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Effects of colistin sulfate residue on  soil microbial community structure.

MA Yi1, PENG Jin-ju1, CHEN Jin-jun1, FAN Ting-li1, SUN Yong-xue2   

  1. (1Department of Veterinary Medicine, College of Agricultural, Guangdong Ocean University, Zhanjiang 524088, Guangdong, China; 2Guangdong Key Laboratory for Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou 510642, China)
  • Online:2014-06-18 Published:2014-06-18

Abstract: By using fumigation extraction and phospholipid fatty acid (PLFA) methods, the change of characteristics of soil microbial community structure caused by residue of colistin sulfate (CS) was studied. The results showed that the CS (wCS≥5 mg·kg-1) had a significant effect on the  microbial biomass carbon (MBC) and it was dosedependent where MBC decreased with the increase of CS concentration in soil. The  MBC in soil decreased by 52.1% when the CS concentration reached 50 mg·kg-1. The total PLFA of soil in each CS treatment was significantly decreased during the sampling period compared with the control group and showed a dosedependent relationship. The soil microbial community structure and diversity in the low CS group (wCS=0.5 mg·kg-1) were not significantly different from the control group on 7th and 49th day. However, they were significantly different on 21st and 35th day especially in the high CS group (wCS=50 mg·kg-1). It was concluded that CS could change the structure of soil microorganisms and varied with time which might be caused by the chemical conversion and degradation of CS in soil.