Banca de QUALIFICAÇÃO: JULIE ANDREWS DE FRANÇA E SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : JULIE ANDREWS DE FRANÇA E SILVA
DATA : 30/07/2019
HORA: 09:00
LOCAL: ICA/FLORESTA SALA 01
TÍTULO:

CHANGE OF CO2 AND SUPERFICIAL ENERGY FLOWS IN AN INTERSPECIFIC HYBRID OIL PALM PLANTATION (Elaeis guineensis x Elaeis oleifera) AND A PRIMARY FOREST DURING THE CHILD IN THE AMAZON LESTE

PALAVRAS-CHAVES:

CO₂ assimilation. Latent heat flux. Sensible heat flux. Land use types. El Niño. Eastern Amazon

PÁGINAS: 68
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
RESUMO:

The Amazon is considered the biggest reserve of biological biodiversity in the world. However, the current landscape of the forest is a consequence of the integrated measure of disturbances that have occurred in recent years due to economic development. Oil Palm Plantation has been growing in the state of Pará owing to the great potential of the region for the implantation of the crop and the energy input. Land-use change implies the exchange of ecosystem services such as climate regulation, hydrological balance and biodiversity. In this context, the thesis aims to estimate CO₂ gas exchange and surface energy fluxes, defining the environmental variables that control these processes on a spatial and seasonal scale in two vegetation cover in eastern Amazonia during the El Niño of 2015/2016. The micrometeorological variables were obtained in two towers installed in a 12-year-old oil palm plantation and a primary forest (Caxiuanã National Forest). The measurements were obtained on a 30-minute time basis for the meteorological variables (air temperature and relative humidity, short-wave and long-wave radiation, photosynthetically active radiation, precipitation, soil moisture and others) and fluxes data of CO₂ and H₂O at a high frequency of 10 Hz (ten times per second), being calculated by the Eddy Covariance (EC) method. In order to obtain the photosynthetic parameters, a Light Response Curve was applied to oil palm plantation. The data collected were analyzed and certified according to the LBA Project micrometeorology protocol. In preliminary results, oil palm plantation in the year of severe presented greater CO₂ assimilation in the rainy season with -22.50 (± 0.40) μmol m-² s-¹ and the maximum photosynthetic rate consolidated the value obtained by the daily mean of the NEE. The rainy season had lower quantum efficiency (0.0479 ± 0.0039 μmol CO₂ μmol-¹ photon absorbed), higher rate of CO₂ assimilation (35.82 ± 1.92 μmol m-² s -1) and less ecosystemic respiration (6.11 ± 0.39 μmol m-2 s-1). The meteorological variables such as photosynthetically active radiation and vapour-pressure deficit predicted the net CO₂ exchange in both periods, with a correlation coefficient equal to 0.75 and 0.72 and a determination of 0.56 and 0.52 in the rainy and less rainy period, respectively.

MEMBROS DA BANCA:
Interno - 2595267 - CANDIDO FERREIRA DE OLIVEIRA NETO
Presidente - 388426 - FRANCISCO DE ASSIS OLIVEIRA