Table 2.
Distribution of 14C recovered in microcosms at final harvest. Data show percentages of totals per labelling run (means ± SE)
| Fraction | Temperature treatments | Treatment averages | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 4°C Air | 9°C Air | Air | Soil | |||||||
| 4°C Soil | 9°C Soil | 4°C Soil | 9°C Soil | 4°C | 9°C | Δ% | 4°C | 9°C | Δ% | |
| L. alpina | ||||||||||
| Shoots | 40.8 ± 7.8 | 47.9 ± 3.5 | 34.5 ± 4.4 | 53.0 ± 8.7 | 44.3 ± 0.1 | 43.8 ± 1.6 | −1 | 37.6 ± 4.3 | 50.4 ± 4.5 | +34 |
| Roots | 1.63 ± 0.32 | 4.24 ± 0.65 | 2.05 ± 0.81 | 3.69 ± 1.38 | 2.93 ± 0.05 | 2.87 ± 1.61 | −2 | 1.84 ± 0.41 | 3.97 ± 0.71 | +115 |
| 0–5 cm | 1.11 ± 0.14 | 1.91 ± 0.33 | 1.43 ± 0.59 | 1.06 ± 0.32 | 1.51 ± 0.21 | 1.24 ± 0.57 | −18 | 1.27 ± 0.29 | 1.48 ± 0.27 | +17 |
| 5–10 cm | 0.30 ± 0.10 | 0.98 ± 0.21 | 0.49 ± 0.22 | 1.48 ± 0.65 | 0.64 ± 0.11 | 0.98 ± 0.65 | +54 | 0.39 ± 0.12 | 1.23 ± 0.33 | +212 |
| 10–15 cm | 0.22 ± 0.08 | 1.35 ± 0.40 | 0.13 ± 0.04 | 1.16 ± 0.48 | 0.79 ± 0.15 | 0.65 ± 0.39 | −18 | 0.18 ± 0.04 | 1.26 ± 0.29 | +612 |
| Soil | 1.86 ± 0.31 | 3.66 ± 0.70 | 2.45 ± 0.48 | 4.25 ± 0.69 | 2.76 ± 0.09 | 3.35 ± 0.05 | +21 | 2.15 ± 0.29 | 3.96 ± 0.47 | +84 |
| 0–5 cm | 0.95 ± 0.19 | 1.35 ± 0.16 | 0.98 ± 0.23 | 1.15 ± 0.31 | 1.15 ± 0.03 | 1.07 ± 0.05 | −7 | 0.96 ± 0.14 | 1.25 ± 0.16 | +30 |
| 5–10 cm | 0.39 ± 0.11 | 1.06 ± 0.33 | 0.72 ± 0.15 | 1.37 ± 0.23 | 0.72 ± 0.02 | 1.05 ± 0.14 | +45 | 0.55 ± 0.11 | 1.22 ± 0.20 | +119 |
| 10–15 cm | 0.52 ± 0.13 | 1.26 ± 0.24 | 0.75 ± 0.20 | 1.72 ± 0.22 | 0.89 ± 0.13 | 1.24 ± 0.03 | +39 | 0.64 ± 0.12 | 1.49 ± 0.18 | +134 |
| P. mugo | ||||||||||
| Shoots | 45.7 ± 8.0 | 33.2 ± 5.2 | 33.5 ± 5.6 | 36.4 ± 6.2 | 44.4 ± 8.8 | 38.9 ± 7.7 | −12 | 39.6 ± 5.0 | 34.8 ± 3.9 | −12 |
| Roots | 19.26 ± 4.79 | 22.23 ± 3.71 | 31.00 ± 7.93 | 23.11 ± 3.92 | 23.54 ± 5.38 | 31.11 ± 7.99 | +32 | 25.13 ± 4.76 | 22.67 ± 2.58 | −10 |
| 0–5 cm | 5.81 ± 0.95 | 9.94 ± 1.90 | 15.99 ± 5.05 | 10.67 ± 2.17 | 8.78 ± 1.66 | 15.81 ± 4.99 | +80 | 10.90 ± 2.89 | 10.30 ± 1.38 | −6 |
| 5–10 cm | 9.17 ± 3.47 | 7.49 ± 1.55 | 9.42 ± 2.08 | 7.00 ± 0.87 | 9.92 ± 3.15 | 9.08 ± 1.85 | −8 | 9.29 ± 1.93 | 7.25 ± 0.85 | −22 |
| 10–15 cm | 4.28 ± 0.70 | 4.80 ± 0.48 | 5.59 ± 1.42 | 5.44 ± 1.21 | 4.84 ± 0.64 | 6.22 ± 1.25 | +28 | 4.93 ± 0.78 | 5.12 ± 0.63 | +4 |
| Soil | 6.86 ± 0.91 | 6.10 ± 0.97 | 4.59 ± 0.67 | 4.74 ± 0.42 | 7.03 ± 1.29 | 4.99 ± 0.60 | −29 | 5.73 ± 0.64 | 5.42 ± 0.55 | −5 |
| 0–5 cm | 3.04 ± 0.90 | 3.77 ± 1.15 | 2.04 ± 0.36 | 1.92 ± 0.40 | 3.90 ± 1.43 | 2.01 ± 0.31 | −48 | 2.54 ± 0.49 | 2.85 ± 0.64 | +12 |
| 5–10 cm | 2.32 ± 0.40 | 1.15 ± 0.13 | 1.80 ± 0.46 | 1.65 ± 0.39 | 1.83 ± 0.24 | 2.02 ± 0.53 | +10 | 2.06 ± 0.30 | 1.40 ± 0.21 | −32 |
| 10–15 cm | 1.51 ± 0.15 | 1.17 ± 0.26 | 0.76 ± 0.13 | 1.17 ± 0.05 | 1.30 ± 0.19 | 0.96 ± 0.11 | −26 | 1.13 ± 0.15 | 1.17 ± 0.13 | +3 |
| Soil microbes | 4.30 ± 1.51 | 3.86 ± 1.36 | 2.98 ± 1.05 | 2.66 ± 0.84 | 4.93 ± 1.55 | 2.93 ± 1.32 | −41 | 3.64 ± 0.90 | 3.26 ± 0.78 | −10 |
For roots and soil organic matter, data are given as totals and separately for the three depth layers (0–5, 5–10, and 10–15 cm). A labelling run includes a single air temperature but two replicates for each soil temperature. The sum of shoots, roots, and soil is 100 (%) for each air temperature. The standard errors provided are based on the statistical replicates, which are pairs of microcosms with equal soil temperature except for air temperature averages where replicates are labelling runs. Methods and Supporting Information for details.