Remediation Agents Drive Bacterial Community in a Cd-Contaminated Soil

Cui, Wenzhi; Liu, Yingying; Li, Wenguang; Pei, Lei; Xu, Shuang; Sun, Yuhuan; Li, Jianbo; Wang, Fayuan

doi:10.3390/toxics11010053

Cited by 10 publications

(5 citation statements)

References 97 publications

(110 reference statements)

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“…The speciation of heavy metals in the soil determines their effectiveness and content in plant tissue. Immobilization of metals reduces the uptake of heavy metals by plants, thereby reducing their accumulation in crops and minimizing potential health risks associated with metal transfer through the food chain [15,35]. In this study, the proportion of residual Cd and Pb was significantly increased by the addition of biochar.…”

Section: Discussionmentioning

confidence: 63%

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Remediation of Cadmium and Lead in Mine Soil by Ameliorants and Its Impact on Maize (Zea mays L.) Cultivation

Chen,

Wang,

et al. 2024

Agronomy

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The soil in a lead–zinc mining area, contaminated with heavy metals like cadmium (Cd) and lead (Pb), poses a risk to crops such as maize. Experiments using biochar and sepiolite as soil ameliorants in potted maize showed these substances can mitigate heavy metal contamination. Biochar increased potassium and phosphorus in the soil and maize, while sepiolite significantly boosted overground phosphorus by 73.2%. Both ameliorants transformed Cd and Pb into a more stable state in the soil, reducing their accumulation in maize, especially with biochar, which effectively inhibited metal migration during leaching events. This study provided insights for further improvement of soil amendments and multi-factor application experiments.

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Section: Discussionmentioning

confidence: 63%

“…The porous structure and oxygen-rich functional groups of biochar enable efficient adsorption of heavy metals, dyes, phosphates, etc. [15][16][17][18]. Biochar can be obtained from various sources, such as through the high-temperature pyrolysis of plants or agriculture, to achieve effective utilization of waste resources [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Remediation of Cadmium and Lead in Mine Soil by Ameliorants and Its Impact on Maize (Zea mays L.) Cultivation

Chen,

Wang,

et al. 2024

Agronomy

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“…The redox potential (Eh) was assessed with FJA-6 ORP depolarization automatic analyzer 36 , while the cation exchange capacity (CEC) of soil was estimated by hexamine cobalt trichloride leaching-spectrophotometry 37 . The available Cu and Cd contents in soil were determined using DTPA-CaCl 2 -TEA system and atomic absorption spectrometry 38 . Following the BCR sequential extraction scheme, the soil Cu and Cd forms were classified into the weak acid soluble, reducible, oxidizable and residual states 39 .…”

Section: Methodsmentioning

confidence: 99%

Extraction of heavy metals from copper tailings by ryegrass (Lolium perenne L.) with the assistance of degradable chelating agents

Wang,

Xue,

Zhang

et al. 2024

Sci Rep

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Heavy metal contamination is an urgent ecological governance problem in mining areas. In order to seek for a green and environmentally friendly reagent with better plant restoration effect to solve the problem of low efficiency in plant restoration in heavy metal pollution soil. In this study, we evaluated the effects of three biodegradable chelating agents, namely citric acid (CA), fulvic acid (FA) and polyaspartic acid (PASP), on the physicochemical properties of copper tailings, growth of ryegrass (Lolium perenne L.) and heavy metal accumulation therein. The results showed that the chelating agent application improved the physicochemical properties of copper tailings, increased the biomass of ryegrass and enriched more Cu and Cd in copper tailings. In the control group, the main existing forms of Cu and Cd were oxidizable state, followed by residual, weak acid soluble and reducible states. After the CA, FA or PASP application, Cu and Cd were converted from the residual and oxidizable states to the reducible and weak acid soluble states, whose bioavailability in copper tailings were thus enhanced. Besides, the chelating agent incorporation improved the Cu and Cd extraction efficiencies of ryegrass from copper tailings, as manifested by increased root and stem contents of Cu and Cd by 30.29–103.42%, 11.43–74.29%, 2.98–110.98% and 11.11–111.11%, respectively, in comparison with the control group. In the presence of multiple heavy metals, CA, FA or PASP showed selectivity regarding the ryegrass extraction of heavy metals from copper tailings. PCA analysis revealed that the CA-4 and PASP-7 treatment had great remediation potentials against Cu and Cd in copper tailings, respectively, as manifested by increases in Cu and Cd contents in ryegrass by 90.98% and 74.29% compared to the CK group.

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“…In practice, biochar is commonly used with supplemental nutrients, such as organic fertilizer, to enhance soil quality, mitigate heavy metal stress, and increase crop productivity (Muhammad et al, 2017;Saeed et al, 2021). Notably, this fertilization method is often accompanied by changes in the soil bacterial community (Wei et al, 2020;Liu et al, 2022;Wen et al, 2023). However, to date, the alterations and effects of the soil bacterial community in most soil remediation processes are still poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Biochar and organic fertilizer drive the bacterial community to improve the productivity and quality of Sophora tonkinensis in cadmium-contaminated soil

Liu,

Li,

Lin

et al. 2024

Front. Microbiol.

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Excessive Cd accumulation in soil reduces the production of numerous plants, such as Sophora tonkinensis Gagnep., which is an important and widely cultivated medicinal plant whose roots and rhizomes are used in traditional Chinese medicine. Applying a mixture of biochar and organic fertilizers improved the overall health of the Cd-contaminated soil and increased the yield and quality of Sophora. However, the underlying mechanism between this mixed fertilization and the improvement of the yield and quality of Sophora remains uncovered. This study investigated the effect of biochar and organic fertilizer application (BO, biochar to organic fertilizer ratio of 1:2) on the growth of Sophora cultivated in Cd-contaminated soil. BO significantly reduced the total Cd content (TCd) in the Sophora rhizosphere soil and increased the soil water content, overall soil nutrient levels, and enzyme activities in the soil. Additionally, the α diversity of the soil bacterial community had been significantly improved after BO treatment. Soil pH, total Cd content, total carbon content, and dissolved organic carbon were the main reasons for the fluctuation of the bacterial dominant species. Further investigation demonstrated that the abundance of variable microorganisms, including Acidobacteria, Proteobacteria, Bacteroidetes, Firmicutes, Chloroflexi, Gemmatimonadetes, Patescibacteria, Armatimonadetes, Subgroups_ 6, Bacillus and Bacillus_ Acidiceler, was also significantly changed in Cd-contaminated soil. All these alterations could contribute to the reduction of the Cd content and, thus, the increase of the biomass and the content of the main secondary metabolites (matrine and oxymatrine) in Sophora. Our research demonstrated that the co-application of biochar and organic fertilizer has the potential to enhance soil health and increase the productivity and quality of plants by regulating the microorganisms in Cd-contaminated soil.

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Remediation Agents Drive Bacterial Community in a Cd-Contaminated Soil

Cited by 10 publications

References 97 publications

Remediation of Cadmium and Lead in Mine Soil by Ameliorants and Its Impact on Maize (Zea mays L.) Cultivation

Remediation of Cadmium and Lead in Mine Soil by Ameliorants and Its Impact on Maize (Zea mays L.) Cultivation

Extraction of heavy metals from copper tailings by ryegrass (Lolium perenne L.) with the assistance of degradable chelating agents

Biochar and organic fertilizer drive the bacterial community to improve the productivity and quality of Sophora tonkinensis in cadmium-contaminated soil

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