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U.S. Geological Survey Open-File 2009-1179

National Park Service's Intermountain Region Noxious Weed Inventory and Mapping Program

Petrified Forest National Park Invasive Plant Survey and Mapping: 2002–2005

By K.A. Thomas, R. Hunt, T. Arundel, and P. Guertin


Thumbnail of and link to report PDF (4.3 MB)

We conducted a survey for invasive nonnative plant species at Petrified Forest National Park from 2002 through 2005. The survey employed a unique sampling design consisting of a grid of consecutive one-hectare cells as the sampling units. Our use of predetermined sampling units allowed all observations to be referenced to a fixed area with geographic coordinates that easily transferred to a geographic information system. Our field team surveyed 2,730 sampling units in three select areas for at least 1 year and 879 sampling units for 4 years. During this period we identified 40 different invasive plant species; more than half the invasive plants (22 species) were annual forbs and grasses. Four invasive plant species occurred in 25 percent or more of all sampling units observed in one or more years: Bromus tectorum, Erodium cicutarium, Salsola tragus, and Sisymbrium altissimum. Salsola tragus was the most abundant species in all years and occurred in more than 55 percent of all sampling units surveyed each year.

  • Report PDF (4.3 MB)
  • Data package .zip file. This file consists of an Access database with field data and a shapefile of the sampling grid used to conduct the survey. Metadata accompany both. (; 418 kB, 13.5 MB expanded)
  • This report is available only on the Web.

For additional information contact:
SBSC Staff, Southwest Biological Science Center
U.S. Geological Survey
2255 N. Gemini Drive
Flagstaff, AZ 86001

This report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Thomas, K.A., Hunt, R., Arundel, T., and Guertin, P., 2009, Petrified Forest National Park invasive plant survey and mapping: 2002-2005: U.S. Geological Survey Open-File Report 2009-1179, 73 p.




Petrified Forest National Park





References Cited

40 Appendixes

data package

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