| Abstract: | 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. |
| Genre: | USGS Numbered Series |
| ProdID: | 97913 |
| Citation Author: | Thomas, Kathryn A.; Hunt, Randall; Arundel, Terry; Guertin, P. |
| Citation Contributing Office: | Southwest Biological Science Center |
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| Citation Edition: | - |
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| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | 0351200 |
| Citation LatS: | 0344200 |
| Citation LonE: | -1093000 |
| Citation LonW: | -1100000 |
| Citation Month: | |
| Citation No Pagination: | N |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | Report: v, 73 p.; Data Package |
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| Citation Public Comments: | |
| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 2009-1179 |
| Citation Search Results Text: | Petrified Forest National Park Invasive Plant Species Survey and Mapping; 2002-2005; 2009; OFR; 2009-1179; Thomas, Kathryn A.; Hunt, Randall; Arundel, Terry; Guertin, P. |
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| Citation Year: | 2009 |
| Type: | citation/reference |
| Text: | Petrified Forest National Park Invasive Plant Species Survey and Mapping; 2002-2005; 2009; OFR; 2009-1179; Thomas, Kathryn A.; Hunt, Randall; Arundel, Terry; Guertin, P. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/ofr_2009_1179.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/of/2009/1179/ |
| Date Other: | Thu, 8 Oct 2009 00:00 -0500 |
| Publisher: | U.S. Geological Survey |
