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Table 4 Non-native annual grass abundance model estimates with standard error and P-value for the main effects and interaction (treatment by years since treatment). Different letters depict significant differences in shrub cover at α ≤ 0.05. Numbers depict marginal significant levels 0.05 ≤ α ≥ 0.10. Significance codes: *** <0.001, ** <0.01, * <0.05, . <0.1. Estimates (Est), standard errors (± SE), and P-values (P) are rounded to the nearest one hundredth. P-value of *** implies P-value <0.001.

From: Decade-Long Plant Community Responses to Shrubland Fuel Hazard Reduction

    Control Fire-fall Fire-winter Fire-spring Mastication-fall Mastication-spring
    Est ± SE P Est ± SE P Est ± SE P Est ± SE P Est ± SE P Est ± SE P
Main effect Intercept   41.06±11.16 *** 36.46±17.03 0.03* 20.72±15.72 0.19 15.42±15.75 0.33 104.98±17.50 *** 45.68±15.04 ***
Yr since treatment   −0.39±9.26 0.97 −0.87±2.55 0.73 0.96±2.61 0.72 1.27±2.99 0.67 −4.33±2.54 0.09. 0.57±2.28 0.8
Control A1B             
Fire-fall ABC −4.60±16.35 0.78           
Fire-winter 1C −25.64±14.74 0.08. −15.73±13.03 0.23         
Fire-spring AC −20.33±14.93 0.17 −21.04±13.30 0.11 −5.31±12.25 0.67       
Mastication-fall D 63.94±17.17 *** 68.54±15.31 *** 84.26±14.59 *** 89.58±15.28 ***     
Mastication-spring B 4.62±14.60 0.75 9.22±13.40 0.49 24.95±12.45 0.05* 30.26±12.95 0.02* −59.31±13.76 ***   
Survey yr precipitation   8.82±6.76 0.19 8.82±6.76 0.19 8.83±6.76 0.19 8.82±6.76 0.19 8.83±6.76 0.19 8.82±6.76 0.19
Treatment × yr since treatment Control ABC             
Fire-fall ABC −0.49±9.89 0.96           
Fire-winter AD 1.65±10.02 0.87 1.83±2.49 0.46         
Fire-spring A1 1.34±9.90 0.89 2.14±2.87 0.46 0.31±2.88 0.91       
Mastication-fall B1 −3.95±9.93 0.69 −3.46±2.40 0.15 −5.29±2.40 0.03* −5.60±2.87 0.05.     
Mastication-spring CD 0.95±9.83 0.92 1.44±2.24 0.52 −0.39±2.24 0.86 −0.70±2.72 0.8 4.90±2.10 0.02*