Microclimate studies in uniform shelterwood systems in the Sub-Boreal Spruce zone of Central British Columbia.
Bibliographic record
Abstract
In the Sub-Boreal Spruce, dry warm (SBSdw) biogeoclimatic subzone, on the interior plateau of British Columbia, frost is a limiting factor for the establishment and growth of Douglas-fir (Pseudotsuga menziesii). A research trial, using a uniform shelterwood silvicultural system, was harvested in 1991 and 2001 to test how residual basal area retention effected regeneration establishment, growth and condition. Microclimate stations were installed in two residual basal area treatments (15 m2 and 20 m2), to measure frost events. Near ground air and soil temperatures were monitored on two paired sites of 20 m2 and 15 m2, and one additional replicate of 20m, plus one clearcut, from 2001 to 2008. Minimum air temperatures and total duration (minutes) of air temperatures below 0° C were compared between treatments during the bud flushing (15 May 31 July) and bud set (15 August 30 September) seasons. The clearcut site had a significantly longer duration of sub-freezing minutes than the forest sites for both bud flushing and bud set periods; as well as a greater number of frosts and lower extreme minimum temperatures. Differences between the 15 and 20 m treatments were not as great; however, both 15 m sites had longer duration of sub-freezing minutes and increased numbers of frosts in comparison to the nearby 20 m treatments. Sky view factor increased with decreased residual basal area, and it was positively correlated with the duration of sub-freezing minutes. There were few significant frost events during the June to midAugust period in the forested sites, during the 7 year study. The data suggest that residual basal areas at 15 m or greater provide adequate frost protection for regeneration.
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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 | 0.002 | 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".