Resilience of soil microbiome and enzyme activity with soil amelioration of Bayer process red mud
DONG Meng-yang1, DONG Yuan-peng1, XU Zi-wen1, SHAO Yi-fei1, LIU Xi-juan1, HU Xin-xin2, LIU Ai-ju2
1. School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255091, China; 2. School of Resources and Environment Engineering, Shandong University of Technology, Zibo 255091, China
Abstract:Soil treatment is the key to the scale harmless disposal and ecological restoration of red mud. In this study, vermiculite and fly ash were used as matrix improvers, and garden leaves were used as the source of organic matter. To evaluate the ecological restoration of the treated red mud, the physical and chemical indexes (such as pH, EC, CEC, the content of nitrogen (NO3--N)) and the dynamic changes of microbial indexes such as microbial community functional diversity, community structure, enzyme activity, etc., were analyzed regularly over a year outdoor incubation. The results showed that amendment of both vermiculite and fly ash could significantly reduce the specific gravity of red mud matrix and increase its porosity. After a near year of outdoor incubation, the pH and EC of the red mud matrix decreased from 11.25 and 1.05 mS/cm to 8.49 and 0.27 mS/cm, respectively, and the NO3--N content increased from 8.72mg/kg to 72.17mg/kg. The corresponding activities of dehydrogenase, urease and alkaline phosphatase were gradually approaching to the reference soil. The diversity of microbial community increased gradually, the community structure changed significantly, and then followed by the recovery of microbial metabolic function gradually. By the comprehensive comparison on the restoration effect of each treatment, it showed that under the same amount of organic matter, the treatment effect of fly ash addition was better than that of vermiculite addition, which can accelerate the process of red mud soil, and provide scientific basis for the study of red soil remediation and large-scale treatment.
董梦阳, 董远鹏, 徐子文, 邵翼飞, 刘喜娟, 胡欣欣, 刘爱菊. 赤泥改良过程中微生物群落及酶活性恢复研究[J]. 中国环境科学, 2021, 41(2): 913-922.
DONG Meng-yang, DONG Yuan-peng, XU Zi-wen, SHAO Yi-fei, LIU Xi-juan, HU Xin-xin, LIU Ai-ju. Resilience of soil microbiome and enzyme activity with soil amelioration of Bayer process red mud. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 913-922.
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