Effects of corn stalk hydrothermal biochar application on the Cd bioavailability and microbial community in soil
To explore the remediation effects of hydrothermal biochar derived from corn stalk(abbreviated as hydrochar)application on cadmium(Cd)-contaminated soil and the corresponding mechanism,a pot experiment was conducted to analyze the effects of different corn stalk hydrochars under different application ratios(1% and 3% )on the Cd bioavailability in soil and plant uptake.The microbial community structures under different conditions were also explored.Results showed that compared with the blank control(CK),hydrochar application significantly increased the soil organic and organic carbon contents,and diethylenetriamine pentaacetic acid extracted Cd(DTPA-Cd)content in soil and Cd content in rape leaf were decreased by 5.01%-20.98% and 10.82%-4.16%,respectively.The increased hydrothermal temperature and hydrochar application ratio contributed to reducing the DTPA-Cd content in soil.In addition,hydrochar application substantially enhanced the bacterial diversity and abundance in rhizosphere soils and obviously changed the microbial community structure.Compared with the CK,hydrochar application significantly reduced the relative abundance of Actinobacteriota and increased the relative abundances of Proteobacteria and Bacteroidota in rhizosphere soils.Redundancy analysis revealed that the soil dissolved organic carbon content was the key factor that influences the bacterial community structure in rhizosphere soil.Therefore,hydrochar has great potential for the remediation of metal-contaminated soils.However,its long-term effects on soil heavy metals requires further research.
hydrothermal carbonizationhydrocharheavy metalbioavailabilitymicrobial community
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