Vegetation Classification and Mapping Project Report - USGS
Vegetation Classification and Mapping Project Report - USGS
Vegetation Classification and Mapping Project Report - USGS
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<strong>Vegetation</strong> <strong>Classification</strong> <strong>and</strong> Distribution <strong>Mapping</strong> <strong>Report</strong>: Petrified Forest National Park<br />
Distribution:<br />
Globally. This association is known only from Petrified Forest National Park in northeastern<br />
Arizona. It likely occurs elsewhere on the Colorado Plateau.<br />
Petrified Forest National Park. Purshia stansburiana - Eriogonum corymbosum Shrubl<strong>and</strong><br />
was identified from five relevés within Petrified Forest National Park. This association occurred<br />
on various l<strong>and</strong>forms, including lower slopes, midslopes, terraces, <strong>and</strong> mesas. It was<br />
located north of Pintado Point on the slopes of Headquarters Mesa, south of Tawa Point near<br />
the park road, on the northwest slopes of Pilot Rock, on top of Pilot Rock, west of Dry Wash,<br />
<strong>and</strong> west of Crystal Forest.<br />
Environmental summary:<br />
Globally. This association has only been described from Petrified Forest National Park. Until<br />
further inventory is completed, there is no global information.<br />
Petrified Forest National Park. This association occurred between the elevations of 1740<br />
<strong>and</strong> 1920 m (5700-6290 ft). Slope ranges from none to steep (0-22%, average 9%). Most of the<br />
relevés had basalt surface rocks <strong>and</strong> one had s<strong>and</strong>stone surface rocks.<br />
USFWS wetl<strong>and</strong> system: Not applicable.<br />
<strong>Vegetation</strong> description:<br />
Globally. Five relevés were classified as Purshia stansburiana - Eriogonum corymbosum<br />
Shrubl<strong>and</strong>, with total vegetation cover varying between 15 <strong>and</strong> 24% cover (average 18%). This<br />
vegetation cover consisted of a shrub stratum with 10-18% cover <strong>and</strong> an herbaceous stratum<br />
with 0.5-6% cover (average 3%). The species diversity ranged from 20 to 24 species (average<br />
22 species). The vegetation was dominated in the shrub layer by Purshia stansburiana with 0.5-<br />
5% cover (average 3%) <strong>and</strong> Eriogonum corymbosum with 0-3% cover (average 1%).<br />
Petrified Forest National Park. Only one relevé was classified as Krascheninnikovia lanata<br />
Dwarf-shrubl<strong>and</strong>, with total vegetation cover of 34%. This vegetation cover consisted of 31%<br />
cover in the shrub stratum <strong>and</strong> 3% cover in the herbaceous stratum. The species diversity was<br />
15 species. The vegetation in the shrub layer was dominated by Krascheninnikovia lanata, with<br />
30% cover.<br />
Most abundant species:<br />
Stratum Global species PEFO species<br />
Tall.shrub/sapling Purshia stansburiana Purshia stansburiana<br />
Short.shrub/ N/A Eriogonum corymbosum<br />
sapling<br />
Other noteworthy species:<br />
Global species<br />
Data are not available.<br />
PEFO species<br />
Data are not available.<br />
References:<br />
Western Ecology Working Group n.d.<br />
C46
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