生态环境学报Issue(3)：457-463,7.
源地沙尘对南海东北部海域异养细菌生物量及群落结构的影响
Effect of dust on heterotrophic bacterial biomass and community structure in northeastern South China Sea
侯瑞 1白洁 2高会旺 1赵阳国 2张晓浩1
作者信息
- 1. 中国海洋大学海洋环境与生态教育部重点实验室，山东 青岛 266100
- 2. 中国海洋大学环境科学与工程学院，山东 青岛 266100
- 折叠
摘要
Abstract
Dust deposition, one of the sources of marine nutrients, played a critical role in community dynamics of marine heterotrophic bacteria. Enrichment experiments were carried out in March 2013 at stations A1 and A2 in northeastern South China Sea to evaluate the process and mechanism of the dust originated from a dust storm outbreak affecting the biomass and community structure of heterotrophic bacteria. The results indicated that the heterotrophic bacterial biomass was low in the northeastern South China Sea and the dust could relieve nutrient limitation through inputs of DOC and DIN. Particularly, the dust with small grain size increased the DOC and DIN concentration in seawater by a factor of 0.65 and 0.36, respectively. The addition of dust triggered an increase in heterotrophic bacterial biomass in both stations. Dust addition alone facilitated heterotrophic bacterial biomass both in the long-term and short-term experiments, whereas the small grain size dust showed more significant effect in the long-term experiments than those in the short-term. With the simultaneous addition of nitrogen and phosphorus, the dust couldn’t enhance bacterial significantly, or even decreased bacterial biomass in the long-term experiments. Comparing the bacteria community with the dust addition before and after an incubation period of 7 days at station A1, we found that the bacterial biodiversity were decreased and bacteria community simplified after incubation, especially for the small grain size dust. The bacteria community structure responded similarly to the two types of dust, with Alphaproteobacteria and Gammaproteobacteria turning into dominant species after incubation whereas Chloroplast losing its dominance, and consequently the bacteria community becoming more heterothrophic. In conclusion, the dust originated from dust storms could obviously promote heterotrophic bacterial growth, significantly change its community structure, and enhance its function in marine ecosystem.关键词
南海东北部/源地沙尘/异养细菌生物量/细菌群落结构Key words
the northeastern South China Sea/storm dust/heterotrophic bacteria/community structure分类
海洋科学引用本文复制引用
侯瑞,白洁,高会旺,赵阳国,张晓浩..源地沙尘对南海东北部海域异养细菌生物量及群落结构的影响[J].生态环境学报,2014,(3):457-463,7.
