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应用生态学报 ›› 2020, Vol. 31 ›› Issue (9): 3111-3118.doi: 10.13287/j.1001-9332.202009.036

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巨大芽孢杆菌对伴矿景天修复镉污染农田土壤的强化作用

邓月强1, 曹雪莹2, 谭长银1*, 孙丽娟1, 彭曦1, 柏佳1, 黄硕霈1   

  1. 1湖南师范大学资源与环境科学学院, 环境重金属污染机理及生态修复重点实验室, 长沙 410081;
    2长沙学院乡村振兴研究院, 长沙 410022
  • 收稿日期:2020-02-17 接受日期:2020-06-16 出版日期:2020-09-15 发布日期:2021-03-15
  • 通讯作者: * E-mail: chytan@hunnu.edu.cn
  • 作者简介:邓月强, 男, 1995年生, 硕士研究生。主要从事土壤环境与农产品安全研究。E-mail: yueqiangdeng@163.com
  • 基金资助:
    湖南省科技计划重点项目(2017NK2141)和湖南省国内一流培育学科建设项目(5010002)资助

Strengthening the effect of Bacillus megaterium on remediation of Cd-contaminated farmland soil by Sedum plumbizincicola

DENG Yue-qiang1, CAO Xue-ying2, TAN Chang-yin1*, SUN Li-juan1, PENG Xi1, BAI Jia1, HUANG Shuo-pei1   

  1. 1Key Laboratory of Environmental Heavy Metal Pollution Mechanism and Ecology Remediation, College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China;
    2Rural Vitalization Research Institute, Changsha University, Changsha 410022, China
  • Received:2020-02-17 Accepted:2020-06-16 Online:2020-09-15 Published:2021-03-15
  • Contact: * E-mail: chytan@hunnu.edu.cn
  • Supported by:
    the Key Research and Technology Project of Hunan Province (2017NK2141) and the Construction Program for First-Class Disciplines of Hunan Province, China (5010002).

摘要: 伴矿景天(Sedum plumbizincicola)是一种Cd/Zn超积累植物,常用于Cd污染土壤的植物修复。巨大芽孢杆菌(Bacillus megaterium)是一种溶磷型细菌,既可以促进植物生长,也可以提高土壤重金属生物有效性,对重金属污染土壤植物修复具有强化作用。本研究采用盆栽试验方法,分析了巨大芽孢杆菌不同接种量(10~60 mL)对伴矿景天修复Cd污染农田土壤效率的影响。结果表明: 在Cd污染农田土壤中接种巨大芽孢杆菌可以提高土壤中Cd的活性,土壤有效态Cd含量较对照(CK)增加15.0%~45.0%。与CK相比,巨大芽孢杆菌提高了伴矿景天地上和地下部的生物量,增幅分别为8.7%~66.7%和13.6%~81.8%,并显著增加了伴矿景天地上部的Cd含量,增幅在29.2%~60.4%。在种植伴矿景天并接种巨大芽孢杆菌条件下,土壤Cd去除率在26.7%~42.9%。这说明接种巨大芽孢杆菌可以促进伴矿景天的生长,增加其Cd含量,从而提高Cd污染农田土壤的修复效率。

关键词: 巨大芽孢杆菌, 伴矿景天, 植物修复, Cd污染土壤, Cd有效性

Abstract: Sedum plumbizincicola is a Cd and Zn hyperaccumulator, widely used for the phytoremediation of Cd-contaminated soil. Bacillus megaterium, a phosphate-solubilizing bacteria, can promote plant growth and improve the bioavailability of heavy metals in soil, and thus has a strengthening effect on the remediation of heavy metal-contaminated soil. Here, a pot experiment was carried out with S. plumbizincicola as a hyperaccumulator to investigate the effects of different inoculation amounts (10-60 mL) of B. megaterium on the phytoremediation efficiency of Cd-contaminated farmland soils. The results showed that inoculation of B. megaterium increased soil available Cd content by 15.0%-45.0% compared with the CK. Biomass of shoots and roots of S. plumbizincicola increased by 8.7%-66.7% and 13.6%-81.8%, respectively. Shoot Cd concentration was significantly increased by the application of B. megaterium by 29.2%-60.4%. Under the conditions of S. plumbizincicola inoculated with B. megaterium, Cd removal rate of soil reached 26.7%-42.9%. In conclusion, application of B. megaterium in phytoremediation significantly enhanced the Cd removal efficiency and increased plant biomass, which promoted Cd remediation efficiency.

Key words: Bacillus megaterium, Sedum plumbizincicola, phytoremediation, Cd contamination soil, Cd availability