Examination of long-term soil development and phosphorus dynamics in a hypermaritime chronosequence, Calvert Island, British Columbia, Canada
Bibliographic record
Abstract
This thesis examines soil development, phosphorus (P) dynamics and ecosystem succession in an aeolian sand dune chronosequence spanning 10,760 years on Calvert Island, in hypermaritime coastal British Columbia, Canada. After 100 years of soil development, thick forest floors have developed (~28 cm), and after ~3,500 years mature Podzols have formed with cemented placic and ortstein horizons. With increasing soil age, mineral soil total P declines linearly and organic P forms become increasingly dominant, with glycerophosphates dominating organic horizons, and inositol hexakisphosphates and DNA dominating mineral horizons on the older sites. After 7,000 years, ecosystem retrogression – a long-term decline in biomass – is suggested by reduced tree basal area and a shift towards shrubby, more stress-tolerant species such as Pinus contorta var contorta and Tsuga mertensiana. Retrogression in the Calvert Island chronosequence is most likely caused by formation of cemented horizons and declining soil P reserves, though further investigation is needed.
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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 | 0.002 | 0.003 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".