Effects of heavy metals on organic matter decomposition in inundated soils: Microcosm experiment and field examination

Enya, Osim; Heaney, Natalie; Iniama, Grace E.; Lin, Cheng‐Fang

doi:10.1016/j.scitotenv.2020.138223

Cited by 54 publications

(25 citation statements)

References 43 publications

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“…Variation in compactibility is sensitive to even relatively small changes in the amount of organic matter [29] and after Li application its value decreased (0.4 to 0.6). Moreover, Li application might have inhibited/decreased the microorganism metabolic activity which causes soil organic matter decomposition [30]. Our results are consistent with the findings of Enya et al [30], who also reported that microorganism metabolic activity was lower in heavy metals (Cr, Zn and Pb)-polluted soils.…”

Section: Sodium In Soil Samplessupporting

confidence: 91%

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Investigation of Lithium Application and Effect of Organic Matter on Soil Health

et al. 2021

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The extensive use of lithium (Li) ion-based batteries has increased the contamination of soil and water systems due to widespread dispersal of Li products in the environment. In the current study, the influence of Li application on soil fertility and leachate was observed. Three soil samples were collected and five treatments of Li (0, 50, 100, 150 and 200 mg/L) were applied. After three months of Li treatment, leachate was collected and soil samples were subjected to physical and chemical analyses. The results showed that the mean values of soil pH were increased slightly after Li application while electrical conductivity (EC) ranged from 1.2 to 5.1 µS/cm, indicating that soil was slightly saline in nature. The sodium was observed to be greater than the recommended values (0.3–0.7 mg/kg) in Li-amended soil while calcium and magnesium values decreased in soils compared to untreated soil. Mean values of phosphorus and potassium were greater before Li application and reduced considerably after Li application. Leachate analysis showed that all the parameters differed significantly except those of zinc and iron. The EC of leachate samples ranged from 2286–7188 µS/cm, which shows strong salinity. The sodium adsorption ratio (SAR) ranged from 1–11, which indicates that it falls into the marginal soil category. Lithium concentration in leachate samples ranged from 0–95 mg/L, which was significantly higher than the acceptable value for lithium (2.5 mg/L) in leachate. A soil sample (3) with an additional 10% organic matter showed that after Li application, the loss of nutrients in leachate was less as compared to the other two samples, demonstrating that organic matter improved soil conditions and suppressed the negative effects of Li on soil. Our results could raise concerns about risks in situations where food and fodder crops are associated with Li-contaminated waste disposal.

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Section: Sodium In Soil Samplessupporting

confidence: 91%

“…Moreover, Li application might have inhibited/decreased the microorganism metabolic activity which causes soil organic matter decomposition [30]. Our results are consistent with the findings of Enya et al [30], who also reported that microorganism metabolic activity was lower in heavy metals (Cr, Zn and Pb)-polluted soils.…”

Section: Sodium In Soil Samplessupporting

confidence: 91%

Investigation of Lithium Application and Effect of Organic Matter on Soil Health

et al. 2021

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“…Such defense mechanisms were reported in phytoplankton cultures (Decho and Gutierrez, 2017;Herzi et al, 2013aHerzi et al, , 2013b as well as in natural phytoplankton communities (Rochelle-Newall et al, 2008 or peryphyton biofilm (Ivorra et al, 2000). The binding of chemical compounds on the phytoplankton-derived dissolved organic matter can modify its composition and its physicochemical properties (Naveed et al, 2019) with incidences on its bioavailability and lability (Enya et al, 2020;Wada and Suzuki, 2011), decreasing so the potential utilization by the heterotrophic compartment (Seto et al, 2013), eventually loosening the coupling between both compartments.…”

Section: Bacterio-phytoplankton Coupling and Chemical Contaminationmentioning

confidence: 85%

Impacts of chemical contamination on bacterio-phytoplankton coupling

et al. 2020

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Phytoplankton and bacterioplankton are the key components of the organic matter cycle in aquatic ecosystems, and their interactions can impact the transfer of carbon and ecosystem functioning. The aim of this work was to assess the consequences of chemical contamination on the coupling between phytoplankton and bacterioplankton in two contrasting marine coastal ecosystems: lagoon waters and offshore waters. Bacterial carbon demand was sustained by primary carbon production in the offshore situation, suggesting a tight coupling between both compartments. In contrast, in lagoon waters, due to a higher nutrient and organic matter availability, bacteria could rely on allochthonous carbon sources to sustain their carbon requirements, decreasing so the coupling between both compartments.Exposure to chemical contaminants, pesticides and metal trace elements, resulted in a significant inhibition of the metabolic activities (primary production and bacterial carbon demand) involved in the carbon cycle, especially in offshore waters during spring and fall, inducing a significant decrease of the coupling between primary producers and heterotrophs. This coupling loss was even more evident upon sediment resuspension for both ecosystems due to the important release of nutrients and organic matter. Resulting enrichment alleviated the toxic effects of contaminants as indicated by the stimulation of phytoplankton biomass and carbon production, and modified the composition of the phytoplankton community, impacting so the interactions between phytoplankton and bacterioplankton.

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“…The results of the study are indicative of the low OM content of Andean soils in central Peru, and due to the high and persistent toxicity of Pb improvements should be made so that the soil has at least 5% OM (Enya et al, 2020) recommending fertilization with high Andean cattle manure.…”

Section: Physical-chemical Characteristics Of the Soilmentioning

confidence: 98%

Lead transfer in the soil-root-plant system in a highly contaminated Andean area

Castro-Bedriñana

Chirinos-Peinado

García-Olarte

et al. 2021

PeerJ

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Lead (Pb) is highly toxic heavy metal that is detrimental to the food system. There are large mining and metallurgical companies in the central highlands of Peru that have been active for almost a century and contribute to air, water, and soil pollution, affecting food quality and causing damage to the environment and human health. Our study, conducted in 2018, assessed the content and transfer of lead in the soil-root-plant system in the high Andean grasslands in a geographical area near the metallurgical complex of La Oroya. Lead levels were measured in 120 samples of top soil (0–20 cm), roots, and grass shoots by flame atomic absorption spectroscopy. No significant differences were found between the soil pH, organic matter content, and lead among the samples evaluated (P > 0.05). Mean Pb concentrations decreased in the order of soil > root > shoot (P < 0.01) (212.36 ± 38.40, 154.65 ± 52.85 and 19.71 ± 2.81 mg/kg, respectively). The soil-to-root Pb bioconcentration factor, root-to-shoot translocation factor, and soil-to-shoot bioaccumulation factor values were 0.74 ± 0.26, 0.14 ± 0.06 and 0.10 ± 0.03, respectively. Lead in the soil was 3.03 times higher than the maximum limit for agricultural soil, and was 1.97 times higher than the value limit for fodder. Our findings are important and show that soils and pasture in this geographical area have high Pb levels due to metallurgical emissions that have been occurring since 1922. Such pollution negatively impacts health and the socio-economic status of the exposed populations.

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Effects of heavy metals on organic matter decomposition in inundated soils: Microcosm experiment and field examination

Cited by 54 publications

References 43 publications

Investigation of Lithium Application and Effect of Organic Matter on Soil Health

Investigation of Lithium Application and Effect of Organic Matter on Soil Health

Impacts of chemical contamination on bacterio-phytoplankton coupling

Lead transfer in the soil-root-plant system in a highly contaminated Andean area

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