|Titre||Structure of microbial communities in amended and unamended acidgenerating mine wastes along gradients of soil amelioration and revegetation|
|Auteur||Asemaninejad, A; Munford, K; Watmough, S; Campbell, D; Glasauer, S; Basiliko, N; Mykytczuk, N|
|Source||Applied Soil Ecology vol. 155, 103645, 2020 p. 1-11, https://doi.org/10.1016/j.apsoil.2020.103645|
|Séries alt.||Ressources naturelles Canada, Contribution externe 20200116|
|Document||publication en série|
|Media||papier; en ligne; numérique|
|Formats||pdf; html; docx (Microsoft® Word®)|
|SNRC||41I/06; 41I/07; 41I/10; 41I/11|
|Lat/Long OENS|| -81.5000 -80.5000 46.7500 46.2500|
|Sujets||etudes de l'environnement; propriétés minières; résidus miniers; évacuation des déchets liquides; résidus; microorganismes; peuplements biologiques; pollution; substances polluantes; acidité; métaux;
sols; végétation; climat; géochimie des résidus; analyses statistiques; Bassin de Sudbury ; Bacterie; effets cumulatifs; Changement climatique; Site contaminé; Microbiologie; Génétique; Économie et industrie; Nature et environnement; pédologie;
géochimie; Sciences et technologie|
|Illustrations||graphique à barres; graphiques; diagrammes schématiques; tableaux|
|Diffusé||2020 05 23|
|Résumé||(disponible en anglais seulement)|
Understanding the structure of microbial communities in acidic, metal contaminated tailings and waste rock in cool, continental northern temperate climates is
important for identifying their potential for use in phytostabilization and bioremediation programs. In this study, microbial community compositions across two large mine waste sites in the Sudbury basin, Ontario Canada were analyzed along gradients
of barren-to-vegetated tailings and waste rock. Microbial communities were less diverse, more homogenous, and mainly chemolithoautotrophic in barren sites, transitioning to more diverse communities of organoheterotrophs, nitrogen-fixing/plant-growth
promoting bacteria, and ectomycorrhizal fungi in the vegetated areas. Co-occurrence analyses of microbial communities demonstrated higher levels of association among microbial groups in the barren tailings, which were related to the extreme
environmental and chemical conditions and restricted anabolic nutrient availability of the substrates. We also show that vegetation and plant-derived organic matter in the tailings are associated with the shifts observed in the structure of microbial
communities towards more soil-like communities. These changes in microbial communities can improve soil fertility through increased rates of heterotrophic decomposition of plant-derived organic matter, and sequentially further aid in the
establishment of vegetation. These findings will help develop phytostabilization approaches in mine tailings and waste rock in cool, continental northern temperate and boreal climates.
|Sommaire||(Résumé en langage clair et simple, non publié et disponible en anglais seulement)|
This study explored the microbial communities in metal-contaminated mine waste areas in a cold region. The
researchers wanted to understand how these tiny organisms, like bacteria and fungi, change as you go from barren, lifeless areas to places where plants grow.
In the barren sites, they found fewer types of microbes, and they were mainly bacteria
that get their energy from chemicals in the soil. But in the vegetated areas where plants were growing, they discovered more diverse microbial communities. These included bacteria that help plants grow, fix nitrogen, and fungi that form beneficial
relationships with plant roots.
They also saw that barren areas had more interactions among different microbe groups, possibly because the tough conditions force them to work closely together. But as you move to vegetated areas, the communities
become more like typical soil.
This research is important because it helps us understand how to use these microbes to clean up polluted mine waste sites and make the soil healthier for plants to grow. This knowledge can be applied in cold,
northern climates where mining activities can leave behind contaminated waste.