Testing the growth limitation hypothesis for subarctic Scots pine
Bibliographic record
Abstract
Summary 1. We tested if tree line trees are sink or resource limited by comparing the reactions in Scots pine trees (Pinus sylvestris L.) to changes in resource availability (through nutrient addition and defoliation), and in sink strength (through debudding) in north‐eastern Finland. 2. Height extension growth increased by over 200% and shoot extension growth by 27%, as a result of nutrient addition, whereas changes in radial increment were smaller and not statistically significant. 3. Although in defoliated trees height and shoot extension were not significantly affected, defoliated trees decreased their radial growth by 50%. 4. Branch extension growth of the remaining buds was increased due to debudding treatment by 47%, but there were no changes in radial increment. 5. Non‐structural carbohydrate concentrations in twigs, however, remained relatively constant in all treatments. 6. There were no statistically significant changes in carbon isotope ratio due to any of the treatments, indicating that the manipulation treatments did not modify tree water relations. 7. Synthesis. Our results do not support the growth limitation theory for tree line trees and suggest that resource limitations might be more important.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| 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) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".