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Experimental study on weathering of seafloor volcanic glass by bacteria (Pseudomonas fluorescens) - Implications for the contribution of bacteria to the water-rock reaction at the Mid-Oceanic Ridge setting
Chen, Shun1,2; Wu, Zijun2; Peng, Xiaotong1,2
2014-08-15
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
Volume90Pages:15-25
AbstractThe biologically mediated weathering of the ocean crust has received increasing attention in recent decades, but the rates and the possible mechanism of elemental release during microbe-basalt interactions occurring below the seafloor have not been studied in detail. In this study, we established an experimental weathering study of seafloor natural basaltic glass comparing the effect of microbial activity (Pseudomonas fluorescens) in P-rich and P-poor media with parallel controls containing either nonviable cells or organic acid. The changes in the chemical parameters, including pH, bacterial densities, and ion concentrations (Ca, Mg, Si, Mn, Al, Fe, and P) in the solution, were examined during the different batch experiments. The results showed that the pH decreased from 7.0 to 3.5 and the bacterial density increased from 10(5) to 10(8) cells/ml during the first 120 h, and the cell numbers remained constant at 10(8) cells/ml and the pH increased from 3.5 to 6 between 120 h and 864 h in the P-bearing reactors containing bacteria. In contrast, during all the experimental time, the pH remained close to neutral condition in the abiotic control systems and the dissolution rates increased markedly with a decrease in pH and became minimal at near-neutral pH in P-bearing reactors containing bacteria, where Ca, Si, and Mg release rates were 2- to 4-fold higher than those obtained in chemical systems and biotic P-limited systems. Furthermore, the surfaces of the natural volcanic glass from the biotic systems were colonized by bacteria. Simultaneously, the etch pits were observed by Scanning Electron Microscope, which further indicate that the bacteria may promote the mineral dissolution for energy gain. Some elements (e.g., Fe, Mn, and Al) releasing from natural volcanic glass are likely an important source of the elemental budget in the ocean, and thus the element release and its possible mechanism conducted in this experimental study have potential implications on the biogeochemical cycling process in the Mid-Oceanic Ridge setting. (C) 2014 Elsevier Ltd. All rights reserved.
SubtypeArticle
KeywordVolcanic Glass Pseudomonas Fluorescens Batch Experiments Element Release Mid-oceanic Ridge
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.jseaes.2014.04.012
Indexed BySCI
Language英语
WOS KeywordBASALTIC GLASS ; OCEAN CRUST ; DISSOLUTION RATES ; MICROBIAL LIFE ; FELDSPAR DISSOLUTION ; BIOMASS PRODUCTION ; DEEP-SEA ; DIVERSITY ; MICROORGANISMS ; SILICATES
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000338394700002
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/458
Collection深海科学研究部_深海地质与地球化学研究室
Affiliation1.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
2.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
First Author AffilicationInstitute of Deep-sea Science and Engineering,CAS
Recommended Citation
GB/T 7714
Chen, Shun,Wu, Zijun,Peng, Xiaotong. Experimental study on weathering of seafloor volcanic glass by bacteria (Pseudomonas fluorescens) - Implications for the contribution of bacteria to the water-rock reaction at the Mid-Oceanic Ridge setting[J]. JOURNAL OF ASIAN EARTH SCIENCES,2014,90:15-25.
APA Chen, Shun,Wu, Zijun,&Peng, Xiaotong.(2014).Experimental study on weathering of seafloor volcanic glass by bacteria (Pseudomonas fluorescens) - Implications for the contribution of bacteria to the water-rock reaction at the Mid-Oceanic Ridge setting.JOURNAL OF ASIAN EARTH SCIENCES,90,15-25.
MLA Chen, Shun,et al."Experimental study on weathering of seafloor volcanic glass by bacteria (Pseudomonas fluorescens) - Implications for the contribution of bacteria to the water-rock reaction at the Mid-Oceanic Ridge setting".JOURNAL OF ASIAN EARTH SCIENCES 90(2014):15-25.
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