First-year performance of 1-0 containerized Douglas-fir seedlings on droughty sites in southwestern Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/technical_reports/37720d99q

The effects of artificial shading and aspect on the performance of 1-0 container-grown Douglas-fir seedlings were evaluated 1 year after outplanting on four different aspects in southwest Oregon. The test areas, all characterized by steep slopes and shallow, skeletal soils with a surface mantle of loose rock and logging slash, have histories of repeated reforestation failure. Seedling survival was greatest on north and south slopes. Shadecards improved survival by 16 percent on the south slope and significantly increased height growth on the west slope. Artificial shading on east and west aspects produced seedlings with significantly smaller diameters than those without shading. Shadecards are recommended for south and west aspects with skeletal soils. Surface movement of debris and rock may be a significant factor in seedling survival during the first year. Protecting seedlings from animal damage and downslope movement of materials with Vexar tubes is recommended for sites where both problems exist.

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