The effects of earthworm (Lumbricus terrestris) activity on phosphorus availability in an Ontario podzol
Bibliographic record
Abstract
Phosphorus availability in hardwood forest ecosystems growing on acidic, weathered soils is thought to rely on the efficient recycling of mineralized phosphorus through the humus layer. I hypothesized that high levels of earthworm activity in such systems would increase the concentrations of iron- and aluminium-associated phosphorus and reduce the proportion of soil phosphorus in labile inorganic forms by exposing phosphate mineralized from decomposing detritus to fixation by the mineral soil. Using a modified Hedley fractionation, I divided the phosphorus into six fractions of differing biological availability: Resin-P, Bicarb-Pi. Bicarb-Po, NaOH-Pi, NaOH-Po, and HCI-P. The introduction of ' L. terrestris' to podzolic soil in an incubation experiment revealed that earthworm activity, contrary to expectations, did not change the concentration of iron- and aluminium-associated phosphorus (NaOH-Pi) and increased the concentrations of the labile inorganic phosphorus fractions (Resin-P and Bicarb-Pi) as well as the proportion of extracted phosphorus found in these fractions. In addition, earthworm activity decreased the concentration of calcium-associated phosphorus (HCI-P). It is possible that earthworm activity reduced the phosphate adsorption capacity of the soil by increasing the formation of organic-mineral complexes. These findings suggest that earthworm activity could increase phosphorus availability in forest ecosystems.
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 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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".