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Dynamic Changes in Bacterial Communities During Compost and Earthworm Treatment of Low-Grade Potassium Ore TEXT SIZE: A A A

Both composting and earthworm treatment can degrade potassium rock powders and bacteria play a key role during the bio-processings. To understand the dominant bacteria and bacterial profile in biological conversion of the ore including compost and earthworm treatment, the bacterial communities in the compost were studied by using the method of denaturing gradient gel electrophoresis (DGGE) after ore powder was co-composted with organic wastes and then treated with earthworms. Results showed bacterial community structure changed very quickly during the early stages of solid-state fermentation, but relatively stable in the later stages of fermentation and during earthworm treatment. The dominant species of bacteria largely varied in the earlier stage of composting, but they were stable in the latter stage and during earthworm treatment. Two classes of bacteria, represented by band 12 (likely Alteromonas) and band 14 (likely Firmicutes) in DGGE profile, were found to be dominant species over the entire solid-state fermentation period. No special dominant bacterial species appeared during earthworm treatment. Phylogenetic studies of the bacteria based on 16S rRNA sequences indicate that major 13 bands came from phyla Proteobacteria and Firmicutes, suggesting that bacteria in these phyla played an important role during the compost treatment.

Publication name

 GEOMICROBIOLOGY JOURNAL Volume: 30  Issue: 7  Pages: 653-661 Published: AUG 9 2013

Author(s)

 Liu, Dian-Feng; Wang, Bin; Lian, Bin

Corresponding author  

 LIAN Bin
 bin2368@vip.163.com
 1. Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China
  2. Nanjing Normal Univ, Coll Life Sci, Jiangsu Engn & Technol Res Ctr Microbiol, Jiangsu Key Lab Microbes & Funct Genom, Nanjing, Jiangsu, Peoples R China

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