通过一株分枝杆菌增强对多环芳烃和镉污染土壤的植物修复。
Enhanced phytoremediation of PAHs and cadmium contaminated soils by a Mycobacterium.
机构信息
Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China; Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China.
出版信息
Sci Total Environ. 2021 Feb 1;754:141198. doi: 10.1016/j.scitotenv.2020.141198. Epub 2020 Jul 24.
This study investigated Fire Phoenix (Festuca L.) and Echinacea purpurea (L.) Moench inoculated with a Mycobacterium strain N12 in remediation of soils contaminated with both polycyclic aromatic hydrocarbons (PAHs) and cadmium (Cd). Plant growth and PAH and Cd removal were monitored in 60, 120, and 150 days after transplanting. Results showed that Fire Phoenix plants grown in soil containing 200 mg/kg PAHs and 15 mg/kg Cd inoculated with N12 were able to remove 76.3% PAHs compared to removal of 68.3% of PAHs by the plants without N12 inoculation. On day 150, the underground biomass of Fire Phoenix plants grown in soil inoculated with N12 increased 59.40% compared to that without N12 inoculation. The enhanced removal of PAH by Fire Phoenix and N12 was related to the improved rhizosphere microbial activities. However, inoculation of N12 to E. purpurea grown soil did not significantly improve the removal of PAHs and Cd. Our results showed that phytoremediation of PAHs and Cd can be enhanced by a Mycobacterium strain N12, especially when PLFA concentrations of bacteria and fungi exceeded 60% of the initial concentrations, but the enhancement is plant species dependent.
本研究调查了接种 Mycobacterium 菌株 N12 的 Fire Phoenix（早熟禾属）和 Echinacea purpurea（紫锥菊属）在修复同时受到多环芳烃（PAHs）和镉（Cd）污染的土壤中的作用。在移栽后 60、120 和 150 天时监测了植物生长以及 PAH 和 Cd 的去除情况。结果表明，与未接种 N12 的植物相比，在含有 200mg/kg PAHs 和 15mg/kg Cd 的土壤中生长并接种 N12 的 Fire Phoenix 植物能够去除 76.3%的 PAHs。在第 150 天，接种 N12 的土壤中生长的 Fire Phoenix 植物的地下生物量比未接种 N12 的植物增加了 59.40%。Fire Phoenix 和 N12 增强了对 PAH 的去除与根际微生物活性的提高有关。然而，向生长有 E. purpurea 的土壤中接种 N12 并不能显著提高 PAHs 和 Cd 的去除。我们的研究结果表明，Mycobacterium 菌株 N12 可以增强 PAHs 和 Cd 的植物修复，特别是当细菌和真菌的 PLFA 浓度超过初始浓度的 60%时，但这种增强作用取决于植物物种。
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