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首页> 外文期刊>Aquatic Sciences >Export and degassing of terrestrial carbon through watercourses draining a temperate podzolized catchment
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Export and degassing of terrestrial carbon through watercourses draining a temperate podzolized catchment

机译：通过将温带荚果化集水区排干的水道对陆地碳进行出口和脱气

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摘要

We measured spatial and temporal variations in carbon concentrations, isotopic compositions and exports during a complete hydrological cycle in nine watercourses draining a lowland forested podzolized catchment, flowing into the Arcachon lagoon (France). In addition, integrated fluxes of CO_2 across the water-atmosphere interface were estimated to assess the relative importance of CO_2 evasion versus lateral carbon transport at the catchment scale. Watercourse similarities and specificities linked to the local catchment characteristics are discussed and compared with other riverine systems. Low concentrations of suspended particulate matter and particulate organic carbon (POC) were generally measured in all the watercourses (8.4 ±3.4 and 1.6 ± 0.6 mg L~(-1) respectively), reflecting limited mechanical soil erosion. The generally high POC content in the suspended matter (20 %), low Chl a concentrations (1.3 ± 1.4 μg L~(-1)) and the relatively constant δ~13C-POC value (near -28 %o) throughout the year reveal this POC originates from terrestrial C_3 plant and soil detritus. The presence of podzols leads to high levels of dissolved organic carbon (DOC; 6.6 ± 2.2 mg L~(-1)). Similarly, high dissolved inorganic carbon (DIC) concentrations were measured in the Arcachon lagoon catchment (5.9 ± 2.2 mg L~(-1)). The δ~13C-DIC value around —20 %o throughout the year in many small watercourses reveals the predominance of terrestrial carbon mineralisation and silicate rock weathering in soils as the major DIC source. With pCO_2 between 1,000 and 10,000 ppmv, all watercourses were a source of CO_2 to the atmosphere, particularly during the low river stage. Organic carbon parameters remained relatively stable throughout the year, whereas DIC parameters showed strong seasonal contrasts closely linked to the hydrological regime and hyporheic flows. In total, the carbon export from the Arcachon watershed was estimated at 15,870 t C year~' or 6 t C km~(-2) year~(-1), mostly exported to the lagoon as DOC (35 %), DIC (24 %) and lost as CO_2 degassing to the atmosphere (34 %).
机译：我们测量了在一个完整的水文循环中，九个水道的碳浓度，同位素组成和出口量的时空变化，这些水道排泄了低地森林荚果化流域，流入阿尔卡雄泻湖（法国）。此外，估计了跨水-大气界面的CO_2积分通量，以评估在集水规模上CO_2逃逸与横向碳迁移的相对重要性。讨论了与当地流域特征相关的河道相似性和特殊性，并将其与其他河流系统进行了比较。通常在所有水道中均测得低浓度的悬浮颗粒物和颗粒有机碳（分别为8.4±3.4和1.6±0.6 mg L〜（-1）），反映出有限的机械土壤侵蚀。全年悬浮物中的POC含量通常较高（20％），Chl a浓度较低（1.3±1.4μgL〜（-1））和全年相对恒定的δ〜13C-POC值（-28％o附近）揭示了此POC起源于陆地C_3植物和土壤碎屑。 pod唑的存在导致高水平的溶解有机碳（DOC； 6.6±2.2 mg L〜（-1））。同样，在阿尔卡雄泻湖集水区也测出了高溶解无机碳（DIC）浓度（5.9±2.2 mg L〜（-1））。在许多小河道中，全年的δ〜13C-DIC值约为-20％o，这表明土壤中碳的主要矿化作用和硅酸盐岩风化是DIC的主要来源。在pCO_2为1,000至10,000 ppmv的情况下，所有水道都是大气中CO_2的来源，尤其是在低河段时期。全年有机碳参数保持相对稳定，而DIC参数显示出强烈的季节性差异，与水文状况和水流减少密切相关。总的来说，阿卡雄流域的碳出口量估计为15,870 t C年〜或6 t C km〜（-2）年〜（-1），主要以DOC（35％），DIC（ 24％），并因向大气中的CO_2脱气而损失（34％）。

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  • 来源
    《Aquatic Sciences》 |2013年第2期|299-319|共21页
  • 作者

    Pierre Polsenaere; Nicolas Savoye; Henri Etcheber; Mathieu Canton; Dominique Poirier; Steven Bouillon; Gwenael Abril;

  • 作者单位

    Laboratoire Environnements et Paleoenvironnements Oceaniques et Continentaux (EPOC), Universite Bordeaux 1,CNRS-UMR 5805, Avenue des Facultes, 33405 Talence, France,Ecosystem Studies Department, Royal Netherlands Institute for Sea Research (NIOZ Yerseke), Korringaweg 7,4401 NT Yerseke, The Netherlands;

    Laboratoire Environnements et Paleoenvironnements Oceaniques et Continentaux (EPOC), Universite Bordeaux 1,CNRS-UMR 5805, Avenue des Facultes, 33405 Talence, France;

    Laboratoire Environnements et Paleoenvironnements Oceaniques et Continentaux (EPOC), Universite Bordeaux 1,CNRS-UMR 5805, Avenue des Facultes, 33405 Talence, France;

    Laboratoire Environnements et Paleoenvironnements Oceaniques et Continentaux (EPOC), Universite Bordeaux 1,CNRS-UMR 5805, Avenue des Facultes, 33405 Talence, France;

    Laboratoire Environnements et Paleoenvironnements Oceaniques et Continentaux (EPOC), Universite Bordeaux 1,CNRS-UMR 5805, Avenue des Facultes, 33405 Talence, France;

    Department of Earth and Environmental Sciences,Katholieke Universiteit Leuven, Leuven, Belgium;

    Laboratoire Environnements et Paleoenvironnements Oceaniques et Continentaux (EPOC), Universite Bordeaux 1,CNRS-UMR 5805, Avenue des Facultes, 33405 Talence, France;

  • 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

    podzolized catchment; coastal lagoon; carbon dynamics; carbon export; co_2 degassing;

    机译：装满水的集水区;沿海泻湖碳动力学碳出口;co_2脱气;

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