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采用盆栽试验，研究了生物炭及低、高剂量磁性生物炭对水稻根际砷形态转化、铁膜形成、微生物群落变化及水稻砷积累特征.结果表明：施用磁性生物炭显著降低根际孔隙水中砷浓度，促进砷从活性态向铁结合态转化；提升根际氧化还原电位，使根表铁膜中铁含量增加1.60-2.02倍；抑制铁还原菌(地杆菌属降低61.5%)而促进铁氧化菌(嘉利翁氏菌属提高1.8倍).与对照相比，高剂量磁性生物炭处理籽粒砷含量降低68.2%，为0.20 mg·kg-1，低于食品安全标准.研究表明磁性生物炭通过化学吸附-铁膜屏障-调控微生物等协同阻隔砷迁移过程，为稻田砷污染修复提供了科学依据.
Abstract：In order to explore the rhizosphere microenvironment regulation mechanism of magnetic biochar blocking As uptake in rice, a pot trial including the treatment groups(control, raw biochar and low-/high-rate magnetic biochar). Arsenic speciation dynamics in rhizosphere,iron plaque formation, change of microbe communities and As accumulation in rice. The results demonstrated that magnetic biochar could decrease As concentration in rhizosphere porewater(71.3%)and promote As transformation from labile fraction to Fe fraction, elevate rhizosphere EORP value and increase root Fe-Plaque contents(1.02 fold). Besides, it inhibited Fe-reducing bacteria(e.g.Geobacter decreased by 61.5%)but promoted Fe-oxidizing bacteria(e.g. Gallionella increased by1.8). As a result, grain As content decreased by 68.2%,reaching 0.20 mg·kg-1and satisfying the food standard requirements; this research clarifies that the combined use of magnetic biochar can effectively inhibit the transfer of As by physical adsorption via chemical adsorption, iron plaque barrier enhancement, and microbial regulation to provide a scientific basis for remediation of As contaminated paddy field.
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基本信息:
中图分类号:X53;S511
引用信息:
[1]林丽娜,刘青海,董又铭,等.磁性生物炭调控水稻根际微环境阻隔砷迁移的效应[J].汕头大学学报(自然科学版),2026,41(03):3-11+2.
基金信息:
西藏自治区科技计划项目（基地与人才计划）（XZ202502JD0038）
2026-08-15
2026-08-15