Biochar and nitrate reduce risk of methylmercury in soils under straw amendment
Abstract
There is growing evidence that incorporating crop straw into soils, which is being widely encouraged in many parts of the world, could increase net methylmercury (MeHg) production in soils and MeHg accumulation in crops. We explored the possibility of mitigating the risk of increased MeHg levels under straw amendment by transforming straw into biochar (BC). Greenhouse and batch experiments were conducted, in which soil MeHg concentrations, MeHg phytoavailability and accumulation in rice, dynamics of sulfate, nitrate and abundances of sulfate reducing bacteria (SRB) were compared in 'Control' (Hg contaminated soil), 'Straw' (soil with 1% rice straw), 'Straw+BC' (soil with 1% straw and 1% biochar), and 'Straw+BC+N' (soil with 1% straw, 1% biochar and 0.12% nitrate). Our results indicate that straw amendment increased MeHg concentrations in soils (28-136% higher) and rice plants (26% higher in grains, 'Straw' versus 'Control'), while co-application of biochar with straw reduced grain MeHg levels (60% lower, 'Straw+BC' versus 'Straw'). This could be mainly attributed to the reduced MeHg availability to rice plants (phytoavailability, extraction rates of MeHg by ammonium thiosulfate) under biochar amendment (64-99% lower, 'Straw+BC' versus 'Straw'). However, biochar amendment enhanced soil MeHg levels (5-75% higher, 'Straw+BC' versus 'Control'). Interestingly, nitrate addition helped reduce soil MeHg concentrations (11-41% lower, 'Straw+BC+N' versus 'Straw+BC') by facilitating nitrate reduction while inhibiting SRB activities. Subsequently, addition of nitrate with biochar, compared with biochar alone, further reduced grain MeHg levels by 34%. Therefore, straw biochar together with nitrate could possibly be effective in mitigating the risk of MeHg under straw amendment. Furthermore, the results evidence the impacts of straw management on the risk posed by MeHg in soils and emphasize the necessity to carefully consider the straw management policy in Hg-contaminated areas.
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Incorporating rice straw resulted in a 28%-136% increase in methyl-Hg levels in Hg-contaminated paddy soil.
“Zhang et al. (2018) made a similar observation, that incorporating rice straw resulted in a 28%-136% increase in methyl-Hg levels in Hg-contaminated paddy soil.”
From Soil amendments for immobilization of potentially toxic elements in contaminated soils: A critical review (2020) · cites this paper as Zhang et al., 2018
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- Authors
- Zhang, Y., Liu, Y.-R., Lei, P., Wang, Y.-J., & Zhong, H.
- Affiliations
- State Key Laboratory of Pollution Control and Resource Reuse (CN)
- Chinese Academy of Sciences (CN)
- Shenzhen University (CN)
- Corresponding author
- Zhong, Huan
- Venue
- Science of The Total Environment
- Publisher
- Elsevier BV
- Published
- 2018-04
- Volume
- 619-620
- Pages
- 384-390
- ISSN
- 0048-9697 (ISSN-L)
- OpenAlex
- W2770006738
- Cited by
- 73
- References
- 67
- Citations by year
- 2026: 4 · 2025: 1 · 2024: 7 · 2023: 8 · 2022: 7 · 2021: 17 · 2020: 11 · 2019: 13 · 2018: 5
- FWCI
- 4.29
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Science of The Total Environment (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (41673075)
- Natural Science Foundation of Jiangsu Province (BK20160067, 41571453)
- Topics
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Mercury impact and mitigation studies
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Keywords
- methylmercury, biochar, nitrate, rice, sulfate-reducing bacteria, sulfate reduction, mercury-contaminated soil, straw management
- MeSH terms
- Charcoal, Methylmercury Compounds, Nitrates, Oryza, Soil, Soil Pollutants
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