Biochar alleviates metal toxicity and improves microbial community functions in a soil co-contaminated with cadmium and lead

Azadi, Nahid; Raiesi, Fayez

doi:10.1007/s42773-021-00123-0

Cited by 40 publications

(9 citation statements)

References 59 publications

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“…Although the HA biochar used in our study reduced microbial activity and N availability, its high surface area, and low H:C ratio indicates it would be effective for remediating contaminated soils and improving soil health. Several studies [ 58 , 59 ] have linked enhanced soil microbial activity and crop growth to a decrease in the bioavailability of heavy metals in contaminated soils due to sorption on biochar surfaces. Other studies [ 60 , 61 ] that have documented simultaneous decrease in the bioavailability of heavy metals in contaminated soils and enhanced soil microbial activity and N availability had greater (0.6–0.9) biochar H:C ratio as compared to our study, suggesting the likely benefits of HA in contaminated soils.…”

Section: Resultsmentioning

confidence: 99%

Hemp biochar impacts on selected biological soil health indicators across different soil types and moisture cycles

et al. 2022

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Application of crop residues and biochar have been demonstrated to improve soil biological and chemical properties in agroecosystems. However, the integrated effect of organic amendments and hydrological cycles on soil health indicators are not well understood. In this study, we quantified the impact of hemp residue (HR), hemp biochar (HB), and hardwood biochar (HA) on five hydrolytic enzymes, soil microbial phospholipid (PLFA) community structure, pH, permanganate oxidizable carbon (POXC) soil organic carbon (SOC), and total nitrogen (TN). We compared two soil types, Piedmont and Coastal Plain soils of North Carolina, under (i) a 30-d moisture cycle maintained at 60% water-filled pore space (WFPS) (D-W1), followed by (ii) a 7-day alternate dry-wet cycle for 42 days (D-W2), or (iii) maintained at 60% WFPS for 42 days (D-W3) during an aerobic laboratory incubation. Results showed that HR and HB significantly increased the geometric mean enzyme activity by 1-2-fold in the Piedmont soil under the three moisture cycles and about 1.5-fold under D-W in the Coastal soil. In the presence of HA, the measured soil enzyme activities were significantly lower than control under the moisture cycles in both soil types. The shift in microbial community structure was distinct in the Coastal soil but not in the Piedmont soil. Under D-W2, HR and HB significantly increased POXC (600–700 mg POXC kg-1 soil) in the Coastal soil but not in the Piedmont soil while HA increased nitrate (8 mg kg-1) retention in the Coastal soil. The differences in amendment effect on pH SOC, TN, POXC, and nitrate were less distinct in the fine-textured Piedmont soil than the coarse-textured Coastal soil. Overall, the results indicate that, unlike HA, HR and HB will have beneficial effects on soil health and productivity, therefore potentially improving soil’s resilience to changing climate.

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Section: Resultsmentioning

confidence: 99%

Hemp biochar impacts on selected biological soil health indicators across different soil types and moisture cycles

et al. 2022

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“…In the early stage, it may be that biochar can adsorb manganese ions in the soil and reduce the toxicity of manganese ions to microorganisms. The application of exogenous organic carbon increased the content of DOC [43]; the latter may be DOC can be used as a heavy metal ion carrier, so that manganese ions combined with DOC, thereby reducing the DOC content [44]. The content of ROC in the soil of the two sugarcane elds increased with the application ratio of biochar.…”

Section: Effects Of Biochar Application On Different Soil Carbon Frac...mentioning

confidence: 99%

Effect of bagasse biochar on soil organic carbon fixation in manganese pollution sugarcane fields

Liu

et al. 2023

Preprint

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In order to study the mechanism of soil organic carbon transformation and fixation in manganese-contaminated farmland, 100-day indoor constant temperature incubation experiments were conducted to analyze the characteristics of soil physical and chemical properties, organic carbon mineralization, organic carbon components and enzyme activities by applying different proportions (0%, 0.5%, 2%, 5%) of biochar. The results showed that the cumulative CO2 emission decreased by 15.78~36.87% compared with the control when different proportions of biochar were applied in the manganese-contaminated soil. The cumulative CO2 emissions were reduced by 35.29~57.29% compared with the control when different proportions of biochar were applied to the uncontaminated sugarcane field soil. The microbial carbon content of uncontaminated sugarcane soil was 28.49 mg·kg-1(0.5%),37.92 mg·kg-1(2%) and 39.42 mg·kg-1(5%), respectively, which were higher than that of manganese contaminated sugarcane soil 12.72 mg·kg-1 (0.5%),13.71 mg·kg-1(2%) and 15.10 mg·kg-1 (5%). The catalase activities of manganese-contaminated sugarcane soil were 0.13 mg·g-1·min-1 (0.5%), 0.21 mg·g-1·min-1 (2%) and 0.27 mg·g-1·min-1 (5%), respectively, which were lower than those of uncontaminated sugarcane soil 9.41 mg·g-1·min-1 (0.5%), 10.01 mg·g-1·min-1 (2%), 10.91 mg·g-1·min-1(5%). The results showed that compared with uncontaminated sugarcane field soil, the application of biochar in manganese-contaminated sugarcane soil had little effect on microbial biomass carbon content and catalase activity. The application of exogenous biochar had an auxiliary effect on carbon sequestration in manganese-contaminated soil, and the application of 5% biochar had the best carbon sequestration effect.

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“…Soil microorganisms may be the most sensitive soil organisms to subtle changes in the soil environment. Therefore, the toxic effect of Pb in the soil can reduce soil microbial biomass (Nahid and Fayez, 2021), inhibit microbial metabolism (Xu et al, 2021) and alter microbial community composition (Jianhua et al, 2021). Kamaruzzaman et al found that Pb exposure enhanced the Pb resistance of microorganisms; for example, Bacillus and Enterobacter were found to have high tolerance to Pb stress (Kamaruzzaman et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of different concentrations of biochar amendments and Pb toxicity on rhizosphere soil characteristics and bacterial community of red clover (Trifolium pretense L.)

Meng

et al. 2023

Front. Plant Sci.

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Amending soil with biochar can reduce the toxic effects of heavy metals (HM) on plants and the soil. However, the effects of different concentrations of biochar on the properties and microbial activities in lead (Pb)-contaminated soils are unclear. In this study, two Pb concentrations were set (low, 1000 mg/kg; high, 5000 mg/kg), and five corn straw biochar (CSB) concentrations (0, 2.5, 5, 10 and 15%) were used to determine the response of the growth and rhizosphere of red clover (Trifolium pretense L.) (in terms of soil properties and bacteria) to CSB and Pb application. The results showed that 5% CSB better alleviated the toxicity of Pb on the shoot length of red clover, the biomass increased by 74.55 and 197.76% respectively and reduced the enrichment factor (BCF) and transport factor (TF) of red clover. Pb toxicity reduced soil nutrients, catalase (CAT), acid phosphatase (ACP) and urease activity, while the addition of CSB increased soil pH, soil organic matter (SOM) content and soil enzyme activity. 16S rDNA amplicon sequencing analysis showed that Pb toxicity reduced the diversity of rhizosphere bacteria in red clover and reduced the relative abundance of plant growth-promoting rhizobacteria such as Gemmatimonas, Devosia and Bryobacter. Spearman correlation analysis showed that the addition of alkaline CSB restored the relative abundance of rhizobacteria positively correlated with pH, such as Chitinophaga, Sphingomonas, Devosia and Pseudomonas, and thus restored the rhizosphere soil environment. This study demonstrates that 5% CSB can better alleviate the toxicity of Pb to red clover and soil. We also provide a theoretical basis for the subsequent use of beneficial bacteria to regulate the repair efficiency of red clover.

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Biochar alleviates metal toxicity and improves microbial community functions in a soil co-contaminated with cadmium and lead

Cited by 40 publications

References 59 publications

Hemp biochar impacts on selected biological soil health indicators across different soil types and moisture cycles

Hemp biochar impacts on selected biological soil health indicators across different soil types and moisture cycles

Effect of bagasse biochar on soil organic carbon fixation in manganese pollution sugarcane fields

Effects of different concentrations of biochar amendments and Pb toxicity on rhizosphere soil characteristics and bacterial community of red clover (Trifolium pretense L.)

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