Name:
Pinus engelmannii Woodland Alliance
Reference:
Western Ecology Working Group of...
Description:
This woodland alliance occurs in mountains below the Mogollon Rim in southeastern Arizona, southwestern New Mexico and northern Mexico. Sites range from cool dry-mesic to warm xeric on rocky, moderate to steep mountain slopes, benches and terraces. Aspect varies with elevation. Soils range from moderately deep alluvium to shallow, lithic colluvium and residuum. Woodlands included in this alliance are characterized by an open tree canopy, 15-25 m tall, dominated by the Madrean, evergreen needle-leaved tree Pinus engelmannii. Pinus leiophylla may codominate in seral stands, and scattered Pseudotsuga menziesii or Pinus ponderosa may be present in higher elevation stands. The subcanopy is dominated by evergreen trees, such as Quercus rugosa, Quercus emoryi, or Quercus hypoleucoides, with a mixture of small trees that may include Quercus arizonica, Juniperus deppeana, Pinus discolor, or Pinus edulis. The shrub layer is typically moderately dense to dense depending on the density of the tree canopy, and is often dominated by the same Quercus species that made up the tree subcanopy, especially Quercus hypoleucoides and Quercus rugosa. Other shrubs, like Agave parryi, Arbutus arizonica, Ceanothus fendleri, Garrya wrightii, Quercus gambelii, Quercus turbinella, Quercus toumeyi, Rhus trilobata, and Yucca schottii, may be present. Perennial graminoids are the most abundant species in the herbaceous layer, particularly Muhlenbergia longiligula, Muhlenbergia emersleyi, Panicum bulbosum, and Piptochaetium fimbriatum. Forb species may be diverse, but few species have much cover. The more common forbs include Artemisia ludoviciana, Cheilanthes fendleri, Erigeron neomexicanus, Hedeoma hyssopifolia, Hieracium fendleri, Packera neomexicana (= Senecio neomexicanus), Solidago wrightii, and Thalictrum fendleri. Diagnostic of this woodland alliance is the tree canopy dominated by Pinus engelmannii.
Accession Code:
VB.CC.18269.PINUSENGELMANNI
Plot-observations of this Community Concept:
0
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