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
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
卷号90页码:15-25
摘要The 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.
文章类型Article
关键词Volcanic Glass Pseudomonas Fluorescens Batch Experiments Element Release Mid-oceanic Ridge
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.jseaes.2014.04.012
收录类别SCI
语种英语
关键词[WOS]BASALTIC GLASS ; OCEAN CRUST ; DISSOLUTION RATES ; MICROBIAL LIFE ; FELDSPAR DISSOLUTION ; BIOMASS PRODUCTION ; DEEP-SEA ; DIVERSITY ; MICROORGANISMS ; SILICATES
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000338394700002
引用统计
被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.idsse.ac.cn/handle/183446/458
专题深海科学研究部_深海地质与地球化学研究室
作者单位1.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
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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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