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生态学杂志 ›› 2012, Vol. 31 ›› Issue (06): 1447-1452.

• 研究报告 • 上一篇    下一篇

反硝化芽孢杆菌的筛选鉴定及反硝化特性

郑喜春1,郭晓军1,姚娜2,曹晓璐2,李潞滨2,朱宝成1**   

  1. (1河北农业大学生命科学学院, 河北保定 071001; 2中国林业科学研究院林业研究所, 国家林业局林木培育重点实验室, 北京 100091)
  • 出版日期:2012-06-09 发布日期:2012-06-09

Screening and identification of denitrifying bacillus strain and its denitrification characteristics.

ZHENG Xi-chun1, GUO Xiao-jun1, YAO Na2, CAO Xiao-lu2, LI Lu-bin2, ZHU Bao-cheng1**   

  1. (1College of Life Sciences, Agricultural University of Hebei, Baoding 071001, Hebei, China; 2 Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration Research, Research Institute of Forestry, Chinese Academy of Forestry,  Beijing 100091, China)
  • Online:2012-06-09 Published:2012-06-09

摘要: 采用加热富集及硝酸盐还原产气试验和反硝化活力定量分析,从乌梁素海的底泥中筛选出了一株具有高效反硝化性能的芽孢杆菌,命名为TGR30。通过形态观察、生理生化试验及16S rDNA序列同源性分析,将其鉴定为巨大芽孢杆菌(Bacillus megaterium)。通过单因素试验明确了碳源、碳氮比、盐浓度、pH以及溶解氧与反硝化特性的关系。结果表明,该菌在盐度为6%或pH 12时都具有较高的反硝化活性;以可溶性淀粉为唯一碳源、C/N为14、pH 8.0、DO为4 mg·L-1时脱氮效果最佳,脱氮率为92%。

关键词: 温室, 土壤水分, 土壤温度, 水热比值

Abstract: By the methods of heating accumulation, nitrate-reduction gas production, and quantitative analysis of denitrification, a bacillus strain with highefficient denitrifying capability named as TGR30 was isolated from the sediment of Wuliangsuhai Lake. The isolate was identified as Bacillus megaterium, based on its morphological feature, biochemical characteristics, and 16S rDNA sequence analysis. Single factor experiment was conducted to investigate the influences of medium carbon, C/N, salinity, pH, and dissolved oxygen on the denitrifying characteristics of the strain. When the medium salinity was 6% or the pH value was 12, the strain still had high nitrogen removal capability, and the optimal conditions for the nitrogen removal were the medium C/N ratio 14, pH value 8.0, and dissolved oxygen concentration 4 mg·L-1 when soluble starch was used as the sole carbon source.

Key words: greenhouse, soil moisture, soil temperature, ratio of soil water to heat.