Transformation of Lead Solid Fraction in the Rhizosphere of Elsholtzia splendens: The Importance of Organic Matter

Yang, Jianjun; Hu, Shaoping; Chen, Xincai; Yu, Mingzhou; Jin, Lei; Li, Hang; Shen, Chaofeng; Shi, Jiyan; Chen, Yingxu

doi:10.1007/s11270-009-0077-x

Cited by 16 publications

(4 citation statements)

References 47 publications

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“…Among other pollutants, Pb speciation in different soils was studied by several authors through SSE procedures (Jensen et al, 2006;Ndzangou et al, 2006;Kaplan and Yaman, 2009;Yang et al, 2010;Malandrino et al, 2011). Most studies focused on the origin of the Pb source and its properties, but not on the influence of climate conditions on soils at the time of pollution.…”

Section: Introductionmentioning

confidence: 99%

Time evolution of Pb(II) speciation in Pampa soil fractions

Ferreyroa

Montenegro

Tudino

et al. 2014

Chemical Speciation & Bioavailability

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Soil pollution by heavy metals, particularly lead, is an important environmental concern; the bioavailability of such pollutants is strongly dependent on their chemical form. Here, the speciation of Pb(II) in soil fractions as a function of time shortly after its incorporation is studied, using a selective sequential extraction method. The sample came from an Argentinean Pampas region and was extensively characterised, including Rietveld analysis of the silt+clay fraction XRD pattern to find the major mineral components. Experiments were run twice, once in the winter and once in the summer. The results show different speciation time profiles in both cases, showing faster changes in winter due to the higher water content. The summer experiment corresponds to an earlier stage in the speciation profile evolution compared with winter. The soluble/ exchangeable fraction decreases with time in summer but shows a lower and constant value in the winter. A high proportion is found to be adsorbed onto the stable (aluminosilicates+quartz) mineral fraction. The results strongly suggest that, even at a short time following soil pollution with Pb, a high proportion is adsorbed onto the mineral fraction, with only a low fraction being bioavailable. The most stable (mineral incorporated) form is observed to increase with time. Soil water content appears to be more important than temperature in determining the differences between the two.

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Section: Introductionmentioning

confidence: 99%

Time evolution of Pb(II) speciation in Pampa soil fractions

Ferreyroa

Montenegro

Tudino

et al. 2014

Chemical Speciation & Bioavailability

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“…Lead fractionation in the rhizosphere has been studied for several plant species: for Elsholtzia splendens, a potential increase of bioavailable Pb in the long-term was reported (Yang et al 2010). Similar results were found in the rhizosphere of wheat irrigated with water having high Pb concentration (Khan et al 2006).…”

Section: Introductionmentioning

confidence: 65%

Brassica napus Growth in Lead-Polluted Soil: Bioaccumulation in Plant Organs at Different Ontogenetic Stages and Lead Fractionation in Soil

Ferreyroa

Gelma

Sosa

et al. 2018

Water Air Soil Pollut

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Lead is known to be a highly toxic metal; it is often found in soils with the potential to be incorporated by plants. Here, the bioaccumulation of lead by rapeseed (Brassica napus) from a soil with Pb(II) added just before sowing is studied. The effect on plant organs is also studied at the ontogenetic stages of flowering and physiological maturity. Moreover, the chemical fractionation of Pb in the rhizosphere and bulk soil portions is investigated and related to Pb accumulation in plant organs. B. napus are found to accumulate Pb in its organs: 1.5-19.6 mg kg −1 in roots, 3.3-15.6 mg kg −1 in stems, 0.5-8.6 mg kg −1 in leaves in all treatments, and in grains 1.45 mg kg −1 at physiological maturity and only for the highest Pb dose (200 mg kg −1 ). Plant biomass reduction was observed to be about 20% at the flowering stage and only for the highest Pb dose. The analysis of metal fractionation in soil shows Pb migration from the bulk soil to the rhizosphere, attributed to concentration gradients created by root intake. Along the time period studied, lead chemical fractionation in soil evolved toward the most stable fractions, which coupled to plant uptake depleted the soluble/ exchangeable one (assumed bioavailable).

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“…The residual plants with roots were manually removed from the soil, and then shaken gently to remove loosely adhering soil from the roots. The rhizosphere soil was collected by vigorously shaking and gently brushing the root system ( Yang et al, 2010 ). Soil from an unplanted treatment was also sampled as the bulk soil (BS).…”

Section: Methodsmentioning

confidence: 99%

Maize-soybean intercropping facilitates chemical and microbial transformations of phosphorus fractions in a calcareous soil

Liu

Han

et al. 2022

Front. Microbiol.

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Intercropping often substantially increases phosphorus (P) availability to plants compared with monocropping, which could be an effective strategy for soil legacy P recovery and agricultural production. However, the biogeochemical interactions among plants, microbes, and soil that mobilize P remain largely unknown in intercropping systems. Pot experiments with maize-soybean intercropping in a calcareous soil were conducted to investigate the potential chemical and biological transformation mechanisms of inorganic P (Pi) and organic P (Po) using sequential extraction and Illumina MiSeq sequencing. Compared to monocropping of each crop, maize-soybean intercropping significantly enhanced total P uptake of the two crops by mobilizing Ca2-Pi [extracted by bicarbonate (NaHCO3)], Al-Pi/Po [extracted by ammonium fluoride (NH4F)] and Fe-Pi [extracted by sodium hydroxide and sodium carbonate (NaOH-Na2CO3)] fractions. Furthermore, there were significant increases in the organic carbon content and alkaline phosphomonoesterase (ALP) and phosphodiesterase (PDE) activities as well as the abundances of Microvirga, Lysobacter, Microlunatus and Sphingomonas under maize-soybean intercropping relative to monocropping. In contrast, compared to monocroppping, no significant change in the soil pH was observed under maize-soybean intercropping. Therefore, the enhanced P uptake of the maize-soybean intercropping probably resulted from a synergistic effect of rhizosphere organic carbon deposit, increased activities of ALP and PDE, together with the bacteria (Microvirga, Lysobacter, Microlunatus and Sphingomonas) which showed correlation with soil P forms, while the generally recognized rhizosphere acidification was excluded in this investigated calcareous soil. Moreover, the selected bacterial genera exhibited a closer network in the rhizosphere of soybean compared to maize, suggesting enhanced interactions among bacteria in the soybean rhizosphere. These results provide theoretical bases for the recovery of soil legacy P by maize-soybean intercropping.

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Transformation of Lead Solid Fraction in the Rhizosphere of Elsholtzia splendens: The Importance of Organic Matter

Cited by 16 publications

References 47 publications

Time evolution of Pb(II) speciation in Pampa soil fractions

Time evolution of Pb(II) speciation in Pampa soil fractions

Brassica napus Growth in Lead-Polluted Soil: Bioaccumulation in Plant Organs at Different Ontogenetic Stages and Lead Fractionation in Soil

Maize-soybean intercropping facilitates chemical and microbial transformations of phosphorus fractions in a calcareous soil

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