. Effects of timber cutting and revegetation on snow accumulation and melt in north Idaho. Clearcutting Idaho; Snow; Revegetation Idaho. The structure of timber on the forest control plot was assumed to have changed over the 34-year evaluation period. To test this assumption, a time-trend analysis was performed, including climatic data recorded at the PREF headquarters station (elevation 2,380 ft [725 m]). Data for the vegetative recovery plot were similarly analyzed to determine if vegetation had recovered enough to have affected snow accumulation and melt. In other tests, water-equivalent ch
. Effects of timber cutting and revegetation on snow accumulation and melt in north Idaho. Clearcutting Idaho; Snow; Revegetation Idaho. The structure of timber on the forest control plot was assumed to have changed over the 34-year evaluation period. To test this assumption, a time-trend analysis was performed, including climatic data recorded at the PREF headquarters station (elevation 2,380 ft [725 m]). Data for the vegetative recovery plot were similarly analyzed to determine if vegetation had recovered enough to have affected snow accumulation and melt. In other tests, water-equivalent changes in the snowpack over time were compared using regression techniques. PEAK SNOW ACCUMULATION Harvesting Effect On the north slope, the removal of the young mature timber resulted in average snow gains in the vegetative recovery plot of in ( cm) for the period 1942 through 1952 (table 2). This was the period of early stand reestablishment and develop- ment (fig. 2). The average yearly gains compare favorably with those of in ( cm) measured in a narrower strip (200 ft [61 m]) cut in mature-overmature cedar-hemlcck- white pine 1,000 ft (305 m) higher in elevation (Haupt, in press). Most of the snow accumulation increase was the result of snow caught in dense canopies that would have evaporated/sublimated had the trees not been harvested. Another portion of the increase was probably the result of wind eddy-forest edge effect during storms, and a fractional increase was perhaps due to slower winter release of water from the snowpack in the opening compared with the forest (Haupt 1972, in press). Gains on the recovery plot are shown in figure 4. Figure 3.—Aerial view of strip olearcut taken May 1966 (arrows denote study plots). A. North-facing slope before thinning. B. South-facing slope. 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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