Banca de DEFESA: KARINE COSTA DE ALMEIDA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : KARINE COSTA DE ALMEIDA
DATA : 27/02/2020
HORA: 09:00
LOCAL: Auditório do Departamento de Solos, UFRA
TÍTULO:

Oil palm residue decomposition in agroforestry and monoculture system in northeastern Pará

PALAVRAS-CHAVES:

Agroforest, Amazon, Nutrient cycling, Oil palm, Mass loss

PÁGINAS: 40
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Manejo e Conservação do Solo
RESUMO:

Decomposition is a crucial process for nutrient cycling and carbon storage in ecosystems, but the amount of studies investigating this process in agroforestry systems is still small. The decomposition and release of nitrogen (N) from palm oil residues was evaluated in two agroforestry systems (SAFs) and in a monoculture, both located in northeastern Pará. The residues were classified as empty fruit bunches (CFV), foliole (FOL), rachis (RAQ) and petiole (PEC). During three months of experiment, the mass loss of residue samples ranged from 45% (FOL) to 66% (PEC) in SAFs to 44% (CFV) and 58% (RAQ) in monoculture. Decomposition constants ranged from 0.004 to 0.008 month -1 in FAS and between 0.006 and 0.008 month -1 in monoculture. FOL and CFV presented the highest N concentration and the lowest C/N and lignin/N ratio. N concentration and C/N and lignin/N ratios correlated significantly with decomposition rate (r = 0.73, -0.74 and -0.76, n = 12, P <0.001, respectively). These results suggest that the faster decomposition of FOL and CFV is due to the higher quality of these residues (high N concentration and low C / N and lignin / N ratios). N release in all cultivation systems was also higher by FOL and CFV.

MEMBROS DA BANCA:
Presidente - 013.474.077-74 - STEEL SILVA VASCONCELOS - UFRA
Externo à Instituição - HELEN MONIQUE NASCIMENTO RAMOS - ICRAF
Externo à Instituição - OSVALDO RYOHEI KATO - EMBRAPA
Externo à Instituição - SÍLVIA FERNANDA MARDEGAN - UFPA