Table 3. Summary of the selection process leading to the formation of valid black spruce chronologies (EPS ≥ 0.85, 1900–2012) from the broadest to the finest spatial scales with and without considerations of the soil physical environment type (+soil).
| Spatial scale | Median area (km2) | Selected series with iterative procedure | Selected series with chronology EPS ≥ 0.85 | Valid chronological statistics* | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Sites (%) | Trees (%) | Sites (%) | Trees (%) | N | Covered area (%) | Mean series frequency in chronology [range] | Mean correlation to master chronology [range] | Rbar [range] | ||
| Meridional | 583,077 | 20,709 (60.7) | 33,634 (35.7) | 20,709 (60.7) | 33,634 (35.7) | 1 | 100 | 33,634 | 0.34 | 0.12 |
| + soil | - | 21,228 (62.2) | 35,153 (37.4) | 21,228 (62.2) | 35,153 (37.4) | 10 | 100 | 2,318 [1,131–13,314] | 0.35 [0.34–0.39] | 0.13 [0.11–0.15] |
| Domain | 81,193 | 21,820 (64.0) | 37,384 (39.7) | 21,817 (64.0) | 37,377 (39.7) | 5 | 97.8 | 8,006 [167–13,200] | 0.37 [0.32–0.40] | 0.15 [0.11–0.17] |
| + soil | - | 22,517 (66.0) | 39,354 (41.8) | 22,418 (65.7) | 39,181 (41.6) | 40 | 97.8 | 644 [46–6 595] | 0.38[0.32–0.47] | 0.15 [0.10–0.20] |
| Sub-domain | 39,798 | 23,565 (69.1) | 42,164 (44.8) | 23,554 (69.1) | 42,142 (44.8) | 9 | 96.8 | 4,947 [156–10,495] | 0.38 [0.33–0.40] | 0.17 [0.12–0.20] |
| + soil | - | 24,276 (71.2) | 44,039 (46.8) | 24,088 (70.6) | 43,707 (46.4) | 72 | 96.8 | 372 [41–4,869] | 0.39 [0.32–0.46] | 0.17 [0.09–0.24] |
| Region | 11,562 | 25,436 (74.6) | 47,461 (50.4) | 25,373 (74.4) | 47,350 (50.3) | 41 | 94.7 | 771 [92–4,096] | 0.38 [0.31–0.43] | 0.16 [0.10–0.22] |
| + soil | - | 26,039 (76.4) | 49,939 (53.1) | 24,475 (71.8) | 46,353 (49.2) | 190 | 94.7 | 142 [30–1,794] | 0.40 [0.31–0.48] | 0.18 [0.09–0.27] |
| Sub-region | 6,589 | 25,568 (75.0) | 48,040 (51.0) | 25,466 (74.7) | 47,815 (50.8) | 59 | 93.5 | 519 [49–3,903] | 0.40 [0.31–0.47] | 0.17 [0.10–0.27] |
| + soil | - | 26,314 (77.2) | 51,105 (54.3) | 23,959 (70.3) | 45,861 (48.7) | 228 | 89.5 | 124 [29–1,794] | 0.40 [0.31–0.51] | 0.18 [0.09–0.32] |
| Landscape | 2,559 | 26,449 (77.6) | 51,123 (54.3) | 26,169 (76.7) | 50,492 (53.7) | 146 | 88.9 | 263 [49–1,598] | 0.40 [0.31–0.47] | 0.18 [0.10–0.30] |
| + soil | - | 27,494 (80.6) | 56,040 (70.2) | 21,409 (62.8) | 42,151 (44.8) | 366 | 81.1 | 82 [7–642] | 0.42 [0.29–0.70] | 0.19 [0.08–0.46] |
| District | 203 | 28,841 (84.6) | 61,950 (65.8) | 18,744 (55.0) | 38,640 (41.1) | 562 | 34.9 | 59 [18–608] | 0.43 [0.31–0.55] | 0.20 [0.09–0.41] |
| + soil | - | 27,698 (81.2) | 68,938 (73.2) | 6,702 (19.7) | 14,586 (15.5) | 288 | 16.2 | 45 [7–294] | 0.45 [0.33–0.70] | 0.21 [0.09–0.46] |
* All statistics are medians of the population.
Rbar, mean correlation between all pairs of residual series.
EPS, expressed population signal.