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The Amazon region has been undergoing intense changes in land use, impacting the dynamics of forests. Therefore, the study aimed to analyze the hourly behavior of the microclimate and CO2 flow in the dry period of 2022 in a forest area in the Jaru Biological Reserve. The variables of relative and specific air humidity, air temperature, photosynthetically active radiation (PAR), shortwave radiation, wind speed and CO2 flux were used. The CO2 flow was measured by the Eddy Covariance system. A peak in CO2 emission was observed at dawn due to low nighttime turbulence. Relative air humidity was inversely proportional to air temperature. In turn, incident shortwave radiation and PAR reached their highest at 12:30 pm. When analyzing the days with the highest CO2 absorption and emission, it was found that wind speed, temperature and specific air humidity presented higher values corresponding to the days with the highest CO2 emission. Based on the above, it is noted that CO2 has a complex relationship with the microclimate.

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CO2 Flow Dynamics in a Primary Forest Area in Western Amazon in the Dry Period of 2022

  • 章节

  • 发表日期：

    2025年

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  • Ediane Carvalho Ferreira,
  • Alberto Dresch Webler,
  • Gutieres Camatta Barbino,
  • Nara Luísa Reis de Andrade,
  • Barbara Antonucci

摘要

The Amazon region has been undergoing intense changes in land use, impacting the dynamics of forests. Therefore, the study aimed to analyze the hourly behavior of the microclimate and CO2 flow in the dry period of 2022 in a forest area in the Jaru Biological Reserve. The variables of relative and specific air humidity, air temperature, photosynthetically active radiation (PAR), shortwave radiation, wind speed and CO2 flux were used. The CO2 flow was measured by the Eddy Covariance system. A peak in CO2 emission was observed at dawn due to low nighttime turbulence. Relative air humidity was inversely proportional to air temperature. In turn, incident shortwave radiation and PAR reached their highest at 12:30 pm. When analyzing the days with the highest CO2 absorption and emission, it was found that wind speed, temperature and specific air humidity presented higher values corresponding to the days with the highest CO2 emission. Based on the above, it is noted that CO2 has a complex relationship with the microclimate.