Northern Prairie Wildlife Research Center
| Table 6. Habitat variables (means ± SD) of grassland bird points at Tallgrass Prairie National Preserve, Kansas, 1999. | |||||
| Habitat Variable | Burned and Grazed (23 pts) |
Unburned and Ungrazed (1pt) |
Brome Field (5 pts) |
Riparian/Prairie (3 pts) |
All (32 pts) |
| Slope | 2.4 ± 2.6 | 5.5 | 0.6 ± 0.8 | 1.7 ± 1.7 | N/A |
| Aspect | 62.1 ± 80.8 | 35 | 29.2 ± 34.6 | 100.7 ± 130.6 | N/A |
| % Woody Cover | 0.0 | 0.0 | 0.0 | 2.8 | 0.7 |
| % Bare Ground | 8.0 | 0.0 | 1.7 | 13.9 | 7.3 |
| % Litter Cover | 1.4 | 16.7 | 5.0 | 0.0 | 6.0 |
| % Grass Cover | 60.2 | 66.7 | 90.0 | 30.6 | 62.4 |
| % Forb Cover | 29.2 | 16.7 | 3.3 | 47.2 | 26.3 |
| Average Litter Depth (cm) | 0.0 ± 0.2 | 9.0 ± 4.7 | 1.3 ± 1.1 | 0.2 ± 0.5 | 0.6 ± 1.9 |
| Average Grass Height (cm) | 13.9 ± 9.5 | 23.7 ± 9.4 | 50.2 ± 32.2 | 16.1 ± 11.1 | 20.3 ± 20.6 |
| Average Forb Height (cm) | 15.9 ± 10.8 | 33.2 ± 7.4 | 33.9 ± 22.1 | 19.4 ± 13.1 | 19.7 ± 15.1 |
| Average Veritical Hits | 6.0 ± 3.9 | 5.9 ± 3.1 | 11.0 ± 8.6 | 5.9 ± 5.0 | 6.8 ± 5.4 |
| Cover Index | 10.9 ± 8.8 | 2.6 ± 2.2 | 11.4 ± 15.7 | 15.5 ± 15.3 | 11.1 ± 11.0 |
| Grass-Density Index* | 2.0 ± 4.5 | 3.6 ± 2.0 | 7.1 ± 16.9 | 4.4 ± 8.9 | 3.1 ± 8.5 |
| Forb-Density Index* | 8.3 ± 9.3 | 10.3 ± 7.0 | 79.4 ± 177.3 | 10.0 ± 24.2 | 19.8 ± 76.1 |
| * Indices have inverse relationships with density (larger numbers indicate less density of grass and forbs). | |||||
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/tapr/tab6.htm
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