. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. where it may join Libocedrus decurrens in maintaining self-perpetuating populations. Abies concolor (or A. grandis) appears to be the major climax species within the Mixed- Conifer Zone; it is the most tolerant species normally present and dominates the conifer reproduction (fig. 82). Unfortunately, we cannot outline further the diversity of forest and other communities found within the Mixed-Conifer Zone due to lack of data. Future research will doubtless illustrate the varied and complex plant co
. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. where it may join Libocedrus decurrens in maintaining self-perpetuating populations. Abies concolor (or A. grandis) appears to be the major climax species within the Mixed- Conifer Zone; it is the most tolerant species normally present and dominates the conifer reproduction (fig. 82). Unfortunately, we cannot outline further the diversity of forest and other communities found within the Mixed-Conifer Zone due to lack of data. Future research will doubtless illustrate the varied and complex plant com- munities within this zone. Figure 88. — Abies concolor forests are especially ex- tensive and well developed along the southern and southwestern flanks of the Oregon Cascade Range; this pureAfr/es concolor forest is typical of those found near Mount McLoughlin (Rogue River National Forest, Oregon).. "ABIES CONCOLOR" ZONE Forests dominated by Abies concolor are the major feature of the Abies concolor Zone. This zone grades into the Mixed-Conifer and Abies magnifica shastensis Zones at its lower and upper limits, respectively. It occupies a relatively narrow elevational band, occurring at about 1,400 to 1,600 meters in the Cascade Range and 1,650 to 1,800 meters and 1,400 to 1,800 meters in the eastern and western Siskiyou Mountains, respectively (Waring 1969; Whittaker 1960). However, around Lake of the Woods and along the southwest- ern flank of the southern Oregon Cascade Range, there are extensive tracts at the appro- priate elevations, and consequently, Abies concolor forests are widespread and well de- veloped there (fig. 88). The Abies concolor Zone of southwestern Oregon extends around the southern end of the Cascade Range into southeastern Oregon, an area discussed later. It correlates with the "White Fir Phase" of the Mixed-Conifer Forest in northern Califor- nia (Griffin 1967) and is considered an ele- ment of Merriam's Canadian Life Zone (Den-
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