Mitigation effects of silicon rich amendments on heavy metal accumulation in rice (Oryza sativa L.) planted on multi-metal contaminated acidic soil

Gu, Huazhi; Qiu, Hao; Tian, Tian; Zhan, Shu-Shun; Deng, Tenghaobo; Chaney, Rufus L.; Wang, Shizhong; Tang, Yetao; Morel, Jean-Louis

doi:10.1016/j.chemosphere.2011.03.014

Cited by 287 publications

(111 citation statements)

References 44 publications

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“…Finally, there are also other studies showing that metal mobility is reduced in the presence of biochar due to adsorption on the biochar surface (especially on carboxylic and phenolic groups; Uchimiya et al 2011a, b). On the other hand, a probable increase in the silicon (Si) concentration of soil solution after biochar addition may also contribute to metal immobilization via the formation of silicate precipitates (Houben et al 2014;Zheng et al 2012;Gu et al 2011). A significant increase in Si concentration of soil pore water after biochar (made from rice straw) addition was obtained in our recent study ).…”

Section: Discussionmentioning

confidence: 49%

Mitigating heavy metal accumulation into rice (Oryza sativa L.) using biochar amendment — a field experiment in Hunan, China

Zheng

Chen

Cai

et al. 2015

Environ Sci Pollut Res

138

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A field experiment was conducted to investigate the effect of bean stalk (BBC) and rice straw (RBC) biochars on the bioavailability of metal(loid)s in soil and their accumulation into rice plants. Phytoavailability of Cd was most dramatically influenced by biochars addition. Both biochars significantly decreased Cd concentrations in iron plaque (35-81 %), roots (30-75 %), shoots (43-79 %) and rice grain (26-71 %). Following biochars addition, Zinc concentrations in roots and shoots decreased by 25.0-44.1 and 19.9-44.2 %, respectively, although no significant decreases were observed in iron plaque and rice grain. Only RBC significantly reduced Pb concentrations in iron plaque (65.0 %) and roots (40.7 %). However, neither biochar significantly changed Pb concentrations in rice shoots and grain. Arsenic phytoavailability was not significantly altered by biochars addition. Calculation of hazard quotients (HQ) associated with rice consumption revealed RBC to represent a promising candidate to mitigate hazards associated with metal(loid) bioaccumulation. RBC reduced Cd HQ from a 5.5 to 1.6. A dynamic factor's way was also used to evaluate the changes in metal(loid) plant uptake process after the soil amendment with two types of biochar. In conclusion, these results highlight the potential for biochar to mitigate the phytoaccumulation of metal(loid)s and to thereby reduce metal(loid) exposure associated with rice consumption.

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Section: Discussionmentioning

confidence: 49%

Mitigating heavy metal accumulation into rice (Oryza sativa L.) using biochar amendment — a field experiment in Hunan, China

Zheng

Chen

Cai

et al. 2015

Environ Sci Pollut Res

138

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“…in solution calculated by the Visual MINTEQ program to be the same for all the Si treatments. In such conditions, a different Zn distribution pattern was observed in Si-treated plants with a higher metal concentration in roots either in hydroponic or in soil experiments (Gu et al 2011(Gu et al , 2012Song et al 2011). Several explanations were given: (a) Si addition contributes to the root cell wall strengthen delaying the Zn 2?…”

Section: Zinc Deficiencymentioning

confidence: 99%

“…There are several evidences that Zn distribution in plant changed by the Si addition in hydroponic and soil experiments (Gu et al 2011(Gu et al , 2012Bityutskii et al 2014) and that both elements presented a similar location in plants (Gu et al 2012). Gu et al (2012) overcome the Si effect due to the metal precipitation in the growth media and try to elucidate the internal role of Si under Zn toxicity conditions by maintaining a similar activity of free Zn 2?…”

Section: Zinc Deficiencymentioning

confidence: 99%

Can silicon partially alleviate micronutrient deficiency in plants? a review

Hernández‐Apaolaza

2014

Planta

138

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Silicon protects plants against various biotic and abiotic stresses, including metal toxicity. Under a high metal concentration, Si can externally decrease metal availability to the plant by its precipitation in the growth media, and Si also affects the metal distribution inside the plant, diminishing the damage. Could Si also protect plants against metal deficiency stress? Recently, the physiological role of Si in relation to micronutrients deficiency symptoms has been assessed in several plant species in hydroponics. In cucumber, Si supply mitigated the symptoms of Fe deficiency, but this effect was not clear under Zn-or Mndeficiency conditions. The main factor controlling this beneficial effect seems to be the Si contribution to the formation of metal deposits in the root and/or leaves apoplast and its role in their following remobilization when required. The enhancement of the content of long-distance transport molecules (such as citrate) due to Si addition should also contribute to the metal transport from root to shoot, which will diminish deficiency symptoms.

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“…This is also shown by the present study with increasing amounts of amendments, especially with bone char, followed by sepiolite. An increasing amount of amendment (and consequently rise in soil pH) reduced the bioavailability of Cd Gu et al, 2011;Liang et al, 2014;Zhen et al, 2015). Of the four exchangeable ''fractions,'' the percentages of FI and FIII decreased, whereas FII and FIV increased upon amendment.…”

Section: Discussionmentioning

confidence: 99%

Effect of Mineral-Based Amendments on Rice (Oryza sativa L.) Growth and Cadmium Content in Plant and Polluted Soil

Leiming¹,

Pengliang²,

TieBaiqing³

et al. 2017

Environmental Engineering Science

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Agricultural soils can be contaminated by industrial activities such as mining and smelting. Contamination with cadmium (Cd) can significantly exceed average background values, which can lead to uptake by rice plant and even harm to humans through food chain. In Hunan province, southern China, rice (Oryza sativa L.) is the main cereal, and human exposure to metallic contaminants through rice pathway is of particular interest. Shortage of land for rice growing means that contaminated agricultural soil is still cultivated for rice in Hunan. In the present work, a field experiment was undertaken to remediate Cd-contaminated paddy soil with three mineral amendments, namely sepiolite, bone char, and a silicon-based product (normally used as fertilizer). Average Cd concentration in the paddy soil was 2.85 mg/kg, significantly exceeding Chinese soil quality standards of China. Cd content was 0.59 mg/kg in sepiolite, 0.28 mg/kg in bone char, and 0.44 mg/kg in silicon fertilizer, respectively. Distribution fractions of Cd in soil followed the order of exchangeable (FI) > organic matter-bound (FIII) > residual (FIV) > oxide-bound (FII) without treatment, while exchangeable (FI) > residual (FIV) > organic matter-bound (FIII) > oxide-bound (FII) after treatment. With addition of three amendments, soil pH values and rice growth such as plant height and ripening rate increased. Concentrations of Cd in the rice plant (straw, husk, and unpolished rice) decreased after treatment. However, among three amendments, only the bone char addition reduced Cd accumulation in the rice plant below the Chinese standard value (0.2 mg/kg) and in the husk to below the Chinese feed hygiene standard for food (0.5 mg/kg).

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Mitigation effects of silicon rich amendments on heavy metal accumulation in rice (Oryza sativa L.) planted on multi-metal contaminated acidic soil

Cited by 287 publications

References 44 publications

Mitigating heavy metal accumulation into rice (Oryza sativa L.) using biochar amendment — a field experiment in Hunan, China

Mitigating heavy metal accumulation into rice (Oryza sativa L.) using biochar amendment — a field experiment in Hunan, China

Can silicon partially alleviate micronutrient deficiency in plants? a review

Effect of Mineral-Based Amendments on Rice (Oryza sativa L.) Growth and Cadmium Content in Plant and Polluted Soil

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