The effects of commercial thinning treatments on the growth response of black spruce plantations in Northwestern Ontario
Bibliographic record
Abstract
This study examined the temporal growth, yield and mortality responses of mid-rotation, black spruce ( Picea mariana (Mill.) B.S.P.) plantations to varying intensities of commercial thinning. We established 32 one-hectare experimental thinning plots that included replicates of four thinning levels (0%, 25%, 35%, and 50% basal area removals) at two sites that varied in soil type and site quality. Permanent fixed area (400 m 2 ) plots were established, and standard mensuration measurements taken at year 0, 5, 9, 14. Thinning had a variable effect on growth and yield depending on site, thinning intensity, and time after thinning. Periodic annual increment (PAI) of diameter and gross total volume were highest within 5 years of thinning, then declined gradually. Growth responses in diameter of individual trees were positively correlated with tree size, and larger diameter classes contributed more toward increased volume increments in the thinned plots. Although the growth response was relatively short-lived and PAI of gross total volume was negative in thinned stands on the better-quality site by the third measurement period, there was an overall positive effect on yield. Larger diameter trees in thinned stand should allow for size class upgrades and greater economic returns from harvested wood products at final harvest.
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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 | 0.001 | 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 | 0.000 | 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".