Rhizosphere Effect on Physicochemical Properties and Immobilization Performance of Biochar

Wang, Jie; Liu, Jiaqiang; Zhou, Jianzhong; Chang, Luo; Shen, Zhenguo; Shi, Liang; Chen, Yahua

doi:10.1007/s11270-022-05902-4

Cited by 8 publications

(2 citation statements)

References 57 publications

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“…The liming effect of biochar amendments is the main mechanism for inhibiting heavy metal migration by LMWOAs, despite their ability to protonate the surface of biochar amendments, which can deactivate or reduce their adsorption capacity for heavy metal(loid) s (Achor et al 2020). However, the mobility and bioavailability of heavy metal(loid)s in the soil can increase again if the alkalinity of the biochar amendments is not sufficient to neutralize the acidity of the LMWOAs (Wang et al 2022a). The study by Houben and Sonnet (2015) found that 5% biochar significantly reduced exchangeable heavy metal(loid)s and facilitated the transition from the exchangeable to the carbonate bound state in Cd, Pb, and Zn contaminated soils, but the heavy metal(loid)s were remobilized due to the subsequent acidification of rootgenerated LMWOAs that neutralized the liming effect of biochar.…”

Section: Adjustment Of Soil Phmentioning

confidence: 99%

A critical review of the interactions between rhizosphere and biochar during the remediation of metal(loid) contaminated soils

Fan,

Cui,

Zhang

et al. 2023

Biochar

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Biochar has a large specific surface area, well-developed pore structure, abundant surface functional groups, and superior nutrient supply capacity, which is widely available and environmentally friendly with its advantages in waste resource utilization, heavy metal(loid) remediation, and carbon storage. This review focuses on the interactions between biochar (including raw biochar, functional biochar (modified/ engineered/ designer biochar), and composite biochar) and rhizosphere during the remediation of soil contaminated with heavy metal(loid)s (Pb, As, Cd, Hg, Co, Cu, Ni, Zn, Cr, etc.) and the effects of these interactions on the microbial communities and root exudates (enzymes and low-molecular-weight organic acids (LMWOAs)). In terms of microorganisms, biochar affects the composition, diversity, and structure of microbial communities through the supply of nutrients, provision of microbial colonization sites, immobilization of heavy metal(loid)s, and introduction of exogenous microorganisms. With regard to root exudates, biochar provides electron transfer support between the microorganisms and exudates, regulates the secretion of enzymes to resist the oxidative stress stimulated by heavy metal(loid)s, ameliorates rhizosphere acidification caused by LMWOAs, and promotes the activity of soil enzymes. The roles and mechanisms of biochar on rhizosphere soils are discussed, as well as the challenges of biochar in the remediation of heavy metal(loid)-contaminated soils, and the issues that need to be addressed in future research are foreseen. Graphical Abstract

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Section: Adjustment Of Soil Phmentioning

confidence: 99%

A critical review of the interactions between rhizosphere and biochar during the remediation of metal(loid) contaminated soils

Fan,

Cui,

Zhang

et al. 2023

Biochar

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“…Such behavior might be explained by the rhizosphere effect. According to Wang et al (2022), the rhizosphere effect of wheat accelerated the aging process of biochar, even in the short term, and increased the number of surface functional groups (C=O and O=C-OH) on the aged biochar, in turn, promoting the adsorption capacity of rice husk-and sludge-derived biochar for Cd and Pb. In our study, though, the reduced uptake of Pb was greater than Cd regardless of the biochar (Figure 4).…”

Section: Metals Uptakementioning

confidence: 99%

Biochar amendment of a metal contaminated soil partially immobilized Zn, Pb, and Cd and reduced ryegrass uptake

Antonângelo

Zhang

Sitienei

2023

Front. Environ. Sci.

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Soil heavy metals (HM) contamination threatens soil and water quality, which significantly affects humans and animals. This study focuses on the competitive immobilization of zinc (Zn), lead (Pb), and cadmium (Cd) in soils from a contaminated site using ryegrass (Lolium perenne) in a potting experiment amended with biochars. Increased rates of switchgrass- (SGB) and poultry litter-derived biochars (PLB) were applied before ryegrass cultivation. Soil HM phytoavailability and HM concentrations in plant shoots were determined. Multivariate regression models were used to evaluate the influence of several soil chemical attributes on the HM phytoavailability. The increased rates of both biochars reduced the Zn, Pb, and Cd availability (p < 0.001). Langmuir models showed that the maximum HM immobilization (IMAX) was 169.2 ± 29.5 mg kg–1 for Zn with SGB, and 20 ± 7.4 (Pb) and 1.08 mg kg–1 (Cd) with PLB. The extended Langmuir model (EL) showed competitive HM immobilization since there was a decrease in the IMAX of Zn (∼90 ± 28 mg kg–1 from SGB) and Cd (∼0.70 ± 0.21 mg kg–1). Negative values of Pb and Cd immobilization at low rates of SGB indicated an increase in those HM availabilities and preferential immobilization for Zn. The reduced Zn and Pb uptake in ryegrass shoots ranged from 70% to 98% and were optimum at rates of 0.50% ± 0.00%–0.60% ± 0.06% for both biochars, and 1.6% ± 0.4% of SGB for Cd. The stepwise multiple linear regression (SMLR) and partial least squares (PLS) revealed that pH and organic matter (OM) were the most responsible factors for reducing Zn bioavailability while OM was more impactful in decreasing Pb and Cd levels. This suggests that the preferential immobilization for Zn relies on its higher sensitivity to the pH increase. Also, the ubiquitous positive relationship among the metals studied shows that competitive immobilization is ceased at high rates of biochars application. Path analysis (PA) showed that pH and OM were the common contributors from both biochars to simultaneously affect Zn, Pb, and Cd availability regardless of the contrasting physicochemical properties of the two bioproducts. This work proved the potential of applying low rates of two contrasting feedstock-derived biochars to remediate the contaminants and safely grow ryegrass.

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Effect of Rice Straw Biochar on Rhizosphere Microbiome and Groundwater Quality During Phytoremediation of Alum Mines

Wang,

Yu,

Zhao

2024

Water Air Soil Pollut

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Rhizosphere Effect on Physicochemical Properties and Immobilization Performance of Biochar

Cited by 8 publications

References 57 publications

A critical review of the interactions between rhizosphere and biochar during the remediation of metal(loid) contaminated soils

A critical review of the interactions between rhizosphere and biochar during the remediation of metal(loid) contaminated soils

Biochar amendment of a metal contaminated soil partially immobilized Zn, Pb, and Cd and reduced ryegrass uptake

Effect of Rice Straw Biochar on Rhizosphere Microbiome and Groundwater Quality During Phytoremediation of Alum Mines

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