Table 3 C/N ratios of the organic matter within the grain size fractions of the topsoils after 3, 20, 55, 100, and 170 years under self-restoration and of an Albic Podzol, never been cultivated.
From: Dynamics of carbon pools in post-agrogenic sandy soils of southern taiga of Russia
| Â | Â | C/N ratios in grain size | |||||
|---|---|---|---|---|---|---|---|
| Â | Â | Sand | Silt | Clay | |||
Horizon | Depth cm | Coarse/Medium | Fine | Coarse | Medium | Fine | Â |
| Â | Â | 2.0-0.2 | 0.2-0.063 | 0.063-0.020 | 0.020-0.0063 | 0.0063-0.002 | <0.002 |
| Â | Â | mm | |||||
3 years | |||||||
Ah | 10(12)(1) | 31.4 | 28.8 | 14.0 | 12.9 | 12.0 | 10.7 |
Ap1 | 22 | 25.0 | 24.2 | 14.2 | 12.1 | 12.0 | 11.2 |
| Â | 33 | 34.7 | nd | 14.9 | 14.3 | 12.0 | 10.9 |
Ap2 | 40 | nd | nd | 23.2 | 14.9 | 12.0 | 9.6 |
20 years | |||||||
Ah | 2 | 21.0 | 24.5 | 16.5 | 13.2 | 12.4 | 8.3 |
Ap1 | 18 | nd | nd | 19.0 | 15.5 | 13.5 | 9.2 |
Ap2 | 25(28) | nd | nd | 21.3 | 18.0 | 15.5 | 10.1 |
55 years | |||||||
Ah-E | 1 | nd | nd | nd | nd | Nd | nd |
Ap1 | 8 | nd | nd | 38.9 | 24.2 | 23.8 | 13.2 |
Ap2 | 19 | nd | nd | 45.2 | 26.3 | 24.2 | 15.0 |
100 years | |||||||
E | 2 | nd | nd | 29.8 | 30.4 | 21.7 | 18.9 |
Bsh | 5 | nd | nd | 32.0 | 26.7 | 21.5 | 15.1 |
Ap | 10 | 36.7 | nd | 30.9 | 24.0 | 21.6 | 13.7 |
170 years | |||||||
E | 2 | 53.1 | 42.8 | 24.0 | 24.4 | 18.5 | 14.8 |
Bsh | 6 | nd | nd | 30.5 | 28.6 | 17.1 | 14.6 |
Ap | 15 | nd | nd | 46.9 | 29.9 | 24.9 | 17.5 |
Albic Podzol | |||||||
E | 6(8) | nd | nd | 44.6 | 38.0 | 28.5 | 17.7 |
Bsh | 10 | nd | nd | 31.6 | 26.8 | 22.9 | 17.5 |