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首页> 外文期刊>Aquatic Sciences >Contraction, fragmentation and expansion dynamics determine nutrient availability in a Mediterranean forest stream
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Contraction, fragmentation and expansion dynamics determine nutrient availability in a Mediterranean forest stream

机译：收缩，破碎和扩张动态决定了地中海森林溪流中的养分供应

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摘要

Temporary streams are a dominant surface water type in the Mediterranean region. As a consequence of their hydrologic regime, these ecosystems contract and fragment as they dry, and expand after rewetting. Global change leads to a rapid increase in the extent of temporary streams, and more and more permanent streams are turning temporary. Consequently, there is an urgent need to better understand the effects of flow intermittency on the bio-geochemistry and ecology of stream ecosystems. Our aim was to investigate how stream nutrient availability varied in relation to ecosystem contraction, fragmentation and expansion due to hydrologic drying and rewetting. We quantified the temporal and spatial changes in dissolved nitrogen (N) and phosphorus (P) concentrations along a reach of a temporary Mediterranean forest stream during an entire contraction-fragmentation-expansion hydrologic cycle. We observed marked temporal changes in N and P concentrations, in the proportion of organic and inorganic forms as well as in stoichiometric ratios, reflecting shifts in the relative importance of in-stream nutrient processing and external nutrient sources. In addition, the spatial heterogeneity of N and P concentrations and their ratios increased substantially with ecosystem fragmentation, reflecting the high relevance of in-stream processes when advective transport was lost. Overall, changes were more pronounced for N than for P. This study emphasizes the significance of flow intermittency in regulating stream nutrient availability and its implications for temporary stream management. Moreover, our results point to potential biogeochemical responses of these ecosystems in more temperate regions under future water scarcity scenarios.
机译：在地中海地区，临时水流是主要的地表水类型。由于其水文状况，这些生态系统在干燥时会收缩并破碎，并在重新润湿后扩展。全球变化导致临时数据流的范围迅速增加，越来越多的永久数据流变为临时数据流。因此，迫切需要更好地了解流动间歇性对河流生态系统生物地球化学和生态学的影响。我们的目的是研究由于水文干燥和再润湿而导致的溪流养分利用率与生态系统的收缩，破碎和扩张有关。我们量化了在整个收缩-碎片-膨胀-扩展水文循环过程中，沿临时地中海森林流到达的溶解氮（N）和磷（P）浓度的时空变化。我们观察到氮和磷浓度，有机和无机形式的比例以及化学计量比的时间变化显着，反映了流内养分加工和外部养分来源的相对重要性发生了变化。此外，氮和磷的浓度及其比例的空间异质性随着生态系统的破碎而大大增加，这反映了失去对流运输时河内过程的高度相关性。总体而言，氮的变化比磷的变化更为明显。本研究强调流量间歇性在调节河流养分有效性方面的重要性及其对河流临时管理的影响。此外，我们的结果表明，在未来的水资源短缺情况下，这些生态系统在较温带地区的潜在生物地球化学响应。

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  • 来源
    《Aquatic Sciences》 |2011年第4期|p.485-497|共13页
  • 作者

    D. von Schiller; K. Tockner; V. Acufia; S. Sabater; X. Timoner; D. Graeber; E. Marti; M. Ribot; S. Sabater; X. Timoner;

  • 作者单位

    Leibniz-Institute of Freshwater Ecology and Inland Fisheries,Miiggelseedamm 301, 12587 Berlin, Germany;

    Leibniz-Institute of Freshwater Ecology and Inland Fisheries,Miiggelseedamm 301, 12587 Berlin, Germany;

    Catalan Institute for Water Research,Emili Grahit 101, 17003 Girona, Spain;

    Catalan Institute for Water Research,Emili Grahit 101, 17003 Girona, Spain;

    Catalan Institute for Water Research,Emili Grahit 101, 17003 Girona, Spain;

    Department of Freshwater Ecology, National Environmental Research Institute, Vejls0vej 25, Silkeborg 8600, Denmark;

    Biogeodynamics and Biodiversity Group, Centre for Advanced Studies of Blanes, CSIC, Acces a la Cala St. Francesc 14, 17300 Blanes, Spain;

    Biogeodynamics and Biodiversity Group, Centre for Advanced Studies of Blanes, CSIC, Acces a la Cala St. Francesc 14, 17300 Blanes, Spain;

    Institute of Aquatic Ecology, University of Girona, 17071 Girona, Spain;

    Institute of Aquatic Ecology, University of Girona, 17071 Girona, Spain;

  • 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

    temporary streams; flow intermittency; drought; nitrogen; phosphorus; spatial heterogeneity;

    机译：临时水流间歇性干旱氮磷空间异质性;

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