Effects of Defoliation by Douglas-Fir Tussock Moth on Timing and Quantity of Streamflow

摘要

Streamflow data from three watersheds in the Blue Mountains of Oregon were tested for changes in annual runoff, summer runoff, and peak discharge following the defoliation in 1972 and 1973 caused by the Douglas-fir tussock moth. Annual runoff from the Umatilla River watershed in 1974 was 13.2 cm greater than the predicted value and 2.5 cm greater than the end point 95-percent confidence band for the baseline data.