Microbial endophytes and compost improve plant growth in two contrasting types of hard rock mining waste

Creamer, Courtney A.; Leewis, Mary-Cathrine; Governali, Francesca C.; Freeman, John L.; Gray, Floyd; Wright, Emily G.; Foster, Andrea L.

doi:10.1080/15226514.2022.2109587

Cited by 4 publications

(21 citation statements)

References 36 publications

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“…The addition of dolomite (35.34 mg per gram of tailings) increased the pH 1:5 from 3.5 to 5.1, increased the concentrations of total Ca (0.7 to 1.4%) and Mg (0.4 to 0.8%), and added 0.4% inorganic carbon. It also increased water-extractable calcium by 200 mg L − 1 and halved the water extractability of Ag, Al, As, Cu, and Fe (Creamer et al 2022b). Municipal waste compost (predominantly green waste) was collected prior to the experiment from the Shoreway Environmental Center (San Carlos, CA).…”

Section: Soil Amendmentsmentioning

confidence: 96%

“…Water-soluble concentrations of Cd, Pb, Mn, and Zn also exceed surface water regulatory limits (Arizona Department of Environmental Quality 2019). Moreover, at least 60% of the Cd and Mn-and 90% of the Pb-in the tailings are soluble, exchangeable, or associated with amorphous Fe and Al phases, indicating these elements are potentially mobile and bioavailable to plants (Creamer et al 2022b).…”

Section: Polymetallic Mine Geology and Tailings Characteristicsmentioning

confidence: 99%

“…Dolomite was added to the tailings because B. curtipendula does not germinate well at pH values < 5.0 (Creamer et al, 2022a). Dolomite (52% CaCO 3 and 35% MgCO 3 ; Organic Garden Lime, Espoma, Millville, NJ) was ground to < 63 µm in a tungsten Shatterbox and mixed into the tailings (100X vertical rotation end over end).…”

Section: Soil Amendmentsmentioning

confidence: 99%

“…Although overall changes in solid phase concentrations of potentially toxic minor and trace elements in the tailings resulting from compost and/or endophyte additions were relatively modest (i.e., changed by less than 10% by the treatments), solid phase concentrations of Pb in the tailings-along with Cu, Fe, and Zn-were lower in pots with endophyte-coated B. curtipendula seeds (0.001 ≤ P ≤ 0.01; gure in Online Resource 1). The concentrations of these elements are highly correlated in the tailings (Pearson's r ≥ 0.75) because Cu, Pb, and Zn bearing mineral phases are associated with Fe and/or S in these tailings that contained plumbojarosite, chalcopyrite, and sphalerite (Creamer et al, 2022b). A compost topdressing did not impact the solid phase concentrations of potentially toxic trace elements in the tailings (P[perm] ≤ 0.82), but there was mobilization of Cd (1 to 3 mg kg − 1 ), Cu (35 to 50 mg kg − 1 ), Mn (200 to 800 mg kg − 1 ), and Pb (20 to 200 mg kg − 1 ) into the compost layer during the experiment (Online Resource 1).…”

Section: Toxic Minor and Trace Elements Were Mobilized During The Exp...mentioning

confidence: 99%

“…Both these functions can enhance the mobilization of metal(loids) in mine waste by chelating iron (siderophores) or solubilizing minerals by phosphate solubilization(Ma et al 2016). Copper, Pb, and Zn are held in Fe-bearing phases in these tailings(Creamer et al 2022b).…”

mentioning

confidence: 99%

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A combined compost and endophyte addition improves phytostabilization by a native perennial grass in metal contaminated mine tailings

Creamer

Leewis²,

Kracmarova-Farren³

et al. 2023

Preprint

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Background and Aims: Re-vegetation of contaminated and disturbed landscapes can reduce the transport of toxic elements while improving soil fertility. This study evaluated whether the planting of a perennial grass with diazotrophic microbial endophytes and municipal waste compost—alone and in combination—improved phytostabilization of potentially toxic trace elements in dolomite-amended tailings from a historically mined polymetallic mineral deposit.Methods We grew Bouteloua curtipendula seedlings in tailings with hazardous concentrations of As, Cd, Pb, Mn, and Zn. We evaluated how plant growth, organic matter accumulation, and minor and trace element mobilization responded to microbial endophyte and organic amendments.Results Although most of the added endophytes were not uniquely identified, the best plant growth and fertility outcomes were achieved with a combination of amendments: dolomite to reduce acidity, a compost topdressing to accumulate nitrogen in the tailings, and a mixed consortium endophyte seed coating to synergistically increase organic carbon and grass biomass yields. Combining amendments also improved phytostabilization: compost reduced the shoot forage toxicity of B. curtipendula seedlings without reducing phytostabilized contaminant yields in the rhizosphere, while endophyte inoculated grass marginally reduced total and water-extractable concentrations of toxic trace elements through enhanced mobilization.Conclusion The most effective means of reclaiming these acidic, polymetallic tailings is with a simultaneous dolomite, compost, and endophyte seed treatment.

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Section: Soil Amendmentsmentioning

confidence: 96%

Section: Polymetallic Mine Geology and Tailings Characteristicsmentioning

confidence: 99%

Section: Soil Amendmentsmentioning

confidence: 99%

Section: Toxic Minor and Trace Elements Were Mobilized During The Exp...mentioning

confidence: 99%

mentioning

confidence: 99%

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A combined compost and endophyte addition improves phytostabilization by a native perennial grass in metal contaminated mine tailings

Creamer

Leewis²,

Kracmarova-Farren³

et al. 2023

Preprint

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A combined compost, dolomite, and endophyte addition is more effective than single amendments for improving phytorestoration of metal contaminated mine tailings

Creamer,

Leewis,

Kracmarova-Farren

et al. 2023

Plant Soil

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Background and aims Re-vegetation of mining-impacted landscapes reduces transport of toxic elements while improving soil fertility. This study evaluated whether the planting of a native perennial grass with a consortium of diazotrophic microbial endophytes and municipal waste compost—alone and in combination—enhanced plant growth while stabilizing metal(loids) in dolomite-amended tailings from a historically mined polymetallic mineral deposit. Methods We grew Bouteloua curtipendula seedlings in tailings with hazardous concentrations of As, Cd, Pb, Mn, and Zn. We evaluated how plant growth, organic matter accumulation, and major, minor, and trace element mobilization and phytostabilization responded to microbial endophyte and/or compost amendments after the 45-day growth experiment. Results Although most of the added endophytes were not uniquely identified, the best plant growth and fertility outcomes were achieved with a combination of amendments: dolomite to reduce acidity, compost to increase nitrogen, and a mixed consortium endophyte seed coating to synergistically increase organic carbon and grass biomass yields. Compost reduced shoot and root concentrations—but not yields—of contaminant metals. Endophytes increased foliar Cd, Co, Mn, and Pb yields but mobilized Pb and Zn from the tailings. Root stabilization of Cd, Co, Mn did not require amendments. Conclusion The most effective means of revegetating these acidic, polymetallic tailings with the native B. curtipendula is with a simultaneous dolomite, compost, and endophyte seed treatment. Due to potential phosphate solubilization and siderophore production by this consortium of endophytes, strategies to capture solubilized metal(loids) may be needed for sulfidic tailings with metal(loids) associated with mobile mineral phases.

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Bioremediation of heavy metals contaminated industrial effluents by endophytes and their mechanisms

Harsonowati,

Nurrahma,

Shah

et al. 2024

Bio-Organic Amendments for Heavy Metal Remediation

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Microbial endophytes and compost improve plant growth in two contrasting types of hard rock mining waste

Cited by 4 publications

References 36 publications

A combined compost and endophyte addition improves phytostabilization by a native perennial grass in metal contaminated mine tailings

A combined compost and endophyte addition improves phytostabilization by a native perennial grass in metal contaminated mine tailings

A combined compost, dolomite, and endophyte addition is more effective than single amendments for improving phytorestoration of metal contaminated mine tailings

Bioremediation of heavy metals contaminated industrial effluents by endophytes and their mechanisms

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