Structure of high-elevation, old-growth stands in west-central British Columbia
Bibliographic record
Abstract
We described quantitatively the height distributions of three high-elevation, old-growth stands in the Engelmann Spruce Subalpine Fir zone of west-central British Columbia. The stands were composed of subalpine fir (Abies lasiocarpa (Hook.) Nutt.), with very few Engelmann spruce (Picea engelmannii Parry ex Engelm.) trees; had a two-storied canopy; and were multiaged. The height distributions were quantified by fitting curves to the cumulative frequency distributions. The diameter distributions of the study stands were reverse-J shaped and similar to those of other old-growth Engelmann spruce subalpine fir stands in the Pacific Northwest; however, the height distributions were different, indicating the presence of two canopy layers. We suggest that high-elevation, subalpine boreal, old-growth stands composed of shade-tolerant tree species may display a modal height distribution instead of a reverse-J shape. This structural pattern is suggestive of the transition between the gap-phase and tree-island regeneration models and of the cyclic mode of succession.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 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".