Graduate Thesis Or Dissertation
 

Performance of planted seedlings in shelterwoods near Prospect, Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qb98mk61s

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  • A survey of partial cuts planted with bare-root seedlings, was conducted on the Prospect Ranger District, Rogue River National Forest, Oregon, during the 1977 summer season. The purpose was to assess stocking and its composition under present levels of canopy cover, and to determine relationships between canopy density and performance of planted seedlings. Thirteen plots were established in mixed conifer partial cuts, and five were located in true fir partial cuts. Four-milacre (.00162 ha) subplots were systematically located along equally spaced grid lines to sample stocking and several environmental factors. Larger subplots, i/s acre (.08094 ha) in area, were superimposed over 12 four-milacre subplots in each plot to measure overstory canopy and seedling height growth. Total stocking averaged 77 and 88 percent, respectively, for the Mixed Conifer and True Fir Zones. Increases in total stocking were associated with increases in elevation, Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco.) was the main stocking component on site prepared areas in the Mixed Conifer Zone; Shasta red fir (Abies magnifica Murr. var. shastensis Lemm.) was the predominant species in the True Fir Zone. Mean canopy densities varied little among partial cuts, but large local variations in canopy density occurred within plots. Small openings are just as likely to be stocked with planted seedlings as surrounding areas under canopy. Two-year height growth was very slow in both forest zones, and was not generally correlated with canopy density. However, three-year height growth of Douglas-fir was negatively correlated with canopy density in the Mixed Conifer Zone. Frost damage was observed on Douglas-fir in several clearcuts, but in only one partial cut. No frost damage was found on sample trees in shelterwoods with an average canopy density greater than 35 percent. On pumice flats, seedlings planted under canopies with less than 15 percent cover are likely to suffer frost damage. Silvicul,tural implications and applications of study results in intensive forest management are discussed.
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