Name:
Quercus douglasii Woodland Alliance
Reference:
Western Ecology Working Group of...
Description:
This woodland alliance of northern and central California occurs in savannas and foothills between 30 and 1700 m of elevation. Stands grow on shallow, infertile soils that are moderately to excessively drained. Many rock fragments are in the soil, and the soil surface is often covered with stones and rock outcrops. The climatic regime where this alliance grows is strongly Mediterranean with warm, dry summers, and cool, moist winters. Most precipitation falls as rain between November and April. Yearly rainfall totals average about 100 cm. This is one of the most floristically diverse of the oak woodlands. Many associations have been defined within the alliance. Also, stands dominated by Quercus X alvordiana are included. Typical stands contain Quercus douglasii as an important or dominant species in the tree canopy. The canopy may be two-tiered. Other trees that may be present include Quercus agrifolia, Quercus wislizeni, Juniperus occidentalis var. occidentalis, and Pinus sabiniana. Shrubs are infrequent to common, and composition of the shrub layer is highly variable. Shrubs present may include Lupinus concinnus, Cercocarpus montanus var. glaber, Delphinium parryi, Collinsia sparsiflora, Bowlesia incana, Phacelia imbricata, Plantago erecta, Lotus wrangelianus, Amsinckia menziesii var. intermedia (= Amsinckia intermedia), Pentagramma triangularis, Ribes californicum, Ericameria linearifolia, Viola pedunculata, Lithophragma cymbalaria, Galium andrewsii, Rigiopappus leptocladus, Plagiobothrys nothofulvus, Trifolium ciliolatum, Eriogonum elongatum, Euphorbia spathulata, Ceanothus cuneatus, Arctostaphylos viscida, Erodium moschatum, and Lithophragma affine. The ground is covered with graminoids and can include Hordeum murinum ssp. leporinum (= Hordeum leporinum), Achnatherum lemmonii (= Stipa lemmonii), Nassella pulchra (= Stipa pulchra), and Bromus diandrus.
Accession Code:
VB.CC.19765.QUERCUSDOUGLASI
Plot-observations of this Community Concept:
0
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