. Regeneration in mixed conifer partial cuttings in the Blue Mountains of Oregon and Washington. Wheeler. Figure 1.—Location of study areas in Oregon and Washington; one or two 10-acre plots were sampled in the vicinity of each dot. Principal understory species of the mixed conifer/pinegrass community are com- mon snowberry, white spirea, pinegrass, and elk sedge. Pinegrass often develops a more or less dense sod beneath the trees. Principal understory species of the grand fir/big huckleberry community are: big huckleberry, Utah honeysuckle, piper anemone, heartleaf arnica, wood straw- berry,
. Regeneration in mixed conifer partial cuttings in the Blue Mountains of Oregon and Washington. Wheeler. Figure 1.—Location of study areas in Oregon and Washington; one or two 10-acre plots were sampled in the vicinity of each dot. Principal understory species of the mixed conifer/pinegrass community are com- mon snowberry, white spirea, pinegrass, and elk sedge. Pinegrass often develops a more or less dense sod beneath the trees. Principal understory species of the grand fir/big huckleberry community are: big huckleberry, Utah honeysuckle, piper anemone, heartleaf arnica, wood straw- berry, mountain sweet-root, and western meadowrue. Predominant soils in these plant com- munities are immature Regosols (Vitran- depts) developed in the ash layer depos- ited from Mount Mazama or Glacier Peak. These are well-drained soils with silt loam A-C horizons over older buried soils or basalt (Wade 1975). Some characteristics of the partial cuts sampled are given in table 1. In both plant communities, the residual overstory was similar in number of trees, basal area per acre, and average diameter. The major difference in the overstory between the two plant communities was species composition. In the mixed conifer pinegrass community, 22 percent of the overstory was grand fir, 20 percent Douglas-fir, 43 percent ponderosa pine, 13 percent western larch, 2 percent lodgepole pine, plus a few Engelmann spruce. In the grand fir/big huckleberry community, there was considerably more grand fir (54 percent) and Engelmann spruce (16 percent) and fewer ponderosa pine (7 percent). In 61 partial cut units, slash was piled by machine and burned; in 14 units, it was not treated. 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Seidel, Kenneth W. cn; Head, S. Conrade. cn; Pacific Northwest Forest and Range Experiment St
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