Table 4 Classes of nutrient cycle types based on C/N ratio and base saturation according to Schulze [21]
Classes of nutrient cycle types | C/N (%/%) | Base saturation (%) |
|---|---|---|
1. Poor | 29 to 50 | 3 to 15 |
2. Quite poor | 26 to 33 | 10 to 20 |
3. Moderately nutritious | 17 to 26 | 15 to 30 |
4. Moderately nutritious, carbonate-containing | 17 to 21 | > 90 |
5. Vigorous nutritious | 13 to 18 | 30 to 50 |
6. Vigorous nutritious, carbonate-containing | 13 to 15 | > 90 |
7. Nutrient-rich | 11 to 14 | 50 to 80 |
8. Nutrient-rich, carbonate-containing | 8 to 11 | 80 to 100 |
9. Poor, organic | 30 to 60 | < 26 |
10. Quite poor, organic | 26 to 36 | < 26 to 52 |
11. Moderately nutritious, organic | 20 to 26 | < 26 to 52 |
12. Vigorous nutritious, organic | 13 to 20 | > 26 |
13. Nutrient-rich, carbonate-containing, organic | < 10 to 30 | > 90 |
14. Quite poor, carbonate-containing, organic | 20 to 31 | > 52 |