Growth Inhibitory Effects of Salal on Western Hemlock and Western Red Cedar
Bibliographic record
Abstract
Salal ( Gaultheria shallon Pursh) regenerates vigorously after harvesting in the cedar–hemlock (CH) forests of coastal British Columbia, Canada. Eight years after harvesting, regenerating conifers on salal‐dominated sites exhibited stunted growth and chlorotic foliage. The potential inhibitory effect of salal on hemlock was tested by germinating and measuring the primary growth of seedlings in the presence of salal litter and different concentrations of the litter leachate. Effects of aboveground and belowground competition of salal and its presumed growth inhibitory effects on western hemlock [ Tsuga heterophylla (Raf.) Sarg.] and western red cedar ( Thuja plicata Donn ex D. Don) were tested with pot experiments under greenhouse conditions. Seed germination and primary growth of hemlock seedlings were not significantly affected by water leachates of salal leaf or litter, nor were they affected when grown directly on partially decomposed salal litter. The primary root growth of hemlock seedlings was significantly increased in CH humus. Salal litter had no significant effect on hemlock and cedar seedlings. Combined aboveground and belowground competition from salal had the strongest negative effects on both hemlock and cedar, causing significant reductions in stem height, basal diameter, and biomass. Belowground competition from salal affected the conifers more than aboveground competition. The results suggest that the growth inhibitory effect of salal on conifers is primarily due to competition for nutrients rather than allelopathic effects of litter.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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 | 0.000 | 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) | 0.000 | 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 teacher head, 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".