Structure, spatial distribution and competition in mixed jack pine (<i>Pinus</i> <i>banksiana</i>) stands on clay soils of eastern Canada
Bibliographic record
Abstract
The dynamics of pure jack pine (Pinus banksiana) stands and of those also comprising a component of white birch (Betula papyrifera) and trembling aspen (Populus tremuloides) was assessed in natural post-fire stands on clay soils of eastern Canada boreal mixed woods in order to shed some light on mechanisms controlling composition.Age structures indicated that the presence of birch or aspen merely shortened the establishment of jack pine.Basal area structures of jack pine showed lower skewness coefficients in mixtures with birch than in pure jack pine stands or when mixed with aspen indicating that birch is probably a weaker competitor.Its effect on mean pine diameter probably reflects the lower pine stem density when mixed with birch.Inter-specific competition however had no effect on pine diameter at the tree level.Competition between birch, aspen and pine is avoided by species spatial exclusion measured by Ripley's statistic and reflects the reproductive strategies of the species and history of the site. Ripley's K / asymmetric competition / interspecific competition / composition / stand structureRésumé -Structure, distribution spatiale et compétition dans les peuplements mélangés et purs de pin gris (Pinus banksiana) sur argile dans l'est canadien.Nous avons étudié la dynamique des peuplements de pin gris purs (Pinus banksiana) et mélangés au bouleau à papier (Betula papyrifera) et au peuplier faux-tremble (Populus tremuloides), établis naturellement après un incendie sur sol argileux en forêt boréale mixte de l'est canadien dans le but de mieux comprendre ce qui contrôle leur composition.Les structures d'âge indiquent peu de différence dans le délai d'établissement du pin gris selon la composition.Les surfaces terrières des pins gris montrent de plus faibles coefficients d'asymétrie en mélange avec le bouleau qu'avec le peuplier, ce qui laisse à penser que le bouleau est un plus faible compétiteur.L'effet du bouleau sur le diamètre moyen du pin reflète la plus faible densité du pin en peuplements mélangés à du bouleau.La compétition interspécifique n'a cependant pas affecté le diamètre du pin à l'échelle de l'arbre.La compétition interspécifique est évitée par l'exclusion spatiale des espèces mise en évidence par la statistique de Ripley, ce qui reflète leur stratégies reproductives et l'historique du site. statistique K de Ripley / compétition asymétrique / compétition interspécifique / composition / structure des peuplements
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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 | 0.000 |
| 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".