Leaf Area and Structural Changes after Thinning in Even-Aged Picea rubens and Abies balsamea Stands in Maine, USA

Figure 1

Mean ± one standard error pre- to postthinning average diameter ratios (𝑑/𝐷) for the commercial thinning types (crown, dominant, low) and reduction levels (33% and 50%) implemented by the Cooperative Forestry Research Unit Commercial Thinning Research Network. Statistical analysis was conducted independently for PCT (precommercial thinning history) and NOPCT (no history of precommercial thinning) groups. Letters represent significant differences determined using Tukey’s test.