FIGURE 3.

Mean annual radial growth in drought and non‐drought years for the period of approximately 1980–2011 across the three site types (i.e., LEHP, low‐elevation sites with high productivity; MELP, mid‐elevation sites with low productivity; HELP, high‐elevation sites with low productivity). Error bars represent the mean ± standard error (n = 615). Letters on top of the bars show the results (a < b < c) of the post hoc Tukey multiple comparison test with a threshold <0.05 for statistical significance indicating the differences among the three site types and between non‐drought years and drought years within each site type