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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)

From: Tree species diversity and utilities in a contracting lowland hillside rainforest fragment in Central Vietnam

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%
  1. Differences between forest types were significant at levels of p < 0.01', p < 0.05*, p < 0.005**, and p < 0.0005***