盐度对北极海冰细菌生长的影响

从中国第二次北极科学考察采集的海冰样品中分离到8种细菌,研究了盐度对其生长的影响。结果表明,8株海冰细菌对盐度有着广泛的适应性,在盐度为30-90的范围内均可较快生长,其中菌株BJ2、BJ3和BJ7的盐耐受性较强。进一步的研究表明,BJ2、BJ3和BJ7在0-150 的盐度范围内均有不同程度的生长,盐度为0-30时,菌株的生长最快;盐度为180时,这三株菌株也均有短暂的生长。随着盐度的增加,三株菌株生长的延迟期增加,到达生长稳定期的时间也相应增加。温度对菌株BJ2、BJ3和BJ7的盐耐受性也有着一定的影响,随着温度的升高, 菌株的生长速度变慢,但盐耐受性有所增加。

Elemental and Isotopic Signatures in the Sediments Influenced by Seal Excrement on Antarctic Fildes Peninsula and Their Potential Paleoecological Applications

8 strains of bacteria were isolated from Arctic sea ice collected during Chinese Second Arctic Scientific Expedition. The effects of salinity on the growth of these strains were studied in this paper. The results showed that the bacteria isolated from sea ice had extensive salinity tolerance. They could grow quickly in salinity from 30 to 90, of these strain, B J2, B J3 and BJ7 showed higher salinity tolerance. The further study showed that these 3 strains could grow in a wide range salinity from 0 to 150, and they could grow temporarily even in salinity as high as 180. The lag growth phase, as well as the stationary phase was delayed with the increase of salinity. Temperature had some effects on the salinity tolerance of strain B J2, B J3 and B J7. The higher the temperature, the more slowly the 3 strains grew. High temperature also could enchance the salinity tolerance of the 3 strains in a way.