with a total of 345 seedlings per treatment distributed in the 12 x 12 m spacing. Monitoring was carried out in 2016 and 2017, in which the number of plants damaged and killed by wild rodents and other factors were identified and counted in the spreadsheet. Data were submitted to normality tests and test t Student's at 1% for comparison of means between areas. Rodent mortality in Area 1 was 27.5% and other factors reached 25.1%. In areas 2 and 3 there was no attack of rodents, with mortality by other factors of 4.2% and 14.1%, respectively. It has been found that the high predation rate in Area 1 is directly associated with the presence of fast growing exotic grasses, which provided shelter and protection for rodent feeding at lower risk of being hunted by other animals. The presence of these grasses may reduce seedling survival rates, both as a shelter for rodents, and to limit seedlings' access to light, water and nutrients. It is recommended that in pasture areas under restoration with chestnut tree, adequate control of the grass in the early years be done with the use of semi-mechanized weeding and chemical (herbicide) to avoid rodent attack and competition with seedlings.

MEMBROS DA BANCA:
Externo ao Programa - 388504 - ANTONIO CORDEIRO DE SANTANA
Interno - 180.330.242-91 - IMA CÉLIA GUIMARÃES VIEIRA - MPEG
Externo à Instituição - LEANDRO VALLE FERREIRA - MPEG
Presidente - 261.375.266-15 - RAFAEL DE PAIVA SALOMÃO - MPEG
Externo à Instituição - SILVIO BRIENZA JÚNIOR - EMBRAPA