ENVIRONMENTAL CONSEQUENCES in rocky mountain coniferous ...

TABLE 3. Pre- and post-logging volume of wood - > 3 in (7.6 cm) diameter in shelterwood
units.
% of oriainal
Utilization
Su btreatrnent
Pre-1 ogging
ft3/acre m3/ha
LOWER SHELTERWOOD
Post-1 ogging
ft3/acre m3/ha
volume remaining
after treatment
Sawlog (SL) 4,972 (348) 3,669 (257) 74%
Intensive Log (IL) 5,280 (369) 3,645 (254) 69%
Intensive Tree (IT) 6,841 (478) 3,849 (269) 56%
Near Complete (NC) 5,862 ((4101 2,763 47 %
TOTALS 22,955 1605 - 13,926 Mean -6i%
HIGHER SHELTERWOOD
Sawlog (SL) 4,410 (309) 3,778 (265) 86%
Intensive Log (IL) 4,961 (347) 3,794 (266) 77%
Intensive Tree (IT) 6,719 (470) 3,863 (270) 57%
Near Complete (NC) 4,558 (319) 1,911 (133) 42%
TOTALS 20,648 13,346 (0 Mean 65X
The pre-1 oaging measurements were made by Forest Service personnel during
1973-1 974. Harvest was in the summer of 1974, and post-logging measurements were
taken in 1975-1 977.
METHODS
Locating and Describing Nest Sites
Active nest sites were located by using visual and auditory cues (flight paths to
to and from nests, sounds of excavating or drumming, vocalizations of adults near the
nest tree, and nestlings' calls from the nest cavity). Only those trees in which the
nesting sequence reached at least incubation stage were considered active, sites .
After confirmation as a active nest site (and usually after fledging so that the risk
of nest abandonment was avoided) a series of measurements was taken at the nest tree
and surrounding habitat. These included: 1 ) tree: condition (fig. 3), species, dbh,
height, % bark, lean, evidence of decay, and fire evidrnce; 2) nest hole: orienta-
tion, height from ground, surrounded by bark?, nest hol elcanopy relationship, and
number of other nest holes in tree; 3) site: slope, aspect, altitude, location on
slope, distance to water, canopy height, % canopy cover, understory description, and
basal area of surrounding forest.