期刊
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
卷 122, 期 12, 页码 3113-3125出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017JG004050
关键词
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资金
- Fundamental Research Funds for the Central Universities of China [2017B694X14, 2015B24814, 2016B00714, 2015B15814, 2015B25614]
- National Natural Science Foundation of China (NSFC) [51579072, 51620105005, 51379003, 41606104]
- Natural Science Foundation of Jiangsu Province [BK20160862]
- Jiangsu Provincial Policy Guidance Programme [BY2015002-05]
- MASTS pooling initiative
- Scottish Funding Council [HR09011]
Biofilms, consisting of microorganisms and their secreted extracellular polymeric substances (EPSs), serve as ecosystem engineers stabilizing sedimentary environments. Natural sediment bed provides an excellent substratum for biofilm growth. The porous structure and rich nutrients allow the EPS matrix to spread deeper into the bed. A series of laboratory-controlled experiments were conducted to investigate sediment colonization of Bacillus subtilis and the penetration of EPS into the sediment bed with incubation time. In addition to EPS accumulation on the bed surface, EPS also penetrated downward. However, EPS distribution developed strong vertical heterogeneity with a much higher content in the surface layer than in the bottom layer. Scanning electron microscope images of vertical layers also displayed different micromorphological properties of sediment-EPS matrix. In addition, colloidal and bound EPSs exhibited distinctive distribution patterns. After the full incubation, the biosedimentary beds were eroded to test the variation of bed stability induced by biological effects. This research provides an important reference for the prediction of sediment transport and hence deepens the understanding of the biologically mediated sediment system and broadens the scope of the burgeoning research field of biomorphodynamics.
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