Proximity to a stand edge influences growth of advance and planted Pacific silver fir seedlings
Bibliographic record
Abstract
Growth and physiology of advance regeneration, present in the understorey before harvest, and planted seedlings of Pacific silver fir (Abies amabilis) were compared in three environments created by increasing distance from an edge of a montane clearcut on Vancouver Island, British Columbia, Canada. The objective was to quantify growth limitations and their underlying mechanisms in relation to light and nutrient availability. The site was clearcut in 1989. In 1993, plots were established 5-10 m inside the north-east facing stand edge, and 12-17 and 60-65 m into the adjoining clearcut. Microclimate data were collected, and biomass allocation, specific leaf area, and net photosynthesis of advance and planted seedlings in the plots were measured in 1993. Height growth and foliar nitrogen concentration of advance and planted seedlings were measured over a 5 year period. Light and air temperature increased from the inside edge environment into the clearcut. Soil moisture did not differ greatly among environments. Seedlings of both regeneration types grew tallest in the clearcut, and specific leaf areas were lower in the clearcut. In 1993, root:shoot ratios and rates of net photosynthesis were greater in advance than planted seedlings. Planted seedlings were significantly taller than advance regeneration by 1998, 5 years after establishment, however, this size difference was due mainly to the larger starting size of planted seedlings. By 1998, foliar nitrogen concentrations did not differ between regeneration types. Foliar nitrogen concentrations were low in all environments, which supports the contention that growth check of Pacific silver fir in montane clearcuts is associated with nitrogen deficiency.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 0.000 |
| 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".