摘要
微塑料和重金属在土壤中广泛分布,其相互作用对生态环境系统构成严重威胁。生物炭作为一种土壤改良剂,因具备有效提升土壤质量的潜力而备受关注,但现有研究对微塑料介导下生物炭在重金属稳定化中的作用关注较少。该研究以汉中市某矿区土壤为研究对象,通过盆栽实验,探讨不同施加量的生物炭(0.1%、0.5%、1.0%)对含有微塑料土壤中Cd和Pb迁移转化效率的影响及其对小白菜生理特性的作用。结果表明,随着生物炭施加量从0.1%增加至1.0%,土壤pH值、有机质含量、酶活性以及小白菜生物量(地上和地下部分)均显著提升。当生物炭施加量为1.0%时,土壤中有效态Cd和Pb分别降低33.7%和47.8%,脲酶和碱性磷酸酶活性分别提高80.3%和68.9%。此外,重金属富集系数随着生物炭施加量的增加逐渐降低,而转运系数则逐渐升高。1.0%生物炭的施加效果最为显著,能够显著降低含有微塑料土壤中重金属的可利用性,同时改善植株生长状况,表明生物炭在修复含有微塑料的重金属污染土壤中具有巨大潜力。
Microplastics and heavy metals are widely distributed in soil,and their interaction poses a serious threat to the ecological environment system.As a soil amendment,biochar has attracted much attention because of its potential to effec⁃tively improving soil quality,but the existing research has paid less attention to the role of biochar in the stabilization of heavy metals mediated by microplastics.In this study,the soil of a mining area in Hanzhong City was used as the re⁃search object.Through pot experiments,the effects of different amounts of biochar(0.1%,0.5%,1.0%)on the migration and transformation efficiency of Cd and Pb in soil containing microplastics and their effects on the physiological char⁃acteristics of Chinese cabbage were discussed.The results showed that with the increase of biochar application from 0.1%to 1.0%,soil pH,organic matter content,enzyme activity and Chinese cabbage biomass(aboveground and underground parts)were significantly increased.When the amount of biochar applied was 1.0%,the available Cd and Pb in the soil decreased by 33.7%and 47.8%,respectively.The activities of urease and alkaline phosphatase were increased by 80.3%and 68.9%,respectively.In addition,the enrichment coefficient of heavy metals gradually decreased with the increase of biochar application,while the transport coefficient gradually increased.The application effect of 1.0%biochar was the most significant,which could significantly reduce the availability of heavy metals in soil containing microplastics and im⁃prove plant growth,indicating that biochar had great potential in remediation of heavy metal contaminated soil containing microplastics.
作者
齐文博
赵航航
李鹏飞
贺乐
崔文全
邵怡
李巧云
宋凤敏
QI Wenbo;ZHAO Hanghang;LI Pengfei;HE Le;CUI Wenquan;SHAO Yi;LI Qiaoyun;SONG Fengmin(School of Chemistry and Environmental Science,Shaanxi University of Technology,Hanzhong 723000,China)
出处
《环境科学与技术》
北大核心
2025年第8期133-141,共9页
Environmental Science & Technology
基金
陕西省教育厅一般专项科学研究计划项目(24JK0366)
陕西省科技厅青年基金项目(2024JC-YBQN-0252)。
