The distribution of environmental variables (slope, solar radiation index [SRI], and precipitation [cm] one year after treatment) varied between treatments, and was incorporated into the models to determine their significance and effect size. The bold lines are the medians, the boxes represent 50 % of the data, and each whisker represents 25 % of the data. Dots are outliers and the extreme values represent maximum or minimum value if present. When there are no outliers, the whiskers’ ends depict minimum and maximum values. Slope and solar radiation did not significantly influences shrubs (shrub cover: P > 0.4 and P > 0.3, native shrub richness: P > 0.07 and P < 0.3, and buckbrush cover: P > 0.8 and P > 0.8, respectively).