. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. Figure 54. — Chamaecyparis lawsoniana is found in the southern part of the Tsuga hetero- phylla Zone and attains optimal devel- opment there; note the dense under- story of evergreen shrubs (Siskiyou Na- tional Forest, Oregon). Selaginella wallacei, Xerophyllum tenax, Synthyris reniformis, Rhacomitrium canes- cens var. ericoides, Aira caryophyllea, and Ceanothus sanguineus. Acer circinatum- dominated talus communities may be found well into the Abies amabilis Zone and be in- tergraded with the Ainu
. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. Figure 54. — Chamaecyparis lawsoniana is found in the southern part of the Tsuga hetero- phylla Zone and attains optimal devel- opment there; note the dense under- story of evergreen shrubs (Siskiyou Na- tional Forest, Oregon). Selaginella wallacei, Xerophyllum tenax, Synthyris reniformis, Rhacomitrium canes- cens var. ericoides, Aira caryophyllea, and Ceanothus sanguineus. Acer circinatum- dominated talus communities may be found well into the Abies amabilis Zone and be in- tergraded with the Ainus sinuata communities described later in this paper. Talus communities dominated by Acer macrophyllum occur in the Oregon Coast. Figure 55. — Old-growth Chamaecyparis lawsoniana are quite fire resistant, and vigorous specimens frequently have deep basal fire scars (Coquille River Falls Research Natural Area, Siskiyou National Forest, Oregon). Ranges (Bailey and Poulton 1968). Similar communities have been noted in northern Washington (fig. 53). Port-Orf ord-cedar variant — Near its southern edge in the Oregon Coast Ranges, Chamaecyparis lawsoniana is added to Tsuga heterophylla Zone forests. In these forests, Chamaecyparis is associated with species such as Pseudotsuga menziesii, Tsuga heterophylla, Abies grandis, Thuja plicata (only on wetter sites), Lithocarpus densiflorus, Rhododen- dron macrophyllum, Arbutus menziesii, and Pinus lambertiana (fig. 54). It appears to have the same ecological role as Pseudotsuga men- ziesii, a long-lived but serai dominant. Old- growth specimens of Chamaecyparis lawsoni- ana develop thick bark and are quite resistant to fire. Old but vigorous specimens frequently have numerous fire scars (fig. 55). Structural analyses of old-growth stands indicate it is not capable of reproducing under closed forest conditions and is replaced by more tolerant associates — Abies grandis and Tsuga hetero- Chamaecyparis lawsoniana is considered i
Size: 1774px × 1409px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
