Transformation of nitrate nitrogen by three strains of bacteria isolated from facility culturing soils
Three bacterial strains capable of transforming nitrate nitrogen designated as NCT-2, NCT-3 and NCT-4, were isolated from excessive nitrate nitrogen salinization soils. According to the sequence analysis of the partial 16s rRNA gene, it is found that strains NCT-2 and NCT-4 belong to Bacillus sp., and strain NCT-3 belongs to Stenotrophomonas sp. The effects of nitrate nitrogen concentration, pH and temperature on transformation were examined. At a concentration of 50.0 mg L -1 , More than 93.3% of nitrate nitrogen was transformed by Bacillus sp. NCT-after 5d and 72.3% by Stenotrophomonas sp. NCT-3 after 5d. At a concentration of 400.0 mg L -1 , the transformation rate was inhibited. Only 40.3% of nitrate nitrogen can be transformed by Bacillus sp. NCT-4 after 5d. More than 63.3% transformation rate was observed with Stenotrophomonas sp. NCT-3 after 5d. The growth of these three strains was inhibited at high pH buffers. The abiotic transformation was basically the same at different pH conditions. The transformation rate of nitrate nitrogen at 25℃ was faster than those at 20℃ and 35℃ by these strains, except the highest degradation rate of Bacillus sp. NCT-was obtained at 35℃.
Weiwei Shi Chunhua Zhang Yuee Zhi Pei Zhou
Key Laboratory of Urban Agriculture South of Ministry of Agriculture Shanghai Jiao Tong University Shanghai, China
国际会议
成都
英文
1-4
2010-06-18（万方平台首次上网日期，不代表论文的发表时间）