Supressed Grand Fir and Shasta Red Fir Respond Well to Release

摘要

The 5-year growth response of a 43-year-old, suppressed, even-aged grand fir-Shasta red fir stand of advance reproduction was measured in central Oregon after release and thinning. Both diameter and height growth of the seedlings and saplings responded immediately after competition of the lodgepole pine over-story was eliminated--the growth rate increasing two to three times above the 5-year pre-release rate. Spacing treatments had no differential effect on growth response of the fir understory both species responded similarly except for a greater number of epicormic branches on grand fir.