Arbuscular mycorrhizal fungi and phosphorus-mobilizing microorganisms mediate organic phosphorus cycling in tropical savanna soils
Bibliographic record
Abstract
In highly weathered tropical soils, organic phosphorus (Po) constitutes a primordial reservoir for plant P-nutrition. We studied the dynamics of Po fractions, soil phosphatase activity, and P-mobilizing microflora in root compartments of nonmycorrhizal (rhizosphere and bulk soil) and mycorrhizal (mycorrhizosphere and hyphosphere) Urochloa brizantha plants growing in rhizoboxes with a low P-sorbing Entisol and a high P-sorbing Ultisol from native neotropical savannas. Inoculation with native arbuscular mycorrhizal fungi resulted in an improvement in plant P-status, particularly in the high P-sorbing soil, that coincided with transformations in more recalcitrant P fractions, a higher phosphatase activity and a higher proportion of P-solubilizing and P-mineralizing organisms in mycorrhizal compartments. We provide evidence for a mycorrhizospheric effect in low P-fertility soils that allows plants to access specific P-pools via symbiosis with arbuscular mycorrhizal fungi.
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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 | 0.000 | 0.000 |
| 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 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".