Cline, R: Potential Water Yield Response Following Clearcut

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Cline, R: Potential Water Yield Response Following Clearcut

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Excerpt from Potential Water Yield Response Following Clearcut Harvesting on North and South Slopes in Northern Idaho

The hydrologic response of small clearcuts on north and south slopes in northern Idaho was investigated. On the north slope, substantial gains (27 to 35 cm) in potential water yield per year resulted from (a) removal of transpiring surfaces associated with plant cover, (b) elimination of snow interception by a closed - canopied forest, and (c) gradual reoccupation of the soil mantle by invading herbaceous Species. On the south slope, small to moderate gains (4 to 11 cm) in yield resulted from clearcutting, at least in 1973, the year studied. In earlier years, the gains probably would have been negligible. Site factors that compensated for clearcut'ting kept gains in yield small to moderate on the south slope. Initial forest losses from interception were light because of the open-canopied structure of the tim ber and windiness at treetop level. In the clearcut, water gains from reduced transpiration were more than used up within 4 years by invading shrub Species. The south Slope clearcut was subjected to other sources of water loss also.

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