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Appendices to GPRO Adaptive Restoration Plan
Contents: Appendix 1: Plant list Appendix 2: Elevation maps Appendix 3: Vegetation sample-points map Appendix 4: Target species presence/absence maps Appendix 5: Undesirable species presence/absence maps Appendix 6: Selected species abundance maps
Appendix 1: Plant list for all taxa encountered in GPNM meadow, compiled by Deb Pomroy, summer 2009.
Map of elevation classes based on a natural-neighbors interpolation from the points shown, performed with ArcMap GIS software. Elevation classes were forced into the same breaks used in Figure 1 of Part 2 (main report file) but here the vertical precision of each point is shown with data labels.
Elevation (m) shown as a continuous surface; again, based on natural-neighbors interpolation from the points shown, performed with ArcMap GIS software.
Appendix 3: Vegetation sample-points map
Vegetation sample-points from the summer 2009 survey, with their GPS point name as data labels.
Sweetgrass (Hierochloe hirta = odorata) was rarely sampled, but also occurred sporadically outside sampling plots near 15, 115 and 15, 125 and along the road just south of the site.
Sunchoke (Jeruselum artichoke; Helianthus tuberosa) was rare. The more substantial patch occurred at the 105, 25 location marked in the lower left above.
Caraway (Carum carvi) was widespread, suggesting no need for assisted restoration.
Greene’s rush (Juncus greenei) was fairly infrequent but was abundant in the northern, higher-elevation portion of the site.
Green bulrush (Scirpus atrovirens) overlapped with sweetgrass twice within our plots, but the bulrush was almost exclusively present in and around the same area where sweetgrass was present. Therefore we suspect bulrush and sweet grass either thrives in the same conditions (open canopy areas with sandy soils and groundwater influence) or they facilitate one another.
Cow vetch (Vicia cracca) was less frequent than its native counterpart, American vetch (Vicia americana) and generally less abundant. But in a few places (such as plot 95, 15) its cover was extraordinarily high, suggesting invasive potential.
Reed canary grass (Phalaris arundinacea) was very infrequent. There was also a patch near the parking lot east of the site. Eradicating this invasive species now would be prudent, since restoration activities may expose bare soil and invite invasion.
Canada thistle (Cirsium arvense) was infrequently sampled but often occurred outside of our plots in the southern portion of the site.
Smooth brome (Bromus inermus) was frequent along the edges and southern portions of the site.
Appendix 6: Selected species abundance maps.
Smooth brome (Bromus inermus) appeared to be more abundant at the edges of the site.
Bird’s foot trefoil (Lotus corniculatus) appeared to be concentrated between a wooded patch in the middle portion of the site and the highest elevation portion of the site.
Two shrubs, willows (Salix sp., left) and redosier dogwood (Cornus sericea, right) were abundant along forest edges within the site.
Two high-frequency species, tall field buttercup (Ranunculus acris, left) and smooth rose (Rosa blanda, right) showed little variation in their abundance. But rose was conspicuously absent from the highest elevation portion of the site.
Horsetail (Equisetum arvense, left), appeared to be more abundant within the higher-elevation portion of the site, whereas grasses (Poaceae, right), which are generally drought tolerant, appeared to be more abundant at the lower-elevation portion of the site. This suggests an elevation-independent moisture gradient, such as groundwater seepage, but similar patterns could be caused by biotic or edaphic factors. Notably, horsetail occurred in all four plots where sweetgrass occurred.