Abstract

Estimates of transmitted global radiation beneath lodgepole pine and Douglas-fir canopies were made using eight fixed and one moving sensor. One sensor was moved along a 65 m track; eight additional sensors were spaced about the track in a fixed grid. Estimates of transmitted global radiation using the two systems were in close agreement if averaged over periods greater than six hours. Hourly estimates of transmitted radiation were significantly different, particularly during midday.

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