Table 1 Contents of total organic carbon and C/N ratios, free particulate organic matter (free POM) of the density fraction <1.8 g cm-3 and the mineral associated organic matter (<20 μm) of the density fraction >1.8 g cm-3 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
Horizon | Depth | C | C/N | Free POM of the density fraction <1.8 g cm-3 | Mineral associated OM (<20 μm) of the density fraction >1.8 g cm-3 | ||||
|---|---|---|---|---|---|---|---|---|---|
| Â | cm | g kg -1 | Â | % of soil | % of SOC | C/N | % of soil | % of SOC | C/N |
3 years | |||||||||
Ah | 10(12)(1) | 23.7 | 15.6 | 1.33 | 56.2 | 12.5 | 0.62 | 26.3 | 12.1 |
| Â | 22 | 19.6 | 15.1 | 1.11 | 56.6 | 13.4 | 0.62 | 31.7 | 12.2 |
Ap1 | 33 | 19.1 | 16.5 | 0.81 | 42.6 | 12.7 | 0.48 | 25.2 | 12.7 |
Ap2 | 40 | 8.1 | 16.6 | 0.35 | 42.7 | 15.6 | 0.24 | 30.0 | 11.8 |
20 years | |||||||||
Ah | 2 | 29.9 | 14.6 | 2.25 | 75.3 | 14.9 | 0.61 | 20.3 | 13.7 |
Ap1 | 18 | 14.9 | 14.1 | 0.69 | 46.1 | 17.3 | 0.50 | 33.5 | 14.4 |
Ap2 | 25(28) | 13.7 | 15.6 | 0.73 | 53.2 | 18.3 | 0.53 | 38.6 | 14.4 |
55 years | |||||||||
Ah-E | 1 | nd | nd | nd | nd | nd | nd | nd | nd |
Ap1 | 8 | 18.2 | 27.2 | 1.13 | 62.0 | 32.2 | 0.54 | 29.6 | 18.9 |
Ap2 | 19 | 12.3 | 27.0 | 0.68 | 55.1 | 33.8 | 0.39 | 32.0 | 18.8 |
100 years | |||||||||
E | 2 | 36.1 | 28.6 | 2.46 | 68.0 | 27.4 | 0.86 | 23.8 | 21.2 |
Bsh | 5(9) | 26.5 | 26.5 | 1.08 | 40.8 | 30.6 | 0.93 | 35.3 | 22.4 |
Ap | 20 | 20.0 | 30.3 | 1.03 | 51.3 | 25.6 | 0.85 | 42.4 | 20.4 |
170 years | |||||||||
E | 2 | 21.7 | 31.2 | 1.53 | 70.5 | 27.9 | 0.54 | 24.9 | 19.0 |
Bsh | 6 | 20.6 | 28.3 | 1.35 | 65.6 | 32.4 | 0.59 | 28.8 | 19.8 |
Ap | 15 | 15.4 | 41.8 | 1.05 | 68.3 | 37.6 | 0.49 | 31.8 | 22.8 |
Albic Podzol | |||||||||
E | 6(8) | 20.9 | 38.1 | 1.56 | 74.5 | 40.3 | 0.48 | 23.1 | 28.3 |
Bsh | 10 | 26.4 | 35.7 | 1.03 | 38.9 | 35.7 | 0.85 | 32.2 | 26.5 |