Belowground carbon turnover in a temperate ombrotrophic bog
Bibliographic record
Abstract
To examine belowground carbon (C) turnover in peatlands, we measured fluxes of carbon dioxide (CO 2 ) and methane (CH 4 ) by chamber measurements, estimated respiration by in situ incubations of peat, and in situ production of dissolved carbon (CO 2 ; CH 4 ; and dissolved organic carbon, DOC) by pore water modeling at an ombrotrophic temperate bog. Ecosystem respiration (ER) averaged 205 mmol m −2 d −1 in summer and was related to temperature, but not water table position, and in situ rates of heterotrophic respiration in the unsaturated zone were also temperature‐dependent, with Q 10 = 5.0 − 6.4. In the saturated zone, concentrations of 0.1 − 2.5 mmol L −1 (CO 2 ), 0 to 0.6 mmol L −1 (CH 4 ), and <10 − 120 mg L −1 (DOC) were recorded. Turnover was dominated by DOC unrelated to respiration, which ranged from <0.5 to 7 mmol m −2 d −1 and amounted on average to < 1% of ER. Peat decomposition constants k d were 0.060 yr −1 to 0.034 yr −1 in the unsaturated and <0.002 yr −1 in the saturated zone. Monthly averages of CH 4 fluxes ranged from 0 to 1.6 mmol m −2 d −1 and were higher than modeled diffusive fluxes when threshold concentrations for CH 4 ebullition were recorded closer to the peatland surface. Our results suggest that the saturated zone is of little relevance to ER in this dry temperate bog and that mobilization of DOC is a potentially more relevant process. Temperature is a more important control on ER than water table position because most of the ER is generated close to the peatland surface. Concurrent, moderate increases in temperature and soil moisture are thus likely to increase losses of CO 2 from ER and of CH 4 from this type of peatland.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".