The cover of forbs
(df = 2,H = 10.44, P < 0.01), shrubs (df = 2, H = 20.17, P < 0.01), and graminoids (df = 2, H = 10.11, P < 0.01) varied between each habitat type.
Seasonal fires, bison grazing and the tallgrass prairie forb
Arnoglossum plantagineum Raf.
Annual and perennial forb
productivity and vegetative cover fluctuated throughout the sampling period, especially at the Chandler site (data not shown).
Within vegetation quadrats, species richness, height, percent grass, forbs
, woody, and bare ground were examined.
The vegetation of the High Andean Province includes a mosaic of grasses, shrubs and forbs
of extremely limited cover.
Fecal analysis was not able to identify forbs
, willow, or shrubs to the species level, but identified all major genera (> 1%) identified by direct observations with the exception of quaking aspen (1.1%, Table 4).
The effects of management on birds often are evaluated by relating measures of bird abundance and reproductive success to features of the vegetation, such as vegetation height, vegetation density, litter depth, and percentage cover of shrubs, forbs
, and bare ground.
Generally, this area was regarded as being a part of the tallgrass prairie due to the predominance of tallgrass prairie grasses and forbs
(Transeau 1935; Thompson 1975; Risser et al.
Average woody, forb
, and grass heights were calculated by measuring the height of the closest vegetation type at ten equally spaced points.
cover was greater than graminoid cover in all but the sandiest, brightest environments [ILLUSTRATION FOR FIGURE 1A OMITTED].
The most common forb
species in the community were Daucus carota, Achillea millefolium, Hypericum perforatum, and Potentilla recta.
Amount of grass and forb
cover differed between random and occupied sites ([chi square] = 1806, P < 0.001, df = 2); relative to random sites, occupied sites had a higher percentage of grass cover (66.6 versus 56.2%) and forb
cover (16.0 versus 12.8%), although the relative amount of grass-to-forb cover was similar between the sites.