研究报告

  • 段曼莉,李志健,周蓓蓓,张振师,李玉进,王兆兴.蒙脱石对污染土壤中Cu、细菌群落及生菜生长的影响[J].环境科学学报,2022,42(6):405-414

  • 蒙脱石对污染土壤中Cu、细菌群落及生菜生长的影响
  • Effects of montmorillonite on Cu, bacterial community and lettuce growth in contaminated soil
  • 基金项目:陕西省自然科学基金(No.2019M653707);国家自然科学基金青年科学基金(No.41807131);中国博士后基金项目(No.2019M653707)
  • 作者
  • 单位
  • 段曼莉
  • 西安理工大学省部共建西北旱区生态水利国家重点实验室,西安 710048
  • 李志健
  • 西安理工大学省部共建西北旱区生态水利国家重点实验室,西安 710048
  • 周蓓蓓
  • 西安理工大学省部共建西北旱区生态水利国家重点实验室,西安 710048
  • 张振师
  • 中国电建集团西北勘测设计研究院有限公司,西安 710065
  • 李玉进
  • 中国电建集团西北勘测设计研究院有限公司,西安 710065
  • 王兆兴
  • 中国葛洲坝集团第三工程有限公司,西安 710076
  • 摘要:为探究蒙脱石(Montmorillonite, MM)对污染土壤中Cu、细菌群落和生菜生长的影响,本研究建立了不同Cu含量(100、200、400 mg·kg-1)及在5种MM添加水平(0、2%、4%、6%和8%,质量分数)下的盆栽试验.结果表明,土壤Cu含量分别为100、200和400 mg·kg-1时,6%MM、8%MM和8%MM施加量均可促进生菜生长,且体内Cu含量最低,相对于CK处理(CK100、CK200和CK400),生菜中Cu含量分别降低了18.1%、12.8%和11.5%.适宜的MM可显著降低土壤中Cu的可利用形态.MM能改变土壤细菌群落的组成和结构,如SphingomonasStreptomycesBacillus等有益细菌属的相对丰度升高.冗余分析(RDA)结果表明,SphingomonasBacillusStreptomyces通过调节土壤pH、Cu形态、NH4+-N含量来减少Cu在植物中的累积从而促进植株的逆境生长.本研究结果可为不同程度土壤Cu污染修复提供一定的理论支撑.
  • Abstract:In order to investigate the effects of Montmorillonite (MM) on Cu, bacterial community and lettuce growth in contaminated soil, pot experiments with different Cu concentrations (100, 200, 400 mg·kg-1) and five addition levels (0, 2%, 4%, 6% and 8% W/W) were established. The results showed that when soil Cu concentrations were 100, 200 and 400 mg·kg-1, 6%MM, 8%MM and 8%MM promoted the growth of lettuce, and the Cu contents in lettuce were the lowest. Compared with CK100, CK200 and CK400, Cu contents in lettuce decreased by 18.1%, 12.8% and 11.5%, respectively. Suitable MM significantly reduced the available forms of Cu in soil. MM can change the composition and structure of soil bacterial community, such as SphingomonasStreptomycesBacillus and so on. The results of RDA analysis showed that SphingomonasBacillus and Streptomyces could reduce the accumulation of Cu in plants by regulating soil pH, Cu morphology and NH4+-N content, thus so as to accelerate plant growth under stress. The results of this study can provide theoretical support for the remediation of different degrees of soil Cu pollution.

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