Microbial responses to the biostimulation of Subartic hydrocarbon-contaminated soil under seasonal freeze-thaw conditions
Bibliographic record
Abstract
Nutrient-deficient, acidic soil from Resolution Island, Nunavut was contaminated with petroleum hydrocarbons during operations from 1954-1973 at a former radar station.Two mesocosm tanks containing ~200 kg hydrocarbon-contaminated Resolution Island soil each were exposed to a seasonal freezing profile designed to simulate in situ ground conditions after the summer landfarming season.Soil from one tank was treated with 100.0 mg N kg -1 soil and 2.0 g CaCO 3 kg -1 soil, while the second mesocosm remained untreated.Aliphatic nC10-nC16 hydrocarbon biodegradation was enhanced by soil treatments after an initial acclimation period, which corresponded to Actinomycetales and Rhodanobacter population growth from 2.4ºC to -2.1ºC.These Actinomycetales and Rhodanobacter populations probably represented hydrocarbonoclastic K-strategists and hydrocarbon metabolite-utilizing r-strategists, respectively.Additionally, a novel indigenous archaeal community was related to Thaumachaeota ammonia oxidizers but not associated with hydrocarbon biodegradation.Two diazotrophic Burkholderia isolates from the soil also degraded 14 C-naphthalene and/or 14 C-phenanthrene at -5°C.iiiRésumé Une terre acide pauvre en éléments nutritifs provenents de Resolution Island, Nunavut, a été contaminé par des hydrocarbures pétroliers durant les opérations d'une ancienne base de radar entre 1954 -1973.Deux réservoirs mésocosmes contenant ~200 kg de terre de Resolution Island contaminée par des hydrocarbures ont été sujet à un profil saisonnier de gel et dégel conçu pour simuler les conditions du sol in situ après la saison estivale d'exploitation.La terre dans un réservoir a été traite avec 100.0 mg N kg -1 de terre et 2.0 g CaCO 3 kg -1 de terre, tandis que le deuxième réservoir n'a reçu aucun traitement.La biodégradation d'hydrocarbures aliphatiques (nC10 à nC16) a été stimulée par l'ajout d'éléments nutritifs après une période initiale d'acclimatisation, qui correspondait à une croissance des populations Actinomycetales et Rhodanobacter de 2.4ºC à -2.1ºC.Ces populations Actinomycetales et Rhodanobacter ont probablement représenté des K-stratégistes hydrocarbonoclastes et des r-stratégistes utilisant des métabolites d'hydrocarbures, respectivement.De plus, la communauté originale indigène d'archaea était apparentée aux oxydeurs d'ammoniac Thaumachaeota, mais n'était pas associée avec la biodégradation d'hydrocarbures.Deux isolats Burkholderia diazotrophiques de la terre ont aussi dégradé du 14 C-naphtalène et/ou du 14 Cphénanthrène à -5°C.
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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) | 0.001 | 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".