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Ground-Based Forest Harvesting Effects on Soil Physical Properties and Douglas-Fir Growth

^a Weyerhaeuser Co., 2730 Pacific Blvd. Albany, OR 97322
^b Weyerhaeuser Co., 505 N. Pearl, Centralia, WA 98531
^c USDA Forest Service, Pacific Northwest Research Station, Olympia Forestry Sciences Laboratory, 3625 93^rd Avenue SW, Olympia, WA 98512
^d ENSR International, 9521 Willows Rd. NE, Redmond, WA 98052

View larger version (177K): [in a new window]   Fig. 1. Location of the Fall River study area in coastal Washington, USA.

View larger version (24K): [in a new window]   Fig. 2. Area in each disturbance class and proportion of tree seedlings planted on each disturbance class at Fall River. Class 0 = No soil disturbance, Class 1 = Soil compaction preserving topsoil structure, Class 2 = Soil compaction altering topsoil structure, Class 6 = Presence of berms of soil and slash. Values are means ± one standard error.

View larger version (27K): [in a new window]   Fig. 3. Soil strength by soil disturbance class and tilled soil 14 to 17 mo after forest harvest at Fall River. Values are means with standard errors indicated for some depths. Class 0 = No soil disturbance, Class 1 = Soil compaction preserving topsoil structure, Class 2 = Soil compaction altering topsoil structure.

View larger version (26K): [in a new window]   Fig. 4. Water retention curves for non-compacted, compacted, and compacted and tilled soil at the (a) 0- to 10-cm, and (b) the 10- to 20-cm depth at Fall River. Values are means ± one standard error.

View larger version (22K): [in a new window]   Fig. 5. Volumetric soil water content during 2001 and 2002 at Fall River for DC2 compacted and DC0 non-compacted areas. Values are means ± one standard error.