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Table I
Statistics of leaf-litter N and P concentrations as well as N:P ratio for different functional groups at a global scale (the data used is listed as Appendix S1). Standard deviation (SD) is given.
| Stoichiometric traits | n | Mean | Min. | Max. | SD | |
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| Woody plants (all samples) | ||||||
| N (mg g-1) | 677 | 10.93 | 0.60 | 50.50 | 6.48 | |
| P (mg g-1) | 482 | 0.85 | 0.10 | 6.40 | 0.71 | |
| N:P ratio | 482 | 18.32 | 0.20 | 79.00 | 11.17 | |
| Shrubs | ||||||
| N (mg g-1) | 61 | 10.24a* | 3.80 | 38.10 | 6.06 | |
| P (mg g-1) | 42 | 0.92a | 0.10 | 3.07 | 0.74 | |
| N:P ratio | 42 | 15.98ac | 2.63 | 46.00 | 11.32 | |
| Evergreen broadleaf | ||||||
| N (mg g-1) | 176 | 12.30b | 1.41 | 30.60 | 6.02 | |
| P (mg g-1) | 141 | 0.84a | 0.10 | 6.40 | 0.86 | |
| N:P ratio | 141 | 20.67b | 0.80 | 69.33 | 11.68 | |
| Deciduous broadleaf | ||||||
| N (mg g-1) | 306 | 12.12b | 0.76 | 50.50 | 6.69 | |
| P (mg g-1) | 234 | 0.90a | 0.10 | 4.40 | 0.65 | |
| N:P ratio | 234 | 18.20a | 0.20 | 79.00 | 11.46 | |
| Conifers | ||||||
| N (mg g-1) | 134 | 6.69c | 0.60 | 38.10 | 4.71 | |
| P (mg g-1) | 65 | 0.62b | 0.10 | 2.42 | 0.47 | |
| N:P ratio | 65 | 15.13c | 2.33 | 38.00 | 7.31 | |