Impact of soybean stover- and pine needle-derived biochars on Pb and As mobility, microbial community, and carbon stability in a contaminated agricultural soil

Mahtab Ahmad, Yong Sik Ok, Byung Yong Kim, Jae Hyung Ahn, Young Han Lee, Ming Zhang, Deok Hyun Moon, Mohammad I. Al-Wabel, Sang Soo Lee

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Biochar is gaining attention as a potential soil amendment to remediate and revitalize the contaminated soils. Simultaneous effects of biochar on metals mobility, microbial abundance, bacterial diversity and carbon storage in soil are scarcely addressed. This study assessed the effect of biochars on metal mobility, microbial abundance, bacterial community, and carbon storage in an agricultural soil contaminated with heavy metals. Biochars derived from soybean stover at 300 and 700 °C (S-BC300 and S-BC700, respectively) and pine needles at the same temperatures (P-BC300 and P-BC700, respectively) were used. A maximum reduction of Pb mobility by 95% was observed from a soil treated with S-BC700, associated with precipitation of chloropyromorphite and hydroxylpyromorphite. In contrast, As was desorbed from soil particles because of P competition. The abundance of Gram-positive and negative bacteria, fungi, actinomycetes, and arbuscular mycorrhizal fungi increased in the soils treated with biochar produced at 300 °C, possibly due to the high dissolved organic and active organic carbons. Microbial abundance in the soils treated with S-BC700 and P-BC700 was constant due to the existence of fixed or non-labile carbon. Changes to bacterial communities in the biochar-treated soils depended on feedstock type and pyrolysis temperature. Actinobacteria substantially increased whereas Acidobacteria and Chloroflexi decreased in the biochar-treated soils. The non-labile carbon fraction was ~25 fold higher in the biochar-treated soil than the control soil, indicating long-term carbon storage.

Original languageEnglish
Pages (from-to)131-139
Number of pages9
JournalJournal of Environmental Management
Volume166
DOIs
Publication statusPublished - 2016 Jan 15
Externally publishedYes

Keywords

  • Bacterial community
  • Biochar
  • Carbon storage
  • Heavy metals
  • Immobilization
  • Precipitation

ASJC Scopus subject areas

  • Environmental Engineering
  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

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