Distribution and phytoavailability of heavy metal chemical fractions in artificial soil on rock cut slopes alongside railways

Chen, Zhaoqiong; Ai, Yingwei; Chen, Fang; Wang, Kexiu; Li, Wei; Shui, Lingling; Li, Chunlin; Xiao, Jingyao; Huang, Zhiyu

doi:10.1016/j.jhazmat.2014.03.042

Cited by 52 publications

(22 citation statements)

References 55 publications

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“…b The loadings of the individual PLFA for PC1 and PC2 rate of Cd uptake by S. alfredii was higher than the activating rate of Cd from rhizospheric soil. The reducible fraction (Mn/ Fe oxide bound) is reported to be not easily available for plant uptake Chen et al 2014). However, in this study, the reducible fraction of Cd was significantly reduced after phytoextraction.…”

Section: Effects Of S Alfredii Growth On Soil Chemical Characteristicscontrasting

confidence: 58%

Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

Yang

Zhang

Lin

et al. 2017

Environ Sci Pollut Res

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The recovery of microbial community and activities is crucial to the remediation of contaminated soils. Distance-dependent variations of microbial community composition and metabolic characteristics in the rhizospheric soil of hyperaccumulator during phytoextraction are poorly understood. A 12-month phytoextraction experiment with Sedum alfredii in a Cd-contaminated soil was conducted. A pre-stratified rhizobox was used for separating sub-layer rhizospheric (0-2, 2-4, 4-6, 6-8, 8-10 mm from the root mat)/bulk soils. Soil microbial structure and function were analyzed by phospholipid fatty acid (PLFA) and MicroResp™ methods. The concentrations of total and specified PLFA biomarkers and the utilization rates for the 14 substrates (organic carbon) in the 0-2-mm sub-layer rhizospheric soil were significantly increased, as well as decreased with the increase in the distance from the root mat. Microbial structure measured by the ratios of different groups of PLFAs such as fungal/bacterial, monounsaturated/saturated, ratios of Gram-positive to Gram-negative (GP/GN) bacterial, and cyclopropyl/monoenoic precursors and 19:0 cyclo/18:1ω7c were significantly changed in the 0-2-mm soil. The PLFA contents and substrate utilization rates were negatively correlated with pH and total, acid-soluble, and reducible fractions of Cd, while positively correlated with labile carbon. The dynamics of microbial community were likely due to root exudates and Cd uptake by S. alfredii. This study revealed the stimulations and gradient changes of rhizosphere microbial community through phytoextraction, as reduced Cd concentration, pH, and increased labile carbons are due to the microbial community responses.

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Section: Effects Of S Alfredii Growth On Soil Chemical Characteristicscontrasting

confidence: 58%

Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

Yang

Zhang

Lin

et al. 2017

Environ Sci Pollut Res

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“…Some Pb might also be organically bound and retained in the soil by the addition of biochar and compost, due to organic matter2629. This implicated that the addition of biochar and Act12 favored the phytoremediation of Pb and retained it at a safe limit in soil27.…”

Section: Resultsmentioning

confidence: 99%

“…Another explanation could possibly be microbial (Act12) and biochar-assisted immobilization or stabilization of Cd, and higher dose applications facilitated the uptake31. The addition of biochar increased the soil pH and TOC, which influenced the distribution and transformation of PTEs in soil729. The extractable Pb content is higher than that of Cd, but Cd uptake in sorghum shoots is greater than that of Pb.…”

Section: Resultsmentioning

confidence: 99%

Streptomyces pactum assisted phytoremediation in Zn/Pb smelter contaminated soil of Feng County and its impact on enzymatic activities

Ali

Guo

Mahar

et al. 2017

Sci Rep

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Anthropogenic activities, such as industrial expansion, smelting, mining and agricultural practices, have intensified the discharge of potentially toxic trace elements (PTEs) into the environment, threatening human health and other organisms. To assist phytoremediation by sorghum in soil contaminated by smelters/mines in Feng County (FC), a pot experiment was performed to examine the phytoremediation potential of Streptomyces pactum (Act12) + biochar. The results showed that root uptake of Zn and Cd was reduced by 45 and 22%, respectively, while the uptake of Pb and Cu increased by 17 and 47%, respectively. The shoot and root dry weight and chlorophyll content improved after Act12 inoculation. β-glucosidase, alkaline phosphatase and urease activities in soil improved and antioxidant activities (POD, PAL, PPO) decreased after application of Act12 + biochar due to a reduction in stress from PTEs. BCF, TF and MEA confirmed the role of Act12 in the amelioration and translocation of PTEs. PCA analysis showed a correlation between different factors that affect the translocation of PTEs. Overall, Act12 promoted the phytoremediation of PTEs. Field experiments on Act12 + biochar may provide new insights into the rehabilitation and restoration of soils contaminated by mines.

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“…Rascio and Navari-Izzo reported that two types of higher plants can tolerate high heavy metal concentrations in the soil [43], accumulator plants and excluder plants. To determine if a plant is a metal accumulator or an excluder, the BCF and TF must be considered [44,45]. Excluder plants can inhibit metal entrance into the plant or restrict root-to-shoot translocation (featuring TF < 1).…”

Section: Accumulation and Correlation Of Heavy Metal Concenmentioning

confidence: 99%

Heavy Metal Residues in Soil and Accumulation in Maize at Long-Term Wastewater Irrigation Area in Tongliao, China

Yao

Shan

et al. 2015

Journal of Chemistry

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Soil and plant samples were collected from Tongliao, China, during the maize growth cycle between May and October 2010. Heavy metals, such as Cr, Pb, Ni, and Zn, were analyzed. The concentrations of Cr, Pb, Ni, and Zn in the wastewater-irrigated area were higher than those in the topsoil from the groundwater-irrigated area. The concentrations of metals in the maize increased as follows: Pb < Ni < Zn < Cr. In addition, Cr, Pb, and Ni mainly accumulated in the maize roots, and Zn mainly accumulated in the maize fruit. The results of translocation factors (TF) and bioconcentration factors (BCF) of maize for heavy metals revealed that maize is an excluder plant and a potential accumulator plant and can serve as an ideal slope remediation plant. In addition, the increasing heavy metal contents in soils that have been polluted by wastewater irrigation must result in the accumulation of Cr, Pb, Ni, and Zn in maize. Thus, the pollution level can be decreased by harvesting and disposing of and recovering the plant material.

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Distribution and phytoavailability of heavy metal chemical fractions in artificial soil on rock cut slopes alongside railways

Cited by 52 publications

References 55 publications

Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

Streptomyces pactum assisted phytoremediation in Zn/Pb smelter contaminated soil of Feng County and its impact on enzymatic activities

Heavy Metal Residues in Soil and Accumulation in Maize at Long-Term Wastewater Irrigation Area in Tongliao, China

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