Fig. 3. Percent of full open photosynthetic photon flux densities received in gaps between April 15 and September 15 at the
latitude of the Date Creek silvicultural system study. Gaps vary in size from 5 m diameter (0.002 ha) to 150 m diameter (1.77 ha), with a canopy height of 30 m. Photosynthetic photon flux densities were estimated using the model CLiMo. version 2.0 (Chen et al.. 1993).