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Processing of humic-rich riverine dissolved organic matter by estuarine bacteria: effects of predegradation and inorganic nutrients

机译：河口细菌处理富含腐殖质的河边溶解有机物：预降解和无机养分的影响

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摘要

The bioavailability of predegraded dissolved organic matter (DOM) from a humic-rich, boreal river to estuarine bacteria from the Baltic Sea was studied in 39-day bioassays. The river waters had been exposed to various degrees of bacterial degradation by storing them between 0 and 465 days in dark prior to the bioassay. The resulting predegraded DOM was inoculated with estuarine bacteria and the subsequent changes in DOM quantity and quality measured. During the incubations, dissolved organic carbon (DOC) and oxygen concentrations decreased, indicating heterotrophic activity. Coloured DOM was degraded less than DOC, indicating a selective utilization of DOM, and humic-like fluorescence components increased during the incubations. The amount of DOC degraded was not affected by the length of DOM predegradation. The percentage of bioavailable DOC (%BDOC) was higher in experiment units with added inorganic nitrogen and phosphorus than without addition (on average 13.5 % and 9.0, respectively), but had no effect on the degradation of fresh, non-predegraded, DOC (%BD0C 12.0 %). Bacterial growth efficiency (BGE) was highest (65 ± 2 %) in the units with fresh DOM, and lowest in units with predegraded DOM and no added inorganic nutrients (11 ± 4 %). The addition of inorganic nutrients increased the BGE of predegraded DOM units by an average of 28 ± 4 %. There was no significant effect on BGE by length of predegradation after the initial drop (＜3 months). This study suggests that both the length of predegradation and the inorganic nutrient status in the receiving estuary has consequences to carbon cycling and will determine the amount of terrestrial-derived DOC being ultimately assimilated into marine food webs.
机译：在为期39天的生物测定中，研究了腐殖质丰富的北方河中预降解的溶解有机物（DOM）对波罗的海河口细菌的生物利用度。通过在生物测定之前将其储存在黑暗中0到465天之间，使河水暴露于各种程度的细菌降解。将产生的预先降解的DOM接种入河口细菌，然后测量DOM数量和质量的后续变化。在孵育过程中，溶解的有机碳（DOC）和氧浓度降低，表明异养活性。有色DOM降解程度低于DOC，表明对DOM的选择性利用，并且在培养过程中腐殖质样荧光成分增加。 DOC的降解量不受DOM预降解时间的影响。添加了无机氮和磷的实验单位的生物利用度DOC（％BDOC）的百分比高于未添加无机氮和磷的实验单位（分别为平均13.5％和9.0），但对新鲜的未降解DOC的降解没有影响（ ％BD0C 12.0％）。细菌生长效率（BGE）在新鲜DOM单元中最高（65±2％），在预先降解DOM和未添加无机营养素的单元中最低（11±4％）。添加无机养分可使预降解DOM单位的BGE平均增加28±4％。初始下降（＜3个月）后的预降解时间对BGE没有显着影响。这项研究表明，接收河口的预降解时间长短和无机养分状况都会对碳循环产生影响，并将决定最终被陆生同化进入海洋食物网的陆生DOC的数量。

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  • 来源
    《Aquatic Sciences》 |2014年第3期|451-463|共13页
  • 作者

    E. Asmala; R. Autio; H. Kaartokallio; C. A. Stedmon; D. N. Thomas;

  • 作者单位

    Marine Research Centre, Finnish Environment Institute (SYKE), Helsinki, Finland,Department of Bioscience, Aarhus University, Roskilde, Denmark;

    Marine Research Centre, Finnish Environment Institute (SYKE), Helsinki, Finland;

    Marine Research Centre, Finnish Environment Institute (SYKE), Helsinki, Finland;

    National Institute for Aquatic Resources, Section for Oceanography and Climate, Technical University of Denmark, Charlottenlund, Denmark;

    Marine Research Centre, Finnish Environment Institute (SYKE), Helsinki, Finland,School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey, UK;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    DOM; Bacterial growth efficiency; Predegradation; Carbon cycling; CDOM; Fluorescent DOM;

    机译：DOM;细菌生长效率;预降解;碳循环;CDOM;荧光DOM;

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