Banca de QUALIFICAÇÃO: PRISCILA LIRA DE MEDEIROS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : PRISCILA LIRA DE MEDEIROS
DATA : 26/10/2017
HORA: 14:00
LOCAL: Sala 02 do PPGCFL
TÍTULO:

Production and allocation of biomass and nutritional efficiency of a eucalyptus clone in function of population density, in the coastal region of RN

PALAVRAS-CHAVES:

Plant spacing, Eucalyptus urograndis, biological utilization coefficient, biomass distribution, systematic design.

PÁGINAS: 30
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Silvicultura
ESPECIALIDADE: Nutrição Florestal
RESUMO:

In this experiment was evaluated the effect of different population densities on the production and allocation of biomass and nutritional efficiency of a eucalyptus clone. Twelve population densities were tested, varying from 498 to 13,333 plants per hectare. The evaluations were performed when the trees were 36 months old, determining the total biomass production and the biomass allocation per plant (kg plant-1) and per area (t ha-1), concentration, content and nutritional efficiency of N, P, K, Ca, Mg and S for the components leaves, branches, bark and wood. Data were submitted to analysis of variance and F test, and regression equations were adjusted. The values of total biomass and biomass of the wood per hectare decreased with the reduction of the density of plants, and the values of total biomass and wood biomass per plant increased with the reduction in population density. Proportional allocation of biomass to leaves and branches increased with decreasing plant density, while the proportional allocation of biomass to wood decreased. The highest aerial biomass production per plant (119.5 kg plant-1) was obtained in the density of 2,564 ha-1 trees. The highest density of plants, 13,333 ha-1 trees, provided the highest yield of total biomass (205.5 t ha-1) and wood (159.64 t ha-1) per unit area. With the reduction of population density, there was a linear increase in N and S content in the branches and wood and in the Ca content in the branches; increase in N content in leaves and N, Ca, Mg and S in the bark. The levels of P and K presented quadratic behavior as a function of population density. The content of macronutrients tended to decrease as the population density decreased. The wood was the component that presented the highest values of nutritional efficiency, which tended to decrease with reduction in plant density, with Ca being the only macronutrient that did not show effect in this last parameter. In general, the decrease of the density of plants caused increase in the concentration of some macronutrients, mainly in the bark. It caused reduction in the content and nutritional efficiency, mainly for the production of the wood.

MEMBROS DA BANCA:
Presidente - 1678080 - GUALTER GUENTHER COSTA DA SILVA
Interno - 1605704 - SIDNEY CARLOS PRAXEDES
Externo ao Programa - 1841666 - ERMELINDA MARIA MOTA OLIVEIRA