Table 4 Summary of data (mean ± standard deviation) on terrain and soil parameters, forest structure and diversity for R- and B-forest types (20 plots each)
Variables (plot mean) | Ridge R | Bottom B | Variables (plot mean) | Ridge R | Bottom B | |
|---|---|---|---|---|---|---|
plot elevation (m) | 245*** ± 62 | 176 ± 42 | herbal ground cover (%) | 44.8 ± 12.4 | 54.5* ± 12.3 | |
plot steepness (% grade) | 44 ± 17 | 53 ± 17 | species richness (plots) | 26.9*** ± 5.3 | 20.3 ± 4.6 | |
soil organic matter (%) | 4.61 ± 0.73 | 4.79 ± 0.84 | Shannon diversity index | 3.04** ± 0.2 | 2.78 ± 0.24 | |
soil nitrogen (‰) | 1.46 ± 0.34 | 1.75' ± 0.61 | Inverse Simpson index | 25.3' ± 9.1 | 20.5 ± 7.3 | |
soil phosphorus (‰) | 0.46 ± 0.11 | 0.50 ± 0.08 | Shannon evenness | 0.93 ± 0.03 | 0.93 ± 0.02 | |
soil pH | 6.72 ± 0.27 | 6.71 ± 0.33 | timber | excellent timber (%) | 4.4 ± 7.7 | 5.0 ± 11.0 |
soil water content (%) | 30.2 ± 5.5 | 30.3 ± 6.9 | good timber (%) | 35.0 ± 18.5 | 47.1' ± 23.1 | |
tree (Ø ≥6 cm) count ha–1 | 1169* ± 251 | 989 ± 254 | moderate timber (%) | 42.9* ± 18.7 | 31.6 ± 14.3 | |
sapling count ha–1 | 515** ± 285 | 308 ± 94 | unknown value (%) | 11.9 ± 12.9 | 10.5 ± 11.6 | |
dicot tree seedlings m-1 | 1.42* ± 0.61 | 1.04 ± 0.47 | (only dicot trees with DBH ≥15 cm; percentage of TeAGB in category) | |||
mean dicot tree dbh (cm) | 12.7 ± 1.8 | 14.2* ± 1.7 | NTFP | excellent NTFP (%) | 9.9 ± 9.2 | 19.5 ± 17.4 |
mean (all) tree height (m) | 7.9' ± 0.8 | 7.4 ± 1.0 | good NTFP (%) | 24.8 ± 12.9 | 23.7 ± 15.3 | |
mean max. tree height (m) | 19.6* ± 3.2 | 17.6 ± 3.1 | moderate NTFP (%) | 30.6' ± 13.1 | 23.6 ± 12.3 | |
TBA (m2∙ha–1) | 30.1' ± 11.1 | 24.8 ± 7.9 | unknown value (%) | 11.8 ± 10.4 | 11.0 ± 10.3 | |
TeAGB (tons∙ha–1) | 126.4 ± 54.2 | 107.7 ± 45.7 | (all trees, saplings and palms; percentage of TeAGB in categorys | |||
dead biomass (% TeAGB) | 6.7 ± 8.4 | 10.8' ± 11.1 | plots cut (%) 2010-2015 | 45% | 70% | |