. Natural regeneration of Douglas-fir and associated species using modified clear-cutting systems in the Oregon Cascades. Forest regeneration Oregon; Douglas fir Oregon; Clearcutting Oregon; Forest regeneration Cascade Range; Douglas fir Cascade Range; Clearcutting Cascade Range. Patch Clear Cuts Stocking of patch clear cuts was generally intermediate between the east- west and north-south strip clear cuts. As a group, the patch clear cuts showed a consistent relationship between shade and number of Douglas-fir seedlings per plot. Two exceptions were units G2 and G5. Part of unit G2 was a low
. Natural regeneration of Douglas-fir and associated species using modified clear-cutting systems in the Oregon Cascades. Forest regeneration Oregon; Douglas fir Oregon; Clearcutting Oregon; Forest regeneration Cascade Range; Douglas fir Cascade Range; Clearcutting Cascade Range. Patch Clear Cuts Stocking of patch clear cuts was generally intermediate between the east- west and north-south strip clear cuts. As a group, the patch clear cuts showed a consistent relationship between shade and number of Douglas-fir seedlings per plot. Two exceptions were units G2 and G5. Part of unit G2 was a low swampy- area which offered little mineral seedbed. More than half of the stocked plots contained western hemlock and/or western redcedar; and 29 percent of the plots were stocked with Douglas-fir. Unit G5 had a road as its southern boundary and the effective environment of this clear cut was larger than its half-acre size would indicate. In addition, a second unit just across the road from G5 was cut in the spring of 1959. This disturbance made it impossible to obtain a valid estimate of amount of shading during the previous 4 years. Most references to strip and patch clear cutting list the main advantage as a provision for an effective seed source (Haig et al. , 1941; Hawley and Smith, 1954; Heinselman, 1959; Lexen, 1949). Hawley and Smith (1954) mention in addition that ". .this kind of modification /"strips or patchesj may also be em- ployed. ..to create an environmental condition intermediate between the protection of a shelterwood and the drastic exposure of a large clear cut area. " Troup (1952) emphasizes the protective function of such cuttings. A system known as Wagner's "Blendersaumschlag" involves narrow strip cuttings oriented east and west which progress from north to south with the specific objective of protecting seedlings from the sun on the strip being regenerated. In European clear-strip systems, cuttings are often restricted to widths
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