Table 5. Percentage over- (positive values) or underrepresentation (negative values) of land cover in roadside buffers of three widths compared to the land cover of the surrounding region for coarse-resolution land cover data.

Buffer width (m)
Land cover category† 400 200 50
Roads on southern Cumberland Plateau
Nonforested wetland (< 1.0%) –0.05 –7.06 –65.77
Forested wetland (0%) n/a§ n/a n/a
Pasture/grassland (18.3%) 62.97 102.1 167.9
Row crop (1.3%) 44.19 55.02 54.58
Upland deciduous forest (69.8%) –14.23 –24.33 –40.99
Upland mixed forest (1.6%) –3.89 4.02 20.56
Upland coniferous forest (7.5%) –25.82 –31.85 –44.26
Urban/developed (< 1.0%) 126.9 288.1 866.1
Nonvegetated (1.0%) –31.58 –33.8 –39.39
Breeding Bird Survey routes in Tennessee¦
Nonforested wetland (< 1.0%) –65.44 –66.62 –75.52
Forested wetland (3.0%) –55.66 –59.54 –62.47
Pasture/grassland (37.3%) 9.33 20.42 34.17
Row crop (5.8%) 18.11 21.66 22.92
Upland deciduous forest (40.6%) –13.67 –22.66 –31.84
Upland mixed forest (4.5%) 19.9 19.01 10.64
Upland coniferous forest (3.6%) 5.71 –0.31 –16.02
Urban/developed (1.9%) 15.53 37.24 68.98
Non-vegetated (< 1.0%) –57.63 –70.22 –77.05
† The proportion of the entire surrounding region covered by each of the three buffers for the statewide analysis was: 400-m buffer, 0.009; 200-m buffer, 0.007; 50-m buffer 0.002. The total area of land cover analyzed (i.e., the state of Tennessee) was 10,905,576 ha.
‡The percent cover of the land cover category in the entire surrounding region in 1990 is given in parentheses.
§Not applicable.
¦The percent cover of the land cover category in Tennessee is given in parentheses.