Table 2.
Substrate induced respiration ratios (substrate/basal respiration; mean ± 1 SE) under oxic (16 h) and anoxic conditions (48 h) of peat soil at three depths from peat cores collected from the James Bay Lowlands.
| Study site | Depth (cm) | Synthetic substrates |
|||||
|---|---|---|---|---|---|---|---|
| Alkali lignin | Amino acids | Glucose | Methyl cellulose | p-coumaric acid | Sodium benzoate | ||
| OXIC | |||||||
| Kinoje Bog | 0–10 | 2.08 (0.24) | 1.08 (0.10) | 0.89 (0.06) | 1.25 (0.12) | 0.92 (0.09) | 0.66 (0.05) |
| 50–60 | 2.03 (0.08) | 2.06 (0.13) | 0.99 (0.08) | 1.27 (0.09) | 0.94 (0.04) | 0.86 (0.06) | |
| 100–110 | 1.98 (0.25) | 1.49 (0.17) | 1.04 (0.12) | 0.94 (0.03) | 0.84 (0.09) | 0.99 (0.07) | |
| Victor Bog | 0–10 | 1.98 (0.20) | 1.67 (0.12) | 1.66 (0.02) | 1.13 (0.07) | 0.78 (0.01) | 0.93 (0.11) |
| 50–60 | 1.24 (0.12) | 1.28 (0.10) | 0.72 (0.05) | 0.78 (0.07) | 0.66 (0.06) | 0.62 (0.04) | |
| 100–110 | 3.48 (0.04) | 2.37 (0.41) | 1.69 (0.17) | 1.74 (0.14) | 1.48 (0.13) | 0.97 (0.03) | |
| Victor Fen | 0–10 | 1.62 (0.17) | 2.28 (0.13) | 3.27 (0.25) | 0.88 (0.04) | 1.47 (0.13) | 2.06 (0.08) |
| 50–60 | 1.96 (0.08) | 2.16 (0.14) | 2.47 (0.06) | 1.09 (0.12) | 1.23 (0.14) | 0.78 (0.09) | |
| 100–110 | 1.85 (0.06) | 2.71 (0.15) | 1.49 (0.12) | 1.02 (0.08) | 0.96 (0.05) | 0.81 (0.06) | |
| ANOXIC | |||||||
| Kinoje Bog | 0–10 | 2.04 (0.74) | 2.65 (0.24) | 2.48 (0.92) | 1.99 (0.46) | 1.40 (0.19) | 0.65 (0.09) |
| 50–60 | 1.30 (0.33) | 1.36 (0.22) | 1.44 (0.34) | 1.06 (0.06) | 0.89 (0.20) | 0.40 (0.13) | |
| 100–110 | 1.97 (0.26) | 1.26 (0.30) | 1.30 (0.08) | 1.03 (0.11) | 0.95 (0.08) | 0.51 (0.09) | |
| Victor Bog | 0–10 | 0.91 (0.24) | 0.93 (0.05) | 1.26 (0.27) | 1.08 (0.04) | 0.52 (0.04) | 0.47 (0.05) |
| 50–60 | 2.13 (0.45) | 1.82 (0.08) | 1.71 (0.16) | 1.39 (0.22) | 1.11 (0.21) | 0.89 (0.04) | |
| 100–110 | 1.50 (0.30) | 1.26 (0.44) | 1.09 (0.25) | 1.10 (0.41) | 0.86 (0.18) | 0.53 (0.15) | |
| Victor Fen | 0–10 | 2.58 (0.61) | 3.02 (0.50) | 5.24 (1.52) | 1.02 (0.12) | 1.51 (0.05) | 2.81 (0.49) |
| 50–60 | 1.57 (0.18) | 2.96 (0.35) | 2.91 (1.03) | 0.94 (0.24) | 0.25 (0.06) | 0.76 (0.08) | |
| 100–110 | 1.17 (0.04) | 1.96 (0.59) | 1.52 (0.05) | 0.85 (0.11) | 0.81 (0.15) | 0.47 (0.15) | |
| Study site | Depth (cm) |
Organic substrates |
|||||
| Rich fen sedge | Int. fen sedge | Int. fen Sphagnum | Poor fen Sphagnum | Mean ratio | |||
| OXIC | |||||||
| Kinoje Bog | 0–10 | 2.97 (0.65) | 1.75 (0.03) | 3.72 (0.94) | 4.65 (0.48) | 2.00 | |
| 50–60 | 3.80 (0.48) | 2.36 (0.25) | 4.36 (0.27) | 4.37 (0.59) | 2.30 | ||
| 100–110 | 6.01 (0.58) | 2.26 (0.38) | 4.36 (0.52) | 4.92 (0.51) | 2.48 | ||
| Victor Bog | 0–10 | 3.12 (0.30) | 2.26 (0.29) | 5.46 (0.13) | 6.68 (0.53) | 2.57 | |
| 50–60 | 3.11 (0.40) | 1.78 (0.22) | 2.83 (0.13) | 4.53 (0.32) | 1.75 | ||
| 100–110 | 9.53 (0.55) | 4.85 (1.33) | 6.55 (1.23) | 6.60 (0.64) | 3.93 | ||
| Victor Fen | 0–10 | 3.63 (0.39) | 3.28 (0.38) | 2.51 (0.15) | 3.42 (0.33) | 2.44 | |
| 50–60 | 4.88 (0.30) | 5.72 (0.54) | 3.09 (0.29) | 4.48 (0.42) | 2.79 | ||
| 100–110 | 7.25 (0.88) | 4.85 (0.42) | 4.58 (0.02) | 6.24 (0.25) | 3.18 | ||
| ANOXIC | |||||||
| Kinoje Bog | 0–10 | 2.06 (0.50) | 1.89 (0.63) | 2.69 (0.08) | 3.91 (1.06) | 2.18 | |
| 50–60 | 1.65 (0.30) | 1.50 (0.42) | 2.49 (0.31) | 2.16 (0.61) | 1.43 | ||
| 100–110 | 2.26 (0.49) | 3.08 (0.26) | 2.16 (0.57) | 2.62 (0.27) | 1.71 | ||
| Victor Bog | 0–10 | 1.31 (0.21) | 1.15 (0.04) | 1.82 (0.42) | 1.43 (0.53) | 1.09 | |
| 50–60 | 2.22 (0.36) | 1.91 (0.19) | 3.01 (0.42) | 2.94 (0.78) | 1.91 | ||
| 100–110 | 1.99 (0.46) | 2.27 (0.44) | 2.75 (0.59) | 2.80 (0.50) | 1.62 | ||
| Victor Fen | 0–10 | 4.3 (0.94) | 5.79 (1.31) | 3.55 (0.58) | 4.99 (0.30) | 3.48 | |
| 50–60 | 5.25 (1.56) | 6.32 (0.65) | 4.15 (0.32) | 6.56 (1.93) | 3.17 | ||
| 100–110 | 5.35 (0.82) | 5.95 (0.80) | 4.55 (0.91) | 6.36 (1.31) | 2.90 | ||
Int. represents Intermediate