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Table 1 Carbon (C) and nitrogen (N) contents of stem wood of the main tree species of the watershed
| Carbon (C) contents (% dm) | Nitrogen (N) contents (% dm) | DBH (cm) | C/N ratio | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Trees species | n | Min | Max | Mean (SE) | Min | Max | Mean (SE) | Min | Max | Min | Max | Mean (SE) |
| Terminalia macroptera | 19 | 46.267 | 51.241 | 49.474 (0.266) | 0.108 | 0.303 | 0.192 (0.013) | 9.3 | 40.7 | 160.50 | 428.39 | 281.81 (18.33) |
| Terminalia avicennioides | 03 | 47.971 | 49.759 | 48.70 (0.53) | 0.155 | 0.181 | 0.168 (0.007) | 16.6 | 24 | 265.03 | 312.16 | 289.96 (13.67) |
| Acacia seyal | 14 | 43.928 | 53.071 | 46. 50 (0.684) | 0.13 | 0.583 | 0.290 (0.037) | 7.6 | 34.4 | 80.71 | 357.6 | 194.24 (21.72) |
| Acacia gourmaensis | 02 | 47.55 | 48.09 | 47.824 (0.269) | 0.297 | 0.349 | 0.323 (0.025) | 13.4 | 19 | 160.11 | 137.80 | 148.95 (11.15) |
| Combretum glutinosum | 11 | 41.737 | 45.959 | 44.72 (0.438) | 0.14 | 0.358 | 0.241 (0.020) | 8 | 32 | 125.94 | 320.95 | 201.36 (19.15) |
| Pterocarpus erinaceus | 21 | 46.779 | 51.645 | 49.438 (0.278) | 0.164 | 0.427 | 0.242 (0.014) | 6.9 | 44.7 | 110.09 | 295.09 | 216.28 (10.63) |
| Anogeisus leiocarpus | 16 | 44.037 | 46.003 | 44.917 (0.167) | 0.08 | 0.273 | 0.128 (0.012) | 6.9 | 32.4 | 161.30 | 570.05 | 386.52 (28.28) |
| Mitragyna inermis | 18 | 44.978 | 47.74 | 46.724 (0.174) | 0.177 | 0.354 | 0.243 (0.011) | 7 | 34.5 | 129.46 | 262.19 | 199.40 (9.23) |
| Lannea microcrapa | 20 | 42.091 | 45.938 | 44.282 (0.209) | 0.148 | 0.405 | 0.273 (0.015) | 7 | 50.3 | 110.95 | 306.08 | 173.47 (11.14) |
| Lannea acida | 6 | 43.408 | 45.164 | 44.526 (0.248) | 0.14 | 0.386 | 0.265 (0.035) | 10.8 | 36 | 115.60 | 320.80 | 186.92 (30.61) |
| Ficus sp | 21 | 43.931 | 46.38 | 45.153 (0.139) | 0.16 | 0.427 | 0.294 (0.015) | 8.6 | 52.7 | 105.3 | 286.90 | 163.14 (9.83) |
| Crosopteryx febrifuga | 18 | 47.662 | 52.229 | 49.172 (0.217) | 0.118 | 0.306 | 0.182 (0.014) | 5.6 | 30.6 | 161.14 | 417.54 | 295.68 (20.50) |
| Entada Africana | 15 | 45.852 | 48.377 | 47.098 (0.191) | 0.242 | 0.475 | 0.357 (0.016) | 8.4 | 27.6 | 100.09 | 196.18 | 135.97 (6.75) |
| Parkia biglobosa | 23 | 44.02 | 47.636 | 46.516 (0.214) | 0.127 | 0.396 | 0.201 (0.013) | 8.6 | 62.4 | 119.40 | 358.43 | 247.85 (12.35) |
| Vitelaria paradoxa | 22 | 45.972 | 50.032 | 47.942 (0.228) | 0.13 | 0.337 | 0.228 (0.010) | 8 | 60 | 136.41 | 367.23 | 220.11 (11.37) |
| Azadirachta indica | 16 | 47.253 | 52.999 | 49.005 (0.413) | 0.104 | 0.302 | 0.177 (0.014) | 8.8 | 50.5 | 162.43 | 474.64 | 302.38 (22.53) |
| Anacardium occidentale | 25 | 44.928 | 47.693 | 46.446 (0.138) | 0.103 | 0.32 | 0.161 (0.011) | 9.2 | 57.9 | 146 | 441.34 | 375.79 (17.58) |
| Eucalyptus grandis | 7 | 47.018 | 49.031 | 47.744 (0.350) | 0.125 | 0.191 | 0.157 (0.011) | 5.7 | 29.2 | 247.25 | 376.14 | 310.57 (21.94) |
