Performance and physiology of large containerized and bare-root spruce seedlings in relation to scarification and competition in Qu�bec (Canada)
Bibliographic record
Abstract
In Québec (Canada), the use of large planting stock is being applied in combination with scarification, since herbicide use is forbidden in public forest.Large containerized and bare-root stock of black spruce were planted on two sites located within the sub-boreal mixedwood region of eastern Québec.We analyzed data to detect main effects and interactions among scarification, competing vegetation and stock type on seedling growth and physiology during the first three growing seasons.Scarification did not improve seedling water relations, third-year height and ground-level diameter, and foliar nutrient concentration.After three years, the two stock types showed similar water relations and nutritional status but the large containerized seedlings performed slightly better than the large bare-root stock in terms of diameter and height growth.Competing vegetation greatly reduced seedling diameter, foliar-N concentration, compared to competition-free seedlings.We discuss results in relation with treatment effects on above-and belowground resource availability to newly planted conifers.scarification / competing vegetation / large seedling / growth / xylem water potential Résumé -Performance et physiologie de plants de fortes dimensions d'épinette produits en récipients et à racines nues en relation avec le scarifiage et la végétation compétitive au Québec (Canada).Au Québec (Canada), l'utilisation de phytocides chimiques est proscrite en forêt publique.Le reboisement de plants de fortes dimensions (PFD) est pratiqué, en combinaison avec le scarifiage, sur les stations à haut risque de compétition.Des PFD d'épinette noire en récipients (RC) et à racines nues (RN) ont été plantés sur deux sites afin d'évaluer les effets du scarifiage, de la compétition, du type de plant et de leurs interactions sur l'établissement des plants pendant les trois premières saisons de croissance.Le scarifiage n'a pas d'effet marqué sur les dimensions et la physiologie des semis après trois ans.Les deux types de PFD présentent, après trois saisons, des relations hydriques et des statuts nutritifs équivalents.Les RC atteignent des dimensions légèrement supérieures à celles des RN.La végétation a peu d'impacts sur la croissance en hauteur, mais affecte négativement le diamètre et le statut nutritif.Nous discutons des résultats à l'égard de leurs effets sur la disponibilité des ressources environnementales pour les plants. scarifiage / végétation compétitive / plant de fortes dimensions / croissance / potentiel hydrique du xylème
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".