. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. breakage. At the west end of the gorge, trees typically lack branches on the easterly sides of the stem. This deformation is the result of branch breakage during the severe ice storms and destruction of buds and branches by dry east winds. Another interesting ecological feature of the gorge is the opportunity it provides to study the transition from xerophytic Pinus ponderosa-Quercus garryana forests on the east to the mesophytic Pseudotsuga menziesii- Tsuga heterophylla types on the west. Troll (1
. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. breakage. At the west end of the gorge, trees typically lack branches on the easterly sides of the stem. This deformation is the result of branch breakage during the severe ice storms and destruction of buds and branches by dry east winds. Another interesting ecological feature of the gorge is the opportunity it provides to study the transition from xerophytic Pinus ponderosa-Quercus garryana forests on the east to the mesophytic Pseudotsuga menziesii- Tsuga heterophylla types on the west. Troll (1955) has provided an interesting vegetation profile (fig. 157) indicating the distribution and interdigitation of the various zones through this area. Figure 157. — Vegetation profile through the Columbia Gorge and Cascade Range (from Troll 1955). Willamette — Puget Trough Cascade Range Mt. Rainier 4392 m 4000 m -3000 m - 2000 m 1000 m t. Adams Mt. St. Helens 2948 m Silver-Star Mt. Columbia Plateau Portland | Wind Mt. Cascade Locks Hood River Lyle. The Dalles Columbia Gorge 0 10 20' 30 40 50 km Forests of Pseudotsuga menziesii with Tsuga heterophylla and Thuja plicata |V3 Forests of Pinus ponderosa and Quercus garryana Prairie (bunchgrass steppe of Agropyron spicatum) MM Forests of Abies amabilis, A. procera, Pinus monticola, Tsuga heterophylla, and Chamae- cyparis nootkatensis Forests of Pinus contorta, P. ponderosa, P. monticola, Larix occidentalis, Pseudotsuga menziesii, and Abies grandis Hi Subalpine forests of Abies lasiocarpa, Tsuga mertensiana, and Pinus albicaulis H Alpine communities I I Snowfields and glaciers 181. 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 Franklin, Jerry F. cn; Dyrness, C. T. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agricultur
Size: 2684px × 931px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, bookleafnumber193
