Vegetation Classification and Mapping Project Report - USGS

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Identification and Classification of Plant Communities Figure 3. Location of 149 classification relevés at Petrified Forest National Park observed in 2003. classification of objects—for each of the four groupings. Cluster analysis produces a dendrogram with relevés clustered at different levels. To choose “stopping points” in the cluster analysis dendrogram, the team used indicator species analysis (ISA) scores, which can identify species that characterize a group of relevés (Dufrêne and Legendre 1997; McCune and Grace 2002). The team used a method described by McCune and Grace (2002) to maximize the effectiveness of ISA scores as a means of identifying natural relevé clusters within the dendrogram. Based on the assumption that indicator scores peak at an intermediate level of clustering, they used the change in the number of significant indicators as the criterion for identifying relevé clusters. The team calculated ISA scores and p-values for each successive level of the cluster analysis, and plotted the number of significant indicators against the number of clusters at each level of the dendrogram (Decker and Coles 2003), as illustrated in Figure 5 for the shrubland class. This was done for each class to generate a graphic that the team could use to evaluate and choose the optimum levels indicating natural relevé clusters. The stopping point for each cluster was interpreted as the 15
Axis 3 Axis 2 Vegetation Classification and Distribution Mapping Report: Petrified Forest National Park Steppe Shrubland Physiognomic Class Shrubland Herbaceous Sparse Steppe Axis 1 Herbaceous Sparse Herbaceous Physiognomic Class Shrubland Herbaceous Sparse Steppe Steppe Axis 1 Shrubland Sparse Figure 4. Non-metric Multi-dimensional Scaling (NMS) ordination of 149 classification relevés collected in 2003 shows the relevés highly clustered by their physiognomic class on both axes 1 and 3, and axes 1 and 2. 16
Page 1 and 2: National Park Service U.S. Departme
Page 3 and 4: Vegetation Classification and Distr
Page 5 and 6: The National Park Service, Natural
Page 10 and 11: Acronyms and Abbreviations AA ac AP
Page 12 and 13: Executive Summary The classificatio
Page 14: Acknowledgments Behind the authors
Page 29: Vegetation Classification and Distr
Page 35 and 36: 20 Table 5. continued Plant communi
Page 55 and 56: 40 Table 13. Base map class summary
Page 61 and 62: 46 Table 16. Summary statistics for
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Page 75 and 76: Literature Cited ties: Terrestrial
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Vegetation Classification and Distr
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B2 Appendix B Plant Community 2003
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B4 Appendix B .continued Plant Comm
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Appendix C: Global and local plant
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Appendix C: Global and Local Plant
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Appendix D Plant species list The s
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D3 Appendix D continued Scientific
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Appendix E Plant community and map
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Appendix E: Plant community and map
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Appendix F Plant community and map
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F3 Appendix F continued Plant commu
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Appendix F continued Plant communit
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G4 B1 Cottonwood / Rubber Rabbitbru
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G6 B3 Blue Sage Dwarf-Shrubland Fig
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G8 B5 Copperweed - Alkali Sacaton S
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G10 B7 Drummond Goldenweed - Gallet
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G12 B9 Greasewood / New Mexico Salt
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G14 B11 Iodine Bush Shrubland Figur
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G16 B13 Sandsage Colorado Plateau S
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G18 B15 Tamarisk Shrubland Figure.G
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G20 B17 Winter-fat / Blue Grama Dwa
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G22 B19 Alkali Sacaton - Blue Grama
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G24 B21 Blue Grama Herbaceous Veget
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G26 B23 Galleta - Alkali Sacaton He
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G28 B25 New Mexico Saltbush / Alkal
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G30 B27 Russian Thistle Sand Dune V
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G32 B29 Arizona Siltbush Sparse Veg
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G34 B31 Slender Buckwheat Sparse Ve
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G36 B33 Airstrip Figure.G65..Photos
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G38 B35 Barren Wash Figure.G68..Gro
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G40 B37 Park Sites Figure.G71..Phot
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G42 B39 Residences Figure.G73..Phot
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G44 B41 Run-off Control Feature Fig
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G46 B43 Stock Ponds Figure.G77..Pho
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G48 B45 Vegetated Wash Complex Figu
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Appendix H: Accuracy Assessment Dat
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Table H-4. Contingency table: Manag
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The Department of the Interior prot
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Vegetation Classification and Mapping Project Report - USGS

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