Soil respiration responses to temperature are controlled more by roots than by decomposition in balsam fir ecosystems
Bibliographic record
Abstract
Concern exists that soil respiration (R s ) will increase with global warming, thereby reducing the sink strength of forest ecosystems for carbon (C) or making them sources. We measured R s at three balsam fir (Abies balsamea (L.) Mill.) sites on a climatic gradient from 1997 to 2000 to assess potential responses to global warming. Mean annual R s varied from 0.67 kg C·m -2 ·year -1 at the cool site, to 1.19 kg C·m -2 ·year -1 at the midtransect site, to 1.52 kg C·m -2 ·year -1 at the warm site. Trenched plots were installed in 1999 to partition R s into root respiration (R r ) and heterotrophic respiration (R h ). Differences in trenched-plot respiration (R t ) among sites were much less than differences in R s , because trenching reduced R s at the warm site more than at the cool site. Annual R t was 22% less than annual R s at the cool site, 36% less at the midtransect site, and 50% less at the warm site. After making adjustments for extraordinary decomposition of killed roots in trenched plots, it was estimated that annual R h varied little among sites (0.40 kg C·m -2 ·year -1 at the cool site to 0.54 kg C·m -2 ·year -1 at the warm site), but annual R r varied substantially among sites (0.24 kg C·m -2 ·year -1 at the cool site to 0.98 kg C·m -2 ·year -1 at the warm site). We conclude that R s varied among sites, because climatically driven differences in primary productivity caused greater R r and greater detrital production for R h .
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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".