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首页> 外文期刊>Marine Chemistry >Significant bacterial transformation of riverine humic matter detected by pyrolysis GC-MS in serial chemostat experiments
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Significant bacterial transformation of riverine humic matter detected by pyrolysis GC-MS in serial chemostat experiments

机译：热裂解GC-MS在连续化学恒温器实验中检测到的河滨腐殖质的重要细菌转化

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摘要

To examine bacterial degradation of dissolved organic matter (DOM) in an estuarine salinity gradient we set up three-stage chemostats, inoculated by natural brackish (salinity 5 and 15) and coastal marine (salinity 30) bacterial communities. They were fed by freshwater DOM rich in humic substances (HS) adjusted to the respective salinity and run at dilution rates of 0.1 and 0.15 d~(-1). Decomposition of the total DOM and fulvic acid (FA), humic acid (HA) and hydrophilic acid fractions (HPAs) of HS was assessed over the incubation time of up to 51 days. The composition of the HS was further analyzed by pyrolysis-GC/MS (py-GC/MS). The DOM was largely dominated by lignin-derived organic matter originating from grass but also contained angiosperm-derived lignins. At salinity 30, the humic-rich DOM was decomposed to more than 60% and all HS fractions were reduced substantially, whereas in the other two experiments no detectable decomposition and only minor changes in the HS fractions occurred. In the salinity 30 experiment, the composition of the HA fraction changed substantially whereas that of the FA and HPA fractions exhibited minor changes. Acid to aldehyde (Ad/Al) ratios of the major phenolic lignin-derived organic compounds indicated a rather high degree of oxidation of the natural HS. However, during decomposition Ad/Al ratios of syringyl and vanillyl phenols decreased, thus indicating a high degree of decomposition, i.e. decarboxylation, of these lignin-derived compounds. The results indicate that decomposition by marine bacterial communities is an important sink of terrestrially derived refractory DOM in the intertidal flat coastal region.
机译：为了检查河口盐度梯度中溶解性有机物（DOM）的细菌降解，我们建立了三阶段的恒化器，由天然咸淡水（盐度5和15）和沿海海洋（盐度30）细菌群落接种。它们由富含腐殖质（HS）的淡水DOM喂食，DOM调整至各自的盐度，并以0.1和0.15 d〜（-1）的稀释率运行。在长达51天的孵育时间内，评估了HS的总DOM和黄腐酸（FA），腐殖酸（HA）和亲水性酸级分（HPA）的分解。通过热解-GC / MS（py-GC / MS）进一步分析HS的组成。 DOM主要由源自草的木质素衍生有机物质所占，但也包含被子植物衍生的木质素。在盐度为30时，富含腐殖质的DOM分解超过60％，所有HS组分均大大降低，而在另两个实验中，未检测到分解，HS组分仅发生微小变化。在盐度为30的实验中，HA组分的组成发生了显着变化，而FA和HPA组分的组成则发生了微小变化。主要酚类木质素衍生的有机化合物的酸与醛（Ad / Al）比表明天然HS的氧化程度很高。然而，在分解过程中，丁香基酚和香草基酚的Ad / Al比降低，因此表明这些木质素衍生的化合物的高度分解，即脱羧。结果表明，海洋细菌群落的分解是潮间带沿海地区陆地衍生的难治性DOM的重要汇。

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  • 来源
    《Marine Chemistry》 |2013年第20期|23-31|共9页
  • 作者

    Veljo Kisand; Sven Gebhardt; Juergen Rullkoetter; Meinhard Simon;

  • 作者单位

    Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, P.O. Box 2503. D-26111 Oldenburg, Germany,Institute of Technology, University of Tartu, Nooruse 1, Tartu EST-50411, Estonia;

    Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, P.O. Box 2503. D-26111 Oldenburg, Germany;

    Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, P.O. Box 2503. D-26111 Oldenburg, Germany;

    Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, P.O. Box 2503. D-26111 Oldenburg, Germany;

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  • 正文语种 eng
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  • 关键词

    DOM; humic substances; biodegradation; estuary; wadden sea; pyrolysis-GC/MS;

    机译：DOM;腐殖质;生物降解河口;瓦登海热解-GC / MS;

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