Abstract
Vertical profiles of air temperature, humidity, wind speed and photosynthetically active radiation were examined systematically within and above a primary Amazonian rain forest in Southern Venezuela. During daylight hours the observed gradients of temperature and humidity suggest that turbulent mixing between vegetation and the atmosphere is reasonably efficient in the top two-thirds of the forest, whereas the understorey remains partially isolated. At night, however, the canopy exhibits a significant decoupling from the overlying atmospheric layer due to substantial radiative cooling, causing a stable density stratification above. It is fairly clear that these variations in microclimate produce a spectrum of different living conditions for the flora and fauna.
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