Inventory and Survey Methods for Nonindigenous Plant Species (PDF)

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Chapter 3 • Landscape-Scale Wildland Inventoriesq Figure 2. Daily inventory routes of each crew member were recorded and mapped within the project area (black line) using thebetween feature points (BFP, black points) tracking function of the GeoExplorer GPS units. Here BFP were taken every 500 ft (152m) to show that a surveyor had been in an area even if no NIS locations were recorded.maintain confidence that at least 90% of all infestations oftarget species 0.01 acre or larger within the entire inventoryarea were detected. Search swath widths were adjusted asneeded according to variations in terrain, walking speed,associated vegetation, and target species. In heavy cover and/or for difficult-to-see species, swath widths were as narrowas 25 yards. In very open terrain and/or for highly visiblespecies such as salt cedar (Tamarix ramosissima), some effectiveEDSWs were 100 yards or greater. Inventorying steepterrain using the EDSW method was not always possible,so in that case crew members used binoculars to visuallyscan the open but inaccessible hillsides for suspected targetspecies. Binoculars were also used to search flats and washbottoms for target species in any openings surrounded byimpenetrable woody vegetation.Each inventoried area was assigned a detection confidencevalue based on the crew’s estimated ability to see 0.01-acreand larger infestations of the least visible target species,taking into account terrain, vegetation cover, and the sizeand growth stage of the targeted plant species. Detectionconfidence was broken into three categories: low (1 to 50%),medium (51 to 89%), and high (90 to 100%).Locations of all target species were documented usingGPS units with 2 to 5 m accuracy (Figure 3). Crews alsorecorded the location and documented the identity of anyother nontarget species they encountered if that NIS had aknown history of invasiveness in other regions in the West.The crew recorded the occurrence of target species on a hardcopy map (U.S. Geological Survey 7.5-minute topographicalmaps) in any situation where GPS satellite reception was notpossible (such as in narrow side canyons) or in cases of GPSequipment malfunction.28Inventory and Survey Methods for Nonindigenous Plant Species
Chapter 3 • Landscape-Scale Wildland Inventoriesq Figure 3. Locations of all target species within the area inventoried were documented with GPS units. This example is fromLost Spring Canyon, Arches National Park (Dewey et al. 2005d).Inventory and Survey Methods for Nonindigenous Plant Species29
Page 1: Inventory andSurvey Methodsfor Noni
Page 4 and 5: Inventory andSurvey Methodsfor Noni
Page 6: IntroductionLisa J. Rew, Steven R.
Page 9 and 10: Chapter 6..........................
Page 11 and 12: Chapter 1 • Getting StartedCertai
Page 13 and 14: Chapter 1 • Getting Started• Wh
Page 15 and 16: Chapter 1 • Getting StartedThere
Page 17 and 18: Chapter 1 • Getting Startedwill g
Page 19 and 20: Chapter 2Data ManagementMandy TuInt
Page 21 and 22: Chapter 2 • Data ManagementIn con
Page 23 and 24: Chapter 2 • Data ManagementRefere
Page 25 and 26: Chapter 3 • Landscape-Scale Wildl
Page 29: Chapter 3 • Landscape-Scale Wildl
Page 35 and 36: Chapter 4Digital Aerial Sketch-Mapp
Page 37 and 38: Chapter 4 • Digital Aerial Sketch
Page 45 and 46: Chapter 5 • Tiered Sampling Metho
Page 51 and 52: Chapter 6Stratified Random Sampling
Page 53 and 54: Chapter 6 • Stratified Random Sam
Page 59 and 60: Chapter 7 • Adaptive Sampling Des
Page 61 and 62: Chapter 7 • Adaptive Sampling Des
Page 63 and 64: Chapter 8 • Remote Sensing for De
Page 65 and 66: Chapter 8 • Remote Sensing for De
Page 67 and 68: Chapter 9Coarse-Scale Mapping:The S
Page 69 and 70: Chapter 9 • Coarse-Scale Mapping:
Page 71 and 72: Chapter 9 • Coarse-Scale Mapping:
Page 73 and 74: Chapter 10 • Beyond Inventory/Sur
Page 75 and 76: Chapter 10 • Beyond Inventory/Sur
Page 77: ContributorsContributorsKimberley A

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