Little Halophyte on the Prairie: Canadian Salt-Tolerant Plants as Remediation Tools for Salinized Soils in Western Canada
Bibliographic record
Abstract
In western Canada’s prairies, secondary soil salinization is contributing to groundwater contamination, soil degradation, and plant toxicity. To remediate salt-contaminated sites, a non-invasive, resource-efficient method is required. Phytoremediation with salt-tolerant plants (halophytes) is a strong alternative to conventional site clean-up methods, as plants will continuously extract salts from soil whilst improving soil structure. Three native (Bouteloua gracilis, Bouteloua curtipendula, Distichlis spicata) and three naturalized (Puccinellia distans, Atriplex patula, Chenopodium album) halophytes were grown under controlled greenhouse conditions with salt concentrations of 1500 µg/g Cl- to quantify salt extraction from contaminated soil originating from a legacy site. Based on the results obtained, A. patula, C. album, P. distans, and B. gracilis were further studied under greenhouse conditions at extremely high salt concentrations (10,500 µg/g Cl-) and accumulated 333, 176, 6.49 and 2.43 mg Cl-/shoot DW respectively. Under ideal conditions, it would take the accumulator halophyte species A. patula and P. distans ~1.3 and ~2.4 years, respectively, to remediate the site. Proof-of-concept for phytoremediation studies is needed to validate the method, hence field studies were undertaken with seven halophyte species at the legacy site using raised bed ‘mesocosms’ spiked to 10,500 µg/g Cl-. Halophyte chloride accumulation and biomass production did not significantly differ between an unamended mesocosm and one amended with 30% (by volume) triple mix. Halophyte species accumulated 0.106 – 4.27 mg Cl-/shoot DW in the field, despite climatic extremes, with opportunistic species A. fatua, T. officinale, and C. arvense accumulating even higher quantities (1.44 – 88.8 mg Cl-/shoot DW). Since recretohalophytes demonstrated minimal excretion rates in the greenhouse and the field, all three Bouteloua species, D. spicata, and Sporobolus michauxianus were grown in salt-spiked soil and excreted crystals were imaged using scanning electron microscopy. D. spicata excreted smaller salt crystals at a higher density than the larger salt crystals of S. michauxianus, and on the basis of total surface area D. spicata excreted four times as many crystals. Overall, the results of the studies undertaken indicate that the use of native and/or naturalized accumulator halophytes are justifiable in terms of efficacy to remediate salt-affected legacy sites in western Canada.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".