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In the published article, the layout of table 1 was incorrect. The table should appear as follows.
Table 1.
| Site | Est time since thaw, y | Relative elev., m | Average feature size, m2 | Total terrestrial peat C stock, kg C m−2a | Fraction bog peat | Sept. albedob | NEE, mg CO2 –C m−2 d−1 | CH4 flux, mg CH4 –C m−2 d−1 | ER, mg CO2 –C m−2 d−1 | Flux ratio, CH4/ -NEE | Sept. CH4 ebullition at 20 cm for 24 h, mg m−2 d−1 | Dominant vegetation | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mayc | Julyc | Septc | Mayc | Julyc | Septc | Mayc | Julyc | Septc | ||||||||||
| Frozen plateau | 0 | 0 | na | 61.3 ± 15.8 | 0.00 ± 0.00 | 0.14 ± <0.01 | −1213 ± 341 | −1032 ± 870 | −604 ± 433 | −0.12 ± 0.09 | −0.97 ± 1.24 | 0.95 ± 11.8 | 1232 ± 255 | 1659 ± 476 | 501 ± 88 | 0.00 | — | Picea mariana, Rhododendron subarcticum, Rubus chamaemorus Cladonia arbuscula, Sphagnum fuscum |
| Young bog | 14–21 | −1.3 ± 0.3 | 2.0 ± 0.6 | 25.9 ± 16.5 | 0.09 ± 0.06 | 0.18 ± 0.01 | −1463 ± 1059 | −652 ± 421 | −412 ± 320 | −0.18 ± 0.27 | 1.37 ± 0.67 | 2.87 ± 2.11 | 1624 ± 17.6* | 548 ± 223* | 299 ± 82 | 0.00 –0.01 | 8.0 | Sphagnum riparium, S. lindbergii |
| Int. bog | 22–68 (<100) | −2.6 ± 0.1 | 244 ± 82 | 42.3* ± 24.2 | 0.14 ± 0.03 | 0.13 ± <0.01 | −838 ± 577 | −1513 ± 1205* | −1038 ± 349 | 15.9 ± 11.6 | 123 ± 71** | 72.9 ± 37.8** | 640 ± 218* | 1811 ± 740* | 774 ± 164 | 0.02–0.08 | 51.9 | Eriophorum scheuchzeri, Sphagnum riparium, S. lindbergii |
| Old bog | 200–1400 | −2.1 ± 0.2 | 530 ± 182 | 64.3 ± 27.4 | 0.74 ± 0.14 | 0.15 ± 0.01 | −222 ± 514 | −206 ± 698* | −608 ± 451 | 1.16 ± 1.27 | 6.55 ± 2.23 | 6.75 ± 2.99 | 1488 ± 419 | 1553 ± 530 | 499 ± 128 | 0.01 –0.03 | 65.3 | Andromeda polifolia, Oxycoccus microcarpus, Carex rotundata, Sphagnum balticum, S. flexuosum |
| Fen | 300–1300 (<1700) | −2.8 ± 0.1 | na | 48.0 | — | 0.14 ± <0.01 | 234 ± 337 | −874 ± 241 | — | 11.2 ± 4.49 | 38.3 ± 11.5 | 33.3 ± 21.0 ab | 791 ± 207 | 508 ± 310* | −0.05 –0.04 | 65.9 | Carex limosa, C. rotundata, Eriophorum scheuchzeri, Sphagnum papillosum, S. majus, S. fallax, Menyanthes trifoliata | |
an = 1 for the fen site ; n = 3 for the young bog, intermediate bog, and old bog; n = 6 for frozen plateau. Mean and one standard deviation for three frozen, forested plateau sites is 53.8 ± 9.6 kg C m−2. Value shown for frozen plateau includes three drying margin locations at bog edges representing ice free carbon inventory of forested plateaus (total n = 6). bAlbedo estimates for the frozen plateau and young bog sites refer to the forest floor and exclude any overlying trees. cMean and one standard deviation for flux measurements on each trip (May, July, September). Within each trip, we evaluated the statistical effect of site type on the measured gas fluxes using a mixed effects model as described in the main text, at a significance level of p < 0.05. *July NEE differed significantly between intermediate and old bogs but was not otherwise significantly different among sites. In May, ER was significantly lower at intermediate bogs compared to young bogs, and in July, ER was significantly lower at young bog and fen sites compared to intermediate bogs. **July and September CH4 emissions were significantly higher at intermediate bogs than at all other sites during those campaigns.