. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. Figure 63. — Pure, old-growth stands of Tsuga mer- tensiana are common throughout the Tsuga mertensiana Zone; note the clumping tendency of the trees in this stand near timberline (Gifford Pinchot National Forest, Washington). the zone (fig. 63), and Abies lasiocarpa or Pinus contorta, or both, in serai stands in drier portions of the zone. Abies amabilis is conspicuous in the zone in Washington and northern Oregon, but it drops out completely in the southern Oregon High Cascades. There are a wide
Image details
Contributor:
Book Worm / Alamy Stock PhotoImage ID:
RFCMCXFile size:
7.1 MB (532.5 KB Compressed download)Releases:
Model - no | Property - noDo I need a release?Dimensions:
1197 x 2087 px | 20.3 x 35.3 cm | 8 x 13.9 inches | 150dpiMore information:
This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.
This image could have imperfections as it’s either historical or reportage.
. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. Figure 63. — Pure, old-growth stands of Tsuga mer- tensiana are common throughout the Tsuga mertensiana Zone; note the clumping tendency of the trees in this stand near timberline (Gifford Pinchot National Forest, Washington). the zone (fig. 63), and Abies lasiocarpa or Pinus contorta, or both, in serai stands in drier portions of the zone. Abies amabilis is conspicuous in the zone in Washington and northern Oregon, but it drops out completely in the southern Oregon High Cascades. There are a wide variety of understory species of which many are Ericaceae, Rosaceae, and Compositae. The spectrum of communities found with- in the Tsuga mertensiana Zone varies locally with gradients in temperature, moisture, and accumulation and duration of snow, as well as geographically. In southern Washington the Tsuga mertensiana-Abies amabilis/Vaccinium membranaceum community is typical of modal sites. It has a depauperate understory composed of Vaccinium membranaceum, Xerophyllum tenax, Pyrola secunda, Rubus lasiococcus, and perhaps a few additional spe- cies. A variant of this community, in which the understory is completely dominated by a dense cover of Xerophyllum tenax, is com- mon in the southern Washington and northern Oregon Cascade Range (fig. 64). On wetter, cooler habitats, e.g., north slopes and along drainages, communities have dense shrub understories 1 to 1-1/2 meters in height. The most extreme example in south- ern Washington is a Chamaecyparis nootka- tensis/Rhododendron albiflorum/Gley Podzol association (Franklin 1966). A tangle of Vac- cinium ovalifolium, V. membranaceum, Rho- dodendron albiflorum, Menziesia ferruginea, and Sorbus spp. is characteristic of this shrub layer. Typical herbs include Rubus pedatus, R. lasiococcus, Valeriana sitchensis, Viola sempervirens, Listera caurina, and Erythroni- um montanum. In southern Oregon, the extensive Tsuga mertensiana c