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Table I
Stand level variables in the experimental plots (extent 0.5 ha) in Navafría forest (N1, N2, N3, N4 and N5) and Valsaín forest (V1, V2, V3, V4, V5, V6, V7 and V8): Plot size (m × m); Age class (years); N ≥ 7.5 cm and N < 7.5 cm (saplings), tree with DBH ≥ 7.5 cm and DBH < 7.5 cm number per ha respectively with DBH being mean diameter at breast height (cm) of tree; BA, basal area (m2 ha−1); H, mean tree height (m) of the plot ± standard deviation; H max, maximum tree height of the plot; H min, minimum tree height of the plot.
| Study site | Stand | Plot size | Age class | N ≥ 7.5 cm | N < 7.5 cm | BA | H | H max | H min |
|---|---|---|---|---|---|---|---|---|---|
| N1 | 70.7 × 70.7 | 1–20 | 0 | 6522 | 27.8 | 5.9 ± 1.4 | 10.2 | 1.7 | |
| N2 | 110 × 45.5 | 21–40 | 2460 | 0 | 41.8 | 12 ± 1.2 | 17 | 5.6 | |
| Navafría | N3 | 70.7 × 70.7 | 41–60 | 680 | 0 | 60.6 | 22.0 ± 2.8 | 28.9 | 6.2 |
| N4 | 70.7 × 70.7 | 61–80 | 364 | 0 | 48.2 | 20.4 ± 1.5 | 25.1 | 16.4 | |
| N5 | 70.7 × 70.7 | 81–100 | 304 | 0 | 44.2 | 22.1 ± 2 | 31 | 16.7 | |
| V1 | 100 × 50 | 1–20 | 584 | 7468 | 34.4 | 3.8 ± 3.6 | 29.9 | 0.7 | |
| V2 | 85 × 58.8 | 21–40 | 1668 | 936 | 41.0 | 11.3 ± 4.9 | 27.6 | 1.4 | |
| V3 | 100 × 50 | 41–60 | 1322 | 0 | 48.5 | 16.4 ± 2.8 | 23.2 | 4.4 | |
| Valsaín | V4 | 100 × 50 | 61–80 | 686 | 0 | 53.3 | 23.5 ± 2.0 | 28.8 | 16 |
| V5 | 70.7 × 70.7 | 81–100 | 550 | 0 | 54.0 | 22.2 ± 2.6 | 29.9 | 16.6 | |
| V6 | 100 × 50 | 101–120 | 334 | 318 | 41.4 | 10.7 ± 10.9 | 30.9 | 1.3 | |
| V7 | 70.7 × 70.7 | Uneven | 608 | 964 | 25.2 | 5.9 ± 5.2 | 24.3 | 1.3 | |
| V8 | 100 × 50 | Uneven | 578 | 244 | 22.7 | 8.0 ± 4.2 | 19.5 | 1.4 |