CO2 FLOWS IN A SOUTHERN TROPICAL FOREST AREA IN THE WESTERN AMAZON IN A YEAR OF EL NIÑO

Ano: 2018 | Volume: 40 | Número: Especial

Autores: Bárbara Antonucci, Renata Gonçalves Aguiar, Leonardo José Gonçalves Aguiar, Nara Luísa Reis de Andrade

Palavras-chave: carbon, microclimate, variability

Resumo Inglês:

The objective of this work was to quantify the hourly variability of CO ₂ fluxes  in El Niño year, in 2015, in a tropical rain forest in the Western Amazon. Data of CO ₂ fluxes  collected at 63.5 m height were analyzed in a tower of the Large Scale Biosphere-Atmosphere Program in the Amazon in the Jaru Biological Reserve, composed of Opened Ombrófila forest. Data from the dry-wet period were used, by convention, negative and positive values ​​indicate CO ₂ uptake and emission , respectively. The CO ₂ uptake  in the forest had higher levels between 9:30 am and 4:00 pm, with mean values ​​between -19 and -13 μmol m ^-2  s ^-1, however the absorption peak occurred at 13 h with -30 μmol m ^-2 s ^-1 , given that at this time the sun's rays are more intense. On average, Rebio Jaru absorbed more than Amazonia-Cerrado transition areas, indicating that the physiological activities in ombrophilous forests demand more carbon. The average daily behavior of the CO ₂ flux  presented higher values ​​of absorption during the day than the emission at night, being a carbon sink, corroborating the importance of the forest in the assimilation of the atmospheric carbon.