Low soil temperature inhibits the stimulatory effect of elevated [CO <sub>2</sub> ] on height and biomass accumulation of white birch seedlings grown under three non‐limiting phosphorus conditions
Why this work is in the frame
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Bibliographic record
Abstract
White birch ( Betula papyrifera Marsh.) seedlings were exposed to ambient or doubled ambient carbon dioxide concentration ([CO 2 ]), three soil temperatures ( T soil ) (low, intermediate, high), and three phosphorus (P) regimes (low, medium, high) in environment‐controlled greenhouses. Height ( H ), root‐collar diameter (RCD), biomass, and leaf phosphorus concentration (leaf P) were determined four months after initiation of treatments. The low T soil reduced H , RCD, shoot biomass, root biomass and total seedling biomass whereas the high‐P level and the [CO 2 ] elevation increased all the growth and biomass parameters. Elevated [CO 2 ] significantly reduced leaf P. There were significant two‐factor interactions suggesting that the effect of elevated [CO 2 ] on (1) H , total biomass, biomass of plant components, and leaf P was dependent on T soil , (2) total biomass was contingent on P regime. For instance, the positive response of H and total biomass to elevated [CO 2 ] was limited to seedlings raised under the intermediate and high T soil , respectively. In addition, [CO 2 ] elevation increased total biomass only at the high‐P regime but not at the low‐ or medium‐P level where the effect of [CO 2 ] was statistically insignificant. No significant main effect of treatment or interaction was observed for root to shoot biomass ratio.
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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 | 0.001 | 0.000 |
| 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 it