2022/12/01 by Alan Pena de SOUZA, Ricardo Antonio MARENCO · 4 citations
Environmental Science · Mathematics · #Atmospheric sciences #Biology #Botany #Dry season #Ecology #Environmental and biological studies #Environmental science #Forest ecology and management #Horticulture #Hydrology (agriculture) #Irradiance #Mathematics #Photosynthesis #Plant Water Relations and Carbon Dynamics #Principal component analysis #Transpiration #Vapour Pressure Deficit
paper · pdf · doi:10.1590/1809-4392202103390
published in Acta Amazonica 52(4), 277-284 (National Institute of Amazonian Research)
openalex publication_date 2022/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
ABSTRACT In a typical year in the central Amazon, there is a mild dry season, but its effect on stem growth of multipurpose forest tree species is not yet well known. This study aimed to determine the individual effect of microclimatic parameters on stem growth after removing the influence of intercorrelation among microclimatic variables. Monthly stem diameter increment was measured in six species (46 trees) from January 2018 to December 2020. Microclimatic variables recorded were irradiance, air temperature, rainfall, and vapor pressure deficit. Principal component regression was used to assess the effect of micrometeorological variability on stem growth. On average, stem growth increased with an increase in rainfall and soil water content, but decreased with rise in maximum temperature and maximum vapor pressure deficit. These findings indicate that, when removing the effect of intercorrelation between microclimatic parameters, vapor pressure deficit may, in fact, affect stem growth. We demonstrate that the reduction in stem growth during the dry season can also be related to an increase in maximum temperature and maximum vapor pressure deficit, and not only to a decline in soil water content.