Large Planting Stock Type and Mechanical Release Effects on the Establishment Success of Picea glauca Plantations in Quebec, Canada

Figure 1

Average percent cover (±standard error) of the principal groups of competing vegetation, as evaluated during the eighth growing season following planting of four experimental Picea glauca plantations established in south central Quebec (Canada). See Table 1 for a detailed description of each vegetation group. Treatments consisted of four intensities of vegetation management, including a control, mechanical release during the third growing season (REL3), mechanical release during the fifth growing season (REL5), and plots where competition for light was eliminated through repeated herbicide and mechanical release treatments (No competition: NC). Treatment effects were consistent across sites, except for the herbaceous species (refer to Table 2 for detailed ANOVA results). Data are presented separately for each site for clarity and convenience.