Pinyon-juniper woodland Article

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Single-leaf Pinyon- Utah Juniper woodland in northeastern Nevada near Overland Pass at the south end of the Ruby Mountains

Pinyon-juniper woodland, also spelled Piñon-juniper woodland, is a vegetation type ( biome) of Western United States higher elevation deserts, characterized by being an open forest dominated by low, bushy, evergreen junipers ( Juniperus osteosperma, [1] [2] Juniperus californica, [2] [3] Juniperus grandis [3]), pinyon pines ( Pinus monophylla, [2] [3] Pinus edulis [2]), and their associates which vary from region to region. [1] [4] [5] The woodland's crown height may vary from less than 10 meters up to 15 meters, depending on the site. [6] It may consist of pure stands of pinyon pine, or pure stands of juniper. [3]

Range

Range of Pinyon-Juniper Woodlands in the Western United States

The Pinyon-juniper woodland range spans from New Mexico, to the eastern Sierra Nevada, the Colorado Plateau, the Great Basin, and higher elevations of Mountain ranges of the Mojave Desert. [7] The woodland's range includes the Mogollon Rim in the south, to its northern extent in the Snake River Plain. [8]

Arizona and New Mexico

The Pinyon-juniper woodland is one of the most prevalent types of coniferous woodland in northern Arizona and New Mexico. [9]

Utah and Canyonlands Region

The pinyon-juniper plant community covers a large portion of Utah and the Canyonlands region. [1] singleleaf ash ( Fraxinus anomala), and Utah serviceberry ( Amelanchier utahensis) are codominants of pinyon pine and Utah juniper in this region. [1] in this region, the community occurs on rocky soils or jointed bedrock. [1]

Mojave Desert

In the steppes adjoining the Mojave Desert, this vegetation type can be found in areas receiving 12-20 inches of annual precipitation, and between 4,500 and 8,000 feet. [2] Associates include bitterbrush ( Purshia glandulosa), Apache plume( Fallugia paradoxa), desert sagebrush ( Artemisia tridentata), green ephedra ( Ephedra viridis), mountain mahoganies ( Cercocarpus spp.), and buckwheats ( Eriogonum spp.). [2] In the Mojave, pinyon-juniper woodlands are generally above the Joshua Tree Woodlands vegetation type, and requires more annual precipitation. [2] [10]

Sierra Nevada

In the eastern Sierra Nevada, the elevation range is 4,000-5,500 feet in the north, and 5,000 to 8,000 feet in the southern reaches of the range. [3] Pinyon-juniper woodland requires 12-20 inches of annual precipitation, so is generally located above the sagebrush scrub vegetation type, which can survive on an average of 7 inches per year. [3] It is located below the alpine zone. [3] There is often an understory dominated by sagebrush ( Artemisia tridentata) and its associates. [3] Co-dominants include Jeffrey Pine ( Pinus jeffreyi) and an understory of sagebrush scrub or rabbitbrush scrub ( Ericameria spp.). [3]

See also

References

  1. ^ a b c d e Damian Fagan, Canyon Country Wildflowers, p. 3
  2. ^ a b c d e f g Pam MacKay, Mojave Desert Wildflowers, p19-20
  3. ^ a b c d e f g h i Karen Wiese, Sierra Nevada Wildflowers, 2013, p. 18
  4. ^ Ronald J. Taylor, Sagebrush Country
  5. ^ Laird Blackwell, Great Basin Wildflowers, p5-6
  6. ^ "[Pinyon-juniper ecosystem]". Digital-Desert: Mojave Desert. Retrieved 1 February 2016.
  7. ^ "Pinyon-Juniper Woodlands - Introduction & Distribution (U.S. National Park Service)". www.nps.gov. Retrieved 2018-01-26.
  8. ^ Cronquist, (1972).
  9. ^ Dick-Peddie, (1999) pp. 87.
  10. ^ Adrienne Knute, Plants of the East Mojave, p31.

Sources

  • Dick-Peddie, William A. (1999). New Mexico Vegetation: Past, Present, and Future. University of New Mexico Press. p. 280. ISBN  0-8263-2164-X.
  • Cronquist, Arthur; Arthur H. Holmgren; Noel H. Holmgren; James L. Reveal; James Reveal; Noel Holmgren (1972). Intermountain Flora - Vascular Plants of the Intermountain West, U.S.A. - Geological and Botanical History of the Region, its Plant Geography and a Glossary. Vol. 1. The New York Botanical Garden Press. p. 270. ISBN  0-89327-300-7.