Banca de DEFESA: SAIME JOAQUINA SOUZA DE CARVALHO RODRIGUES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : SAIME JOAQUINA SOUZA DE CARVALHO RODRIGUES
DATA : 31/01/2019
HORA: 14:00
LOCAL: Auditório da Pós-graduação em Agronomia
TÍTULO:

CARBON DYNAMICS IN AGROFLORESTAIAL SYSTEMS WITH OIL PALM IN THE EASTERN AMAZON

PALAVRAS-CHAVES:

Oil palm. Cycle of carbon. Biotic and abiotic variables. Diversity of species.

PÁGINAS: 60
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Manejo e Conservação do Solo
RESUMO:

The conversion of forests in the Amazon into agricultural systems results in intense emissions
of trace gases due to fires and decomposition of dead vegetation. Results released by the
Intergovernmental Panel on Climate Change (IPCC) indicate that increasing the concentration
of these gases in the atmosphere will affect all sectors of human activities and ecosystems. In
this context, the use of perennial and arboreal crops such as oil palm (Elaeis guineensis Jacq.)
integrated to agroforestry systems may represent a viable strategy in the Amazon for
immobilization of atmospheric carbon (C). The objective of this job was to evaluate the
dynamics of carbon in agroforestry systems with oil palm in the Eastern Amazon. The study
was out in the municipality of Tomé-Açu / PA in two agroforestry systems with oil palm: AFS
+ (more diversified agroforestry system) and AFS (less diversified agroforestry system) and
successional forest (SF). Soil CO2 efflux was higher in the period of higher soil moisture
(February to July), higher rainfall, higher fine root production (February to March), higher
microbial activity and greater CO2 loss through microbial respiration. In the AFS- it was
observed a higher annual carbon content of the microbial biomass, however it was the treatment
that lost the most C-CO2 by means of the microbial activity, has a lower stock of fine roots and
less deposition of litter in the soil. In AFS+ the loss of C-CO2 via microbial activity was lower,
higher stock of fine roots and greater deposition of litter in relation to AFS -. With the
conversion of SF to AFS with oil palm, there was in the soil increase of 10.06 Mg C ha-1 in
SAF+ and 5.53 Mg C ha-1 in AFS-. The SF stock and produced more litter than AFS. The rate of
decomposition was higher in SF, in relation to AFS. The rate of root decomposition in AFSwas
faster in relation to AFS+ and FS. In AFS- there was higher deposition of N and lower C/N
ratio in the annual litter. In general, the intercropped AFS plantation with oil palm is a viable
alternative to family agriculture in the Amazon, since it has the capacity to accumulate C in the
soil and a dynamics of deposition and cycling of organic material, mainly accumulating C in the
soil.

MEMBROS DA BANCA:
Externo ao Programa - 388426 - FRANCISCO DE ASSIS OLIVEIRA
Externo à Instituição - MARIA DE LOURDES PINHEIRO RUIVO - MPEG
Externo à Instituição - OSVALDO RYOHEI KATO - EMBRAPA
Presidente - 013.474.077-74 - STEEL SILVA VASCONCELOS - UFRA
Externo ao Programa - 585.532.742-68 - VANDA MARIA SALES DE ANDRADE - UFRA
Externo ao Programa - 1741065 - VANIA SILVA DE MELO