Regeneration in Mixed Conifer and Douglas-Fir Shelterwood Cuttings in the Cascade Range of Washington

摘要

A survey of shelterwood cuttings in mixed conifer and Douglas-fir (Pseudotsuga Menziesii) forests in the Cascade Range in Washington showed that on the average. Shelterwood units were adequately stocked with a mixture of advance, natural postharvest, and planted reproduction of a number of species. Shelterwood cuttings in the Douglas-fir type had abundant regeneration, whereas those in the mixed conifer type had generally adequate stocking but fewer seedlings. Much of the understocking appeared to be related to a non-uniform overstory, lack of advance reproduction, or high elevation.