Effects of Cambial Age and Stem Height on Wood Density and Growth of Jack Pine Grown in Boreal Stands
Bibliographic record
Abstract
Jack pine specimens were examined for longitudinal and radial variations in selected wood quality parameters.Wood density and ring width of cross-sections were measured systematically from pith to bark along the merchantable stem using X-ray densitometry.Effects of cambial age and stem height were analyzed using a linear mixed model with two levels of nesting.A strong interaction between the two factors was found in corewood.Tree individual variation increased with cambial age for all studied wood properties and was larger in earlywood than in latewood.Radial patterns in the studied parameters closely approximated published ones in the lower stem but lessened considerably with increasing stem height.By contrast, longitudinal patterns reversed with cambial age in earlywood.High coordination was found between longitudinal patterns in corewood and radial patterns in the stem base, indicating a similar maturation pattern in the apical meristem and cambia.However, with increasing cambial age, this high coordination disappeared rapidly.
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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 | 0.000 | 0.001 |
| 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) | 0.001 | 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".