Effects of defoliation by Douglas-fir tussock moth on timing and quantity of streamflow
J. D. Helvey, Arthur R. Tiedemann, Pacific Northwest Forest and Range Experiment Station (Portland, Or.), United States. Forest Service
Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1978 - Nature - 13 pages
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110 Annual runoff 2.5 cm greater 95-percent confidence band annual precipitation annual runoff increase beside each solid Bethlahmy Blue Mountains calibration cm per unit compared to annual concluded that runoff confidence limits defoliation began defoliation in l973 defoliation on runoff deforested effect of defoliation elevation Engelmann spruce Fork of Walla Fork Walla Walla Freese l967 heavy mortality Helvey increase in l974 indicated insect outbreaks killing in l973 l0 percent l3.2 cm greater Light defoliation lower slopes Mill Creek cm mortality in l972 North Fork Walla number beside Oregon partially defoliated peak discharge potential evapotranspiration predicted value regression analysis Runoff changes caused runoff data runoff from Mill runoff in l974 scatter diagram snowmelt soil moisture storage soil profile solid dot South Fork study area top killing U.S. Geological Survey Umatilla drainage Umatilla River upper end point upper slopes vegetation reduction Walla River Basin Walla River compared Walla Walla River Washington