Table 4. Chemical properties of Pinus sylvestris fine roots before and after nine years of irrigation.
| 2003 | 2012 | |||||
| Control | Irrigated | p | Control | Irrigated | p | |
| Cellulose (%) | 15.5 | 16.5 | 0.719 | 9.5 | 11.3 | 0.430 |
| Lignin (%; n = 4) | 37.1 | 37.7 | 0.865a | 53.0 | 47.2 | 0.284a |
| Phenol (%) | 0.17 | 0.17 | 0.933 | 0.18 | 0.18 | 0.983 |
| C-bulk (%) | 45.6 | 45.0 | 0.225 | 43.9 | 43.4 | 0.102 |
| N-bulk (%) | 0.96 | 1.03 | 0.605 | 0.81 | 0.75 | 0.040 |
| C/N | 50.5 | 46.9 | 0.519 | 56.1 | 60.5 | 0.080 |
| Lignin/N (n = 4) | 42.3 | 36.9 | 0.040 | 70.3 | 63.7 | 0.484 |
| δ13C-cellulose | −25.1 | −25.1 | 0.947 | −23.9 | −24.8 | 0.001 |
| δ13C-bulk | −26.9 | −26.8 | 0.773 | −26.3 | −27.2 | <0.001 |
a
calculated from one-way ANOVA, only one sample was extracted per plot.
Mean values are listed for amount of cellulose, Klason lignin, total phenol, amount of C in bulk roots (C-bulk), amount of nitrogen in bulk roots (N-bulk), the ratio of carbon to nitrogen in bulk roots (C/N) and the δ13C of cellulose and bulk root. Mixed model followed by ANOVA: p-values in bold are significant (p < 0.05), (n = 12).