. Effects of timber cutting and revegetation on snow accumulation and melt in north Idaho . Natural Regeneration, unthinned, poorly stocked, dense bru 1 6 LU 4 o * CO 0 M= 1I1L 1940 '42 '44 '46 ' 48 * 50 '52 YEAR Figure 5.—Snow gains on recovery plot, south slope 66 ' 68 7 0 7 2 74 Once timber is cleared, the south slope opening presents an even more hostile environment for conserving snow. Subjected to considerable wind scouring, increased winter melting, and greater surface evaporation/sublimation, the clearing registers a smaller net increase in snow than a comparable opening
. Effects of timber cutting and revegetation on snow accumulation and melt in north Idaho . Natural Regeneration, unthinned, poorly stocked, dense bru 1 6 LU 4 o * CO 0 M= 1I1L 1940 '42 '44 '46 ' 48 * 50 '52 YEAR Figure 5.—Snow gains on recovery plot, south slope 66 ' 68 7 0 7 2 74 Once timber is cleared, the south slope opening presents an even more hostile environment for conserving snow. Subjected to considerable wind scouring, increased winter melting, and greater surface evaporation/sublimation, the clearing registers a smaller net increase in snow than a comparable opening on a north slope. Climatic and Vegetative-Recovery Trends On the north slope a greater depth of snow was measured in the recovery plot during the 1942 to 1952 period than in the interval from 1967 to 1974 (fig. 6). The levels or intercepts of the two regressions are significantly different (P<=). This may be interpreted as a time-dependent decrease in snow gains. The curves lie well above the "100 percent recovery" line, a theoretical point in time when the structure of the timber on the recovery plot approximates that of the surrounding forest. The apparent downward trend was tested by adjusting for year-to-year variations in winter precipitation and mean winter temperature (measured at headquarters station). Results of the test after including a time-trend variable are presented in table 3. 8
Size: 3007px × 1662px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1900, bookcollectionbiodiversity, booksubjectsnow
