Biochar’s stability and effect on the content, composition and turnover of soil organic carbon

Han, Lanfang; Sun, Ke; Yang, Yan; Xia, Xinghui; Li, Fangbai; Yang, Zhifeng; Xing, Baoshan

doi:10.1016/j.geoderma.2020.114184

Cited by 180 publications

(82 citation statements)

References 236 publications

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“…In contrast, incorporation of biochar into soils has been recognized as a promising strategy to increase C sequestration, mitigate greenhouse gas emissions, and promote soil health (Han et al., 2020; Lehmann, 2007; Smith, 2016; Xu et al., 2019). Biochar is pyrolyzed from organic materials under oxygen‐limited conditions, and often contains a relatively larger proportion of condensed aromatic C that can persist in soils for hundreds to thousands of years (Lehmann et al., 2011).…”

Section: Introductionmentioning

confidence: 99%

Greater microbial carbon use efficiency and carbon sequestration in soils: Amendment of biochar versus crop straws

Liu

et al. 2020

GCB Bioenergy

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Section: Introductionmentioning

confidence: 99%

Greater microbial carbon use efficiency and carbon sequestration in soils: Amendment of biochar versus crop straws

Liu

et al. 2020

GCB Bioenergy

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“…As shown in Figure 6 , biochar could provide nutrient elements to microorganisms except for enhancing microbial aggregation on the surface area. The stable organic carbon fraction of biochar would directly increase the OC and alter the organic components in soil through physical mixing ( Han et al, 2020 ), and porous structures of biochar can decrease soil density ( Guo et al, 2020 ). The environment suitable for the growth of microbes was established.…”

Section: Resultsmentioning

confidence: 99%

Remediation of Chromium-Contaminated Soil Based on Bacillus cereus WHX-1 Immobilized on Biochar: Cr(VI) Transformation and Functional Microbial Enrichment

Chen

Sun

et al. 2021

Front. Microbiol.

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Microorganisms are applied to remediate chromium (Cr)-contaminated soil extensively. Nevertheless, the microbial loss and growth inhibition in the soil environment restrain the application of this technology. In this study, a Cr(VI)-reducing strain named Bacillus cereus WHX-1 was screened, and the microbial aggregates system was established via immobilizing the strain on Enteromorpha prolifera biochar to enhance the Cr(VI)-reducing activity of this strain. The mechanism of the system on Cr(VI) transformation in Cr-contaminated soil was illuminated. Pot experiments indicated that the microbial aggregates system improved the physicochemical characteristics of Cr-contaminated soil obviously by increasing organic carbon content and cation exchange capacity, as well as decreasing redox potential and bulk density of soil. Moreover, 94.22% of Cr(VI) was transformed into Cr(III) in the pot, and the content of residue fraction Cr increased by 63.38% compared with control check (CK). Correspondingly, the physiological property of Ryegrass planted on the Cr-contaminated soil was improved markedly and the main Cr(VI)-reducing microbes, Bacillus spp., were enriched in the soil with a relative abundance of 28.43% in the microbial aggregates system. Considering more active sites of biochar for microbial aggregation, it was inferred that B. cereus WHX-1 could be immobilized by E. prolifera biochar, and more Cr(VI) was transformed into residue fraction. Cr stress was decreased and the growth of plants was enhanced. This study would provide a new perspective for Cr-contaminated soil remediation.

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“…Compared to the CK, BR addition had no significant effect on the DOC content ( p > 0.05), while BC300 and BC600 reduced the DOC content from 543.3 mg C/kg to 488.9 mg C/kg and 413.2 mg C/kg, respectively (Figure S2). Relative to BC300, BC600 produced a stronger reduction ( p < 0.05), which might be partly related to the fact that BC600 had a particularly high SSA (131.4 m 2 /g) so that DOC fraction could be prevented through pore‐filling mechanism from leaching or being used by organisms (Han et al, 2020; Pignatello et al, 2006). In addition to the DOC concentration, the analysis of ESI‐FT‐ICR‐MS demonstrated the change in the molecular structure of DOC.…”

Section: Resultsmentioning

confidence: 99%

“…By setting BR as the feedstock, it could be speculated that the change direction and intensity of SOC structure induced by biochar amendment as well as the dominant underlying mechanism would vary with the pyrolysis temperature of biochar. As reviewed in our previous study (Han et al, 2020), native SOC was different from the OC extracted from biochar, especially the high temperature biochar; the OC of high temperature biochar had lower atomic H/C ratio and more abundant aromatic C than native SOC. In addition, high temperature biochar generally had higher porosity than the low temperature one, and thus would retain more native SOC (Zhang et al, 2019).…”

Section: Introductionmentioning

confidence: 84%

“…Besides the microbial driver, two other processes would also contribute to the structural alternation of SOC after biochar application. First, the “contamination” of native SOC with biochar‐derived OC, which generally provides a higher amount of recalcitrant carbon and lower labile carbon than native SOC (Han et al, 2020). Second, the porous structure of biochar would help to retain some SOC fractions through pore‐filling, thereby protecting these fractions being mineralized or lost (Pignatello et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Biogas residue biochar shifted bacterial community, mineralization, and molecular structure of organic carbon in a sandy loam Alfisol

et al. 2021

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Pyrolysis into biochar as a soil amendment has been treated as an eco‐friendly and environmentally sustainable method to recycle biogas residue (BR). However, the effect of BR biochar on soil bacterial community, mineralization, and structure of organic carbon (OC) remains unrevealed, which limits the soil application of BR biochar. This study performed a microcosm incubation experiment for a sandy soil with BR and BR‐derived biochar produced at relatively low (300°C) and high (600°C) temperature (BC300 and BC600), and explored the shift in bacterial community, mineralization, and structure of OC. Results showed that BR decreased the richness and diversity of bacterial community by 19.0%–28.0%, while BR biochar caused lower reduction (4.0%–7.0%), suggesting the potential of pyrolysis in mitigating the harmful effect of BR in bacterial community. Fourier‐transform ion cyclotron resonance mass spectrometry and 13C nuclear magnetic resonance demonstrated that BR and BR biochar shifted dissolved OC toward components with 12.0%–26.0% higher molecular weight and 18.0%–21.0% more aromatics but 10.0%–22.0% lower polarity and less protein‐, carbohydrate‐, and tannin‐like species, with the shift extent being stronger for BC600. Furthermore, BC600 increased the aromaticity of bulk OC but reduced the carbohydrate, possibly due to more Actinobacteria genera. Additionally, BR significantly elevated the amount and rate of soil carbon mineralization, while the potentially mineralizable C was the lowest in the BC600‐treated soil. These findings suggested that the pyrolysis into biochar at high temperature would be a promising way to treat BR in terms of soil bacterial community richness/diversity and carbon sequestration.

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Biochar’s stability and effect on the content, composition and turnover of soil organic carbon

Cited by 180 publications

References 236 publications

Greater microbial carbon use efficiency and carbon sequestration in soils: Amendment of biochar versus crop straws

Greater microbial carbon use efficiency and carbon sequestration in soils: Amendment of biochar versus crop straws

Remediation of Chromium-Contaminated Soil Based on Bacillus cereus WHX-1 Immobilized on Biochar: Cr(VI) Transformation and Functional Microbial Enrichment

Biogas residue biochar shifted bacterial community, mineralization, and molecular structure of organic carbon in a sandy loam Alfisol

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