Table 1 Summary of species composition and soil strength data from 120 transects centered on and adjacent to horse trails in Coyote Canyon, Anza-Borrego Desert State Park, California, USA; Spring 2003.
Location of quadrat | N | Mean percent plant cover | Mean percent nonnative plant cover | Mean number of total species | Mean number of native species | Mean number of nonnative species | Mean soil strength (kg/cm2) | Mean number of macro-invertebrates |
|---|---|---|---|---|---|---|---|---|
Quadrat 1 (Trail) | 120 | 13.7 (10.1) | 5.7 (7.5) | 4.0 (2.0) | 3.0 (1.9) | 1.0 (0) | 2.2 (1.3) | 0.63 (1.4) |
Quadrat 2 (0 m) | 240 | 31.6 (15.0) | 10.4 (11.1) | 5.9 (2.3) | 5.0 (2.3) | 1.0 (0) | 1.6 (1.0) | 0.52 (1.1) |
Quadrat 3 (0.4 m) | 240 | 29.0 (14.4) | 10.3 (10.8) | 5.7 (2.4) | 4.7 (2.4) | 1.0 (0) | 1.7 (1.1) | 0.61 (1.3) |
Quadrat 4 (1.4 m) | 240 | 30.3 (15.2) | 10.9 (12.7) | 5.2 (2.1) | 4.3 (2.1) | 1.0 (0) | NA | NA |
Adjacent to feces | 64 | 30.8 (13.7) | 7.1 (6.9) | 6.4 (2.2) | 5.4 (2.3) | 1.0 (0) | NA | NA |
Quadrat 5 (Referent) | 240 | 31.7 (15.9) | 11.9 (13.5) | 4.9 (2.1) | 4.0 (2.1) | 1.0 (0) | 1.66 (1.0) | 0.43 (0.8) |