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We tested the hypothesis that diffuse radiation from cloudy and overcastskies penetrates the canopy more effectively than direct radiation from clearskies. We compared the flux density and spectral properties of direct anddiffuse radiation (around solar noon (±1 h)) above, within and below aforest stand under sunny, cloudy and overcast conditions in a thinned Sitkaspruce (Picea sitchensis (Bong.) Carr.) forest (28 years old, with aleaf area index of approximately 5.2 m2 m−2). We recordedvertical profiles of radiation penetration (from 350 to 1050 nm), and wealso explored the horizontal pattern of radiation along a 115 m transect. We showed that in "clear sky" conditions, the photosynthetically activeradiation in the lower parts of the canopy was substantially attenuated, moreso than under cloudy and overcast skies. It was particularly depleted in theblue part of the spectrum, but only slightly blue-depleted when the sky wasovercast or cloudy. Moreover, the red : far-red ratio under clear skies fell tovalues less than 0.3 but only to 0.6 under cloudy or overcast skies. Near theground, the light climate was strongly influenced by the thinning pattern(carried out in accordance with standard forestry management practice)

Transmissivity of solar radiation within a &lt;i&gt;Picea sitchensis&lt;/i&gt; stand under various sky conditions

Transmissivity of solar radiation within a <i>Picea sitchensis</i> stand under various sky conditions