Cited by 73Mercury impact and mitigation studiesHeavy metals in environmentSoil Carbon and Nitrogen Dynamics

Biochar and nitrate reduce risk of methylmercury in soils under straw amendment

Zhang, Yue, Liu, Yu-Rong, Lei, Pei, Wang, Yong-Jie, Zhong, Huan·2018·Science of The Total Environment

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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Crossref · 10.1016/j.scitotenv.2017.11.106

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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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