ENVIRONMENTAL CONSEQUENCES in rocky mountain coniferous ...

Cutting methods at Coram had a considerable effect on net radiation qt the
surface. Daily totals were nearly the same in the center of a 16-acre clearcut and
a l-acre clearcut--400 cal /cm2/day and 360 cal/cm2/day, respectively (fig. 2). The
diurnal progression for both clearcuts was also similar. But net radiation on the
same day was 70% (1 23 cal/cm2/day) and 46% (219 cal/cm2/day) less for the uncut and
shelterwood areas, respectively. Monthly mean daily amounts showed the same dif-
ferences particularly from May through September (fig. 3). Differences during the
winter months were not as great. It is interesting to note that for some months (i.e.
December) the net radiation showed a net loss of energy. Data from the Lubrecht site
(fig. 4) showed the same differences between the clearcut and uncut treatments.
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Figure 2. --DiurnaZ variation