生物炭
修正案
微生物种群生物学
环境化学
环境修复
生物利用度
土壤污染物
土壤污染
土壤水分
化学
环境科学
生物
污染
土壤科学
生态学
细菌
热解
有机化学
政治学
生物信息学
法学
遗传学
作者
Yongshan Wan,Richard Devereux,S. Elizabeth George,Jianjun Chen,Bin Gao,Matt Noerpel,Kirk G. Scheckel
标识
DOI:10.1016/j.jhazmat.2021.127921
摘要
This study determined the interactive effects of biochar and lead toxicity on the soil microbial community in a phytoextraction experiment. Arranged with a completely randomized design in a greenhouse, banana liners were planted singly in a sandy soil spiked with Pb(NO3)2 at 0, 400 and 1200 mg kg−1 and amended with bamboo biochar (pyrolyzing at 600 °C) at 0, 1, 3%. Soil samples were taken from triplicated pots five months after planting and measured for (i) content of lead and organic carbon; (ii) lead speciation; and (iii) microbial community composition through 16S rRNA gene sequencing. DNA sequencing results showed that lead and biochar treatments had significant individual and interactive effects on soil microbial dissimilarities from taxonomic levels of phyla to genera. While some specific taxa were lead resistant, biochar addition apparently alleviated lead toxicity and increased their richness (e.g., Alkanibacter, Muciaginibacter, Burkholderiaceae, and Beggiatoaceae). Soil analysis data indicated that biochar not only helped retain more lead in the soil matrix but created a soil environment inducive for transformation of lead into highly insoluble pyromorphite. This study highlights the effectiveness of biochar for lead remediation and the sensitivity of soil microorganisms in sensing changes in soil environment and lead bioavailability.
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