Article Figures & Data
Figures
- Figure 1.
Borders and road networks of Grand and Larimer Counties, Colorado.
- Figure 2.
Roadside vegetation health condition adjusted means along nonpaved roads both treated and nontreated with MgCl2-based dust suppression products in Larimer and Grand Counties by slope position from road edge (healthy = less than 5% damage, mild = 5% to 25% damage, moderate = 26% to 50% damage, severe = greater than 50% damage to crown or stem; n = 2,583 plots including vegetation). Letters (a, b, ab) signify significant differences (P < 0.05) between percent of severely damaged vegetation among upslope, downslope, and no slope positions. Symbols (x, y, xy) signify significant differences (P < 0.05) between percent of healthy vegetation among upslope, downslope, and no slope positions.
- Figure 3.
Modeled percent severely damaged lodgepole pine (A), ponderosa pine (B), and trembling aspen (C) and moderately damaged Engelmann spruce (D) adjusted means along nonpaved roads both treated and nontreated with MgCl2-based dust suppression products in Larimer and Grand Counties by slope position and increasing amount of MgCl2 applied per year (kg/km−1/year−1). The solution function in SAS 9.1 used to generate slopes for each species and slope position and only site factors that were significant at P < 0.05 are illustrated.
Tables
- Table 1.
Major habitat types, plot frequencies, and kilometers surveyed along nonpaved roads both treated and nontreated with MgCl2-based dust suppression products in Grand and Larimer Counties, Colorado.
County Habitat type Plot frequency Km (mi) of road cover Grand Forested/wooded 665 56.8 (35.3) Meadow 31 2.6 (1.6) Riparian 54 4.7 (2.9) Shrubland 341 29.3 (18.2) Wetland 34 2.9 (1.8) Rangeland 0 0.0 (0.0) Total 1125 96.2 (59.8) Larimer Forested/Wooded 841 157.6 (97.9) Meadow 39 7.4 (4.6) Riparian 250 46.8 (29.1) Shrubland 239 42.2 (26.2) Wetland 43 8.2 (5.1) Rangeland 38 7.1 (4.4) Total 1450 269.2 (167.3) - Table 2.
Major dominant species and percent of roadside cover along nonpaved roads both treated and nontreated with MgCl2-based dust suppression products surveyed in Grand and Larimer Counties, Colorado.
Species Percent cover in each county Common name Grand Larimer Pinus ponderosa Ponderosa pine — 18.2 Populus tremuloides Trembling aspen 18.8 17.1 Pinus contorta Lodgepole pine 29.4 15.3 Salix spp. Willow 11.6 7.8 Artemesia tridentata Big sagebrush 14.8 0.3 Chrysothamnus spp. Rabbitbrush 6.1 6.3 Picea engelmannii Engelmann spruce 2.3 5.0 Pseudotsuga menziesii Douglas-fir 1.2 4.9 Alnus spp. Alder species 3.5 4.5 Juniperus scopulorum Rocky Mt. juniper 4.0 3.4 Abies lasiocarpa Subalpine fir 2.7 2.8 Rhus trilobata Skunkbush — 1.9 Amelanchier alnifolia Serviceberry 1.6 — Populus angustifolia Narrowleaf cottonwood 1.2 1.8 Pinus flexilis Limber pine 0.2 1.7 Acer glabrum Rocky Mt. maple 0.3 1.4 Atriplex confertifolia Saltbush — 1.1 - Table 3.
Percentage of species healthy and severely damaged along nonpaved roads treated and nontreated with MgCl2-based dust suppression products in Grand and Larimer Counties, Colorado.z
Healthy vegetation cover (%) Severely damaged vegetation cover (%) Nontreated roads Treated roads Nontreated roads Treated roads All vegetation combined 89.2 78.3*** 4.0 7.6*** Abies lasiocarpa 99.2 87.8 0.8 4.3 Acer glabrum 79.2 69.5 19.7 30.3 Alnus spp. 73.9 75.3 10.5 19.3 Artemesia tridentata 98.1 98.7 1.1 1.3 Chrysothamnus spp. 68.6 89.1* 0.0 6.3 Juniperus scopulorum 95.4 62.3** 0.6 1.9 Pinus contorta 65.9 58.7* 6.2 13.3** Pinus flexilus 49.8 58.6 1.1 17.3 Picea engelmannii 94.8 75.4*** 2.5 3.1 Pinus ponderosa 98.0 69.2*** 0.0 5.4*** Populus angustifolia 98.3 68.4 0.1 6.5 Populus tremuloides 85.0 74.1*** 7.4 12.3** Pseudotsuga menzeisii 95.3 93.7 2.0 5.7 Salix spp. 80.3 71.9* 7.6 11.8
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