Table 3.
Average SOC stock (and 95% confidence intervals) in Mg C ha−1 according to the two estimation methods used in the study. SOCFD = fixed depth SOC stock estimate; SOCESM = equivalent soil mass SOC stock estimate. Different letters indicate statistically significant differences (P < 0.05).
| Treatment | Depth (cm) | SOCFD | Sig | SOCESM | Sig | ||
|---|---|---|---|---|---|---|---|
| Field | 0–50 | 124.9 (112.8–136.9) |
b | b | 124.9 (112.8–136.9) |
b | c |
| Hedgerow | |||||||
| all ages | 158.4 (139.4–177.5) |
a | 164.0 (144.2–183.8) |
a | |||
| 2–4 years | 130.8 (98.7–163) |
ab | 129.0 (100.2–157.8) |
bc | |||
| 10 years | 131.7 (112.1–151.3) |
b | 142.8.0 (124.1–161.5) |
abc | |||
| 37 years | 175.3 (148.7–201.8) |
a | 181.3 (153.2–209.5) |
a | |||
| Old |
185.7 (111.8–259.7) |
ab |
196.3 (129.3–263.3) |
ab |
|||
| Field | 0–30 | 97.3 (89.3–105.3) |
b | b | 97.3 (89.3–105.3) |
b | b |
| Hedgerow | |||||||
| all ages | 111.2 (98.2–124.1) |
a | 126.8 (111.9–141.7) |
a | |||
| 2–4 years | 99.4 (69.3–129.4) |
ab | 105.3 (71.8–138.8) |
ab | |||
| 10 years | 91.1 (71.5–110.6) |
ab | 110.5 (92.1–128.8) |
ab | |||
| 37 years | 127.0 (105.7–148.2) |
a | 135.7 (113.1–158.3) |
a | |||
| Old | 118.7 (78.2–159.2) |
ab | 146.0 (96.1–195.9) |
ab | |||