N | Surface and sub-surface soil carbon stocks (Mg ha−1) | ||||
---|---|---|---|---|---|
0–15 cm | 15–30 cm | Total (0–30 cm) | CO2 equiv. | ||
Sub-watershed (SW) | |||||
Untreated | 40 | 8.70b | 7.36b | 16.06b | 58.92b |
Treated | 50 | 14.45a | 9.95a | 24.40a | 89.55a |
Landscape position (LP) | |||||
Untreated upper | 20 | 8.66b | 7.63b | 16.29c | 59.80c |
Lower | 20 | 8.73b | 7.09b | 15.82c | 58.05c |
Treated upper | 20 | 13.79a | 12.16a | 25.95a | 95.21a |
Lower | 30 | 14.90a | 8.48b | 23.38b | 85.77b |
Land-use types (LU) | |||||
Untreated crop | 20 | 8.34c | 7.62c | 15.97c | 58.59c |
Grazing | 20 | 9.05c | 7.10c | 16.15c | 59.26c |
Treated crop | 20 | 14.65b | 12.98a | 27.43a | 100.66a |
Grazing | 20 | 13.43b | 9.76b | 23.19b | 85.12b |
Tree lucerne | 10 | 16.10a | 4.66d | 20.76b | 76.18b |
P-SW | *** | *** | *** | *** | |
P-LP | ns | *** | * | * | |
P-LU | * | *** | ** | ** |