Appendix A. A table of habitat properties of forests and clear–cuts in south– and north–facing slopes and their correlations with NMS site scores and potential annual direct radiation.
TABLE A1. Habitat properties of forests and clear-cuts in south- and north-facing slopes and their correlations with NMS site scores and potential annual direct radiation (PAR). Data are mean values of ten plots with ranges in parentheses. Plot size is 200 m2. n.a. = not available.
Forest |
Clear-cut |
Correlations |
|||||||||
South facing |
North facing |
South facing |
North facing |
Axis 1 |
Axis 2 |
PAR |
|||||
Slope and plot variables |
|||||||||||
Aspect (°; 180° = S) |
189 (125–230) |
8 (325–64) |
195 (120–230) |
18 (340 – 50) |
― |
― |
― |
||||
Inclination (°) |
31 (22–41) |
34 (25–41) |
30 (20–38) |
32 (24–43) |
― |
― |
― |
||||
Potential annual direct radiation (PAR; MJ cm-2 yr-1) |
0.78 (0.69–0.87) |
0.24 (0.17–0.38) |
0.74 (0.68–0.84) |
0.26 (0.19–0.34) |
0.13 |
0.74** |
1.00 |
||||
Distance to nearest edge (m) |
51 (25–116) |
48 (25–143) |
91 (26–221) |
79 (35–175) |
-0.24 |
0.05 |
0.04 |
||||
Distance to valley bottom (m) |
19 (11–48) |
16 (11–33) |
17 (11–42) |
19 (11–40) |
0.15 |
0.00 |
-0.05 |
||||
Distance to ridge top (m) |
21 (11–30) |
17 (11–28) |
20 (12–25) |
15 (10–22) |
0.16 |
0.54** |
0.44** |
||||
Forest structure |
|||||||||||
Stand or clear–cut age (yr) |
107 (80–134) |
107 (80–134) |
11 (3–22) |
11 (3–22) |
0.45** |
-0.27 |
0.01 |
||||
All trees |
|||||||||||
Number of trees per plot |
19 (5–32) |
23 (14–46) |
3 (0–22) |
1 (0–3) |
0.44** |
-0.14 |
0.05 |
||||
Basal area (m2/ha) |
22 (18–29) |
19 (14–24) |
1 (0–9) |
0 (0–4) |
0.46** |
-0.19 |
0.09 |
||||
Canopy cover (m2) |
n.a. |
n.a. |
n.a. |
n.a. |
― |
― |
― |
||||
Pine |
|||||||||||
Number of trees per plot |
2 (0–6) |
1 (0–3) |
2 (0–17) |
0 (0–0) |
0.18 |
0.06 |
0.26 |
||||
Basal area (m2/ha) |
4 (0–10) |
3 (0–8) |
1 (0–6) |
0 (0–0) |
0.22 |
-0.04 |
0.12 |
||||
Canopy cover (m2) |
16 (0–41) |
8 (0–28) |
7 (0–48) |
0 (0–4) |
0.06 |
0.19 |
0.36* |
||||
Spruce |
|||||||||||
Number of trees per plot |
11 (3–23) |
18 (12–30) |
1 (0–3) |
0 (0–1) |
0.37* |
-0.28 |
-0.06 |
||||
Basal area (m2/ha) |
13 (7–22) |
13 (11–19) |
0 (0–1) |
0 (0–1) |
0.38* |
-0.35* |
-0.05 |
||||
Canopy cover (m2) |
91 (21–152) |
121 (83–152) |
8 (0–31) |
6 (0–23) |
0.42** |
-0.29 |
-0.09 |
||||
Broadleaves |
|||||||||||
Number of trees per plot |
6 (0–19) |
4 (0–24) |
0 (0–3) |
0 (0–2) |
0.57** |
0.16 |
0.37* |
||||
Basal area (m2/ha) |
5 (0–16) |
2 (0–9) |
0 (0–3) |
0 (0–3) |
0.54** |
-0.07 |
0.23 |
||||
Canopy cover (m2) |
39 (0–78) |
23 (0–92) |
28 (1–74) |
20 (0–39) |
0.28 |
0.41** |
0.37* |
||||
Substrates (m2) |
|||||||||||
FWD |
6 (4–9) |
5 (1–14) |
17 (8–34) |
10 (1–27) |
-0.13 |
0.57** |
0.45** |
||||
CWD |
1.6 (0.2–3.1) |
1.3 (0.2–3.2) |
1.8 (1.1–3.2) |
1.7 (0.8–2.7) |
0.36* |
0.13 |
0.09 |
||||
Litter + humus + mineral soil |
8 (0–17) |
3 (0–15) |
10 (1–32) |
0 (0–1) |
0.26 |
0.63** |
0.70** |
||||
Notes: Correlations are Spearman rank correlation coefficients. Aspect and inclination were not tested as they are synthesized in PAR. **Correlation is significant at the 0.01 level (two-tailed).* Correlation is significant at the 0.05 level (two-tailed).