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首页> 外文期刊>Aquatic Sciences >Bioavailability and radiocarbon age of fluvial dissolved organic matter (DOM) from a northern peatland-dominated catchment: effect of land-use change
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Bioavailability and radiocarbon age of fluvial dissolved organic matter (DOM) from a northern peatland-dominated catchment: effect of land-use change

机译：北部泥炭地为主的流域河流溶解性有机物的生物利用度和放射性碳年龄：土地利用变化的影响

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摘要

The radiocarbon age and biodegradability of dissolved organic matter (DOM) from a northern peat-dominated river system was studied and the effects of land-use were compared. Samples were obtained from streams and ditches comprising sub-catchments of the Kiiminki River, Northern Finland. Sample sites included areas of natural mire, areas subjected to moderate disturbance (ditching to enhance forestry), and areas subjected to serious land use change (agriculture and peat excavation). The study employed a 55 day bioassay that measured the biodegradation potential of surface-water DOM. We identified release of modern (mean 6-13 year old) DOM from natural sites, and material aged up to 1,553 years from disturbed sites. The proportion of biodegradable DOC ranged from 4.1 to 17.9 %, and bacterial DOC removal was modelled using twin-pool and reactivity-continuum (beta distribution) approaches. Bacterial growth efficiency ranged from 0.11 to 0.26 between areas of different land use, and these relatively low values reflect the humic-rich DOM released from boreal peatland. Despite the range of land-use types studied, including intensive peatland excavation areas, there was no detectable relationship between the biological lability of DOM and its radiocarbon age.
机译：研究了北部泥炭为主的河流系统的放射性碳年龄和可溶性有机物的可降解性，并比较了土地利用的影响。样品是从芬兰北部Kiiminki河子流域的溪流和沟渠中获得的。样本地点包括自然泥潭地区，遭受中度扰动的地区（开沟以加强林业）和土地利用发生严重变化的地区（农业和泥炭发掘）。该研究采用了为期55天的生物测定法，该测定法测量了地表水DOM的生物降解潜力。我们确定了从自然地点释放的现代（平均6-13岁）DOM，以及从受干扰地点释放了长达1553年的材料。可生物降解的DOC的比例在4.1％至17.9％之间，并且使用双池和连续反应（β分布）方法对细菌DOC的去除进行了建模。不同土地利用区域之间的细菌生长效率在0.11至0.26之间，这些相对较低的值反映了从北方泥炭地释放的富含腐殖质的DOM。尽管研究了多种土地利用类型，包括密集的泥炭地开挖区，但DOM的生物不稳定性与其放射性碳年龄之间没有可检测的关系。

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  • 来源
    《Aquatic Sciences》 |2014年第3期|393-404|共12页
  • 作者

    Chris J. Hulatt; Hermanni Kaartokallio; Eero Asmala; Riitta Autio; Colin A. Stedmon; Eloni Sonninen; Markku Oinonen; David N. Thomas;

  • 作者单位

    Finnish Environment Institute (SYKE), 00251 Helsinki, Finland;

    Finnish Environment Institute (SYKE), 00251 Helsinki, Finland;

    Finnish Environment Institute (SYKE), 00251 Helsinki, Finland;

    Finnish Environment Institute (SYKE), 00251 Helsinki, Finland;

    National Institute for Aquatic Resources, Technical University of Denmark, 2920 Charlottenlund, Denmark;

    Finnish Museum of Natural History, Laboratory of Chronology, University of Helsinki, 00014 Helsinki, Finland;

    Finnish Museum of Natural History, Laboratory of Chronology, University of Helsinki, 00014 Helsinki, Finland;

    Finnish Environment Institute (SYKE), 00251 Helsinki, Finland,School of Ocean Sciences, College of Natural Sciences, Bangor University, Menai Bridge LL59 5AB, UK,Arctic Research Centre, Aarhus University, Aarhus, Denmark;

  • 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

    Dissolved organic matter; Boreal; Radiocarbon; Peat; Biodegradation; Land use;

    机译：溶解的有机物;北方;放射性碳;泥炭;生物降解;土地利用;

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