Mobilization of cadmium by dissolved organic matter in the rhizosphere of hyperaccumulator Sedum alfredii

Li, Tingqiang; Liang, Chengfeng; Han, Xuan; Yang, Xiaoe

doi:10.1016/j.chemosphere.2013.01.100

Cited by 56 publications

(14 citation statements)

References 48 publications

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“…Initial Cd 2+ is very low because Cd easily sorbs onto the soil matrix and forms complexes in solution, particularly with the soluble organic matter. In our results, the dissolved organic carbon (DOC) concentration was between 1.1× 10 −2 and 234 mg L −1 , and the 3st quarter value was 21.9 mg L −1 (Table S2); this range was a little lower than reported ranges (21-528 mg L −1 ) in the literature (Li et al 2013;Yin et al 2002). The free ion fraction (F M0 ) ranged between 8.4×10 −5 and 1.0 with a median value 0.12 and was comparable with 0 to 0.6 (median value 0.2) in Sauvé et al (2000b) and c.a.…”

Section: Discussioncontrasting

confidence: 62%

Ranking of mechanisms governing the phytoavailability of cadmium in agricultural soils using a mechanistic model

et al. 2015

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Aims The objective of this study was to rank the mechanisms influencing the phytoavailability of cadmium(Cd) in agricultural soils.Methods We developed a model that simulates the transport by diffusion and convection, the kinetics ofsorption and complexation in solution and the root uptake of Cd. The ranking of mechanisms was performed by simulating the Cd2+ uptake by 1 cm2 root for 30 days for French agricultural soil characteristics.Results The initial Cd2+ concentration was the most influential parameter followed by the soil buffer power for Cd2+ and by the soil water content and impedance factor. The Cd2+ was generally strongly depleted at theroot surface and the convection was almost negligible. In general, the Cd complex dissociation contributedlittle to the uptake due to a strong kinetics limitation. Conversely, the kinetics of sorption was little influential.Conclusions The initial concentration and diffusion of Cd2+ were the dominant processes governing the phytoavailability in non-polluted soils. A model considering only the transport and sorption of Cd2+ without kineticswould be adequate to predict the phytoavailability. The particular situations where these simplifications do nothold (relative error >10 %) corresponded to a high supply of labile Cd complex toward plant roots

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Section: Discussioncontrasting

confidence: 62%

Ranking of mechanisms governing the phytoavailability of cadmium in agricultural soils using a mechanistic model

et al. 2015

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“…Enhanced metal uptake by these species does not seem to be related to specific phenomena, but to the enhancement of processes common with non-accumulators. They include a highly developed root system, enhanced transport activity at the soil-root interface, and possibly enhanced release (or release of different types) of organic ligands (Wenzel et al, 2003;Li et al, 2013;Tsednee et al, 2014). Arabidopsis halleri is a model of Zn, Cd hyperaccumulating plant, and it has been intensively studied for the genetics and physiology of metal tolerance and hyperaccumulation (Roosens et al, 2008;Sarret et al, 2009;Huguet et al, 2012;Verbruggen et al, 2013;Isaure et al, 2015;Meyer et al, 2015).…”

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confidence: 99%

Fate of cadmium in the rhizosphere of Arabidopsis halleri grown in a contaminated dredged sediment

Huguet

Isaure

Bert

et al. 2015

Science of The Total Environment

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In regions impacted by mining and smelting activities, dredged sediments are often contaminated with metals. Phytotechnologies could be used for their management, but more knowledge on the speciation of metals in the sediment and on their fate after colonization by plant roots is needed. This work was focused on a dredged sediment from the Scarpe river (North of France), contaminated with Zn and Cd. Zn, Cd hyperaccumulating plants Arabidopsis halleri from metallicolous and non-metallicolous origin were grown on the sediment for five months in a pot experiment. The nature and extent of the modifications in Cd speciation with or without plant were determined by electron microscopy, micro X-ray fluorescence and bulk and micro X-ray absorption spectroscopy. In addition, changes in Cd exchangeable and bioavailable pools were evaluated, and Cd content in leachates was measured. Finally, Cd plant uptake and plant growth parameters were monitored. In the original sediment, Cd was present as a mixed Zn, Cd, Fe sulfide. After five months, although pots still contained reduced sulfur, Cd-bearing sulfides were totally oxidized in vegetated pots, whereas a minor fraction (8%) was still present in non-vegetated ones. Secondary species included Cd bound to O-containing groups of organic matter and Cd phosphates. Cd exchangeability and bioavailability were relatively low and did not increase during changes in Cd speciation, suggesting that Cd released by sulfide oxidation was readily taken up with strong interactions with organic matter and phosphate ligands. Thus, the composition of the sediment, the oxic conditions and the rhizospheric activity (regardless of the plant origin) created favorable conditions for Cd stabilization. However, it should be kept in mind that returning to anoxic conditions may change Cd speciation, so the species formed cannot be considered as stable on the long term.

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“…It has been reported that high Cd–DOM complexes in the rhizosphere soil solution improve Cd accumulation in plants (Li et al . 2013). This can explain why most average Cd levels in late rice were always greater than those in early rice (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Organic matter can exist in soluble complexes with Cd to reduce metal adsorption onto soil particles and promote metal availability for plants (Antoniadis & Alloway 2002;Cornu et al 2011). It has been reported that high Cd-DOM complexes in the rhizosphere soil solution improve Cd accumulation in plants (Li et al 2013). This can explain why most average Cd levels in late rice were always greater than those in early rice (Fig.…”

Section: Ph and Doc In Soilmentioning

confidence: 97%

Long-term effects of biochar on rice production and stabilisation of cadmium and arsenic levels in contaminated paddy soils

Chen

Wang²,

Zheng

et al. 2018

Earth and Environmental Science Transactions of the Royal Socie

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Heavy metal contamination in the paddy soils of China is a serious concern because of its health risk through transfer in food chains. A field experiment was conducted in 2014–2015 to investigate the long-term effects of different biochar amendments on cadmium (Cd) and arsenic (As) immobilisation in a contaminated paddy field in southern China. Two types of biochar, a rice-straw-derived biochar (RB) and a coconut-by-product-derived biochar (CB), were amended separately to determine their impacts on rice yield and their efficacy in reducing Cd and As in rice. The two-year field experiment showed that biochar amendments significantly improved the rice yields and that CB is superior to RB, especially in the first growth season. Using a large amount of biochar amendment (22.5tha–1) significantly increased soil pH and total organic carbon, and concomitantly decreased the Cd content in rice grains over the four growth seasons, regardless of biochar type and application rate. Arsenic levels in rice were similar to the control, and results from this study suggest that there was a sustainable effect of biochar on Cd sequestration in soil and reduction of Cd accumulation in rice for at least two years. Biochar amendment in soil could be considered as a sustainable, reliable and cost-effective option to remediate heavy metal contamination in paddy fields for long periods.

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Mobilization of cadmium by dissolved organic matter in the rhizosphere of hyperaccumulator Sedum alfredii

Cited by 56 publications

References 48 publications

Ranking of mechanisms governing the phytoavailability of cadmium in agricultural soils using a mechanistic model

Ranking of mechanisms governing the phytoavailability of cadmium in agricultural soils using a mechanistic model

Fate of cadmium in the rhizosphere of Arabidopsis halleri grown in a contaminated dredged sediment

Long-term effects of biochar on rice production and stabilisation of cadmium and arsenic levels in contaminated paddy soils

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