Mycorrhizal communities and their effect on tree growth at a post-mining site/ Les communautés mycorhiziennes et leur effet sur la croissance des arbres sur un site post-minier
Bibliographic record
Abstract
Mycorrhizal symbiosis plays a key role in ecological processes like plant succession through the redistribution of resources among host plants with different needs. Primary succession of vegetation in post-mining areas offers great opportunities to study how mycorrhizal symbiosis influences the revegetation of degraded environments. In this study, we aim to determine how seedling growth is affected by below-ground facilitation via mycorrhizal networks. Specifically, we determine 1) existing mycorrhizal communities, 2) the effect of variables such as host identity and spatial structure on mycorrhizal sharing among hosts and 3) how these mycorrhizal communities, along with other defined physical and biological factors, affect tree growth in a harsh environment. The study site is the mine tailings site of the Beattie Gold Mine near Lake Duparquet in north-western Quebec and two 15 x 15 m plots were inventoried at this site. Betula papyrifera, Populus balsamifera, Picea glauca and Thuja occidentalis were used as focal species and the effect of neighbouring plants was identified. Communities of mycorrhizal fungi were sequenced using molecular markers and analyzed to detect possible species sharing. We identified 474 fungal operational taxonomic units (OTUs) from the fungal DNA amplified samples. Among the 474 OTUs, 52 ectomycorrhizal OTUs and 20 arbuscular mycorrhizal OTUs were identified. Host specificity was not detected as ectomycorrhizal species were shared among all host species and priority effects drove the mycorrhizal community structure of host plant individuals rather than host specificity. \n \nMycorrhizal composition did not vary between plots nor spatially within each plot. Soil nitrogen and phosphorus concentration were extremely low and high arsenic levels were detected in the field. Neighborhood competition indices, soil nitrogen, shoot biomass, mycorrhizal richness, mycorrhizal abundance and sharing of mycorrhizae among host plants did not affect the growth of most host plants. This study concludes that plant-plant interactions (competition or facilitation), mycorrhizal networks and local variations in the concentration of soil nutrients are not important factors for determination of plant growth and vegetalization at our study site due to the harsh environmental conditions. This study helps to develop appropriate strategies for reforestation of boreal forests in mining sites.
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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 | 0.001 |
| 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 | 0.001 | 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".