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首页> 外文期刊>Estuarine Coastal and Shelf Science >Ungrazed salt marsh has well connected soil pores and less dense sediment compared with grazed salt marsh: a CT scanning study
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Ungrazed salt marsh has well connected soil pores and less dense sediment compared with grazed salt marsh: a CT scanning study

机译：与吃草盐沼相比，未加工的盐沼具有良好的连接土壤毛孔和较少的沉积物：CT扫描研究

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摘要

Salt marshes provide various ecosystem functions and services including flooding protection, wildlife habitats, and carbon storage. These functions and services could, however, be strongly impacted by anthropogenic activities such as livestock grazing - a common practice in the Wadden Sea salt marshes located in North west of Europe. To assess the impact of grazing on soil parameters, a total number of eight soil cores (circle divide: 18 cm; L: 50 cm) were collected in areas with and without livestock grazing, and scanned using a Computed Tomography (CT) to characterize soil parameters including soil macroporosity, sediment density, and pores connectivity. Subsequently, sub-samples were taken for determination of soil moisture content (%) and bulk density (g cm(-3)). To account for the impact of grazing on soil drainage after tidal inundations, water table relative to soil surface was monitored during two flooding events. Our results demonstrated that grazed salt marsh has higher top-soil bulk density, and lower macroporosity and pore connectivity, than ungrazed marsh, due to soil compaction by livestock grazing. Moreover, grazed marsh has slower water drainage and that might keep the soil waterlogged for a longer period of time which has implications on lowering decomposition rate due to lower soil redox. This study provides evidence that grazing alters physical soil parameters in salt marsh. Consequently, grazing needs to be accounted for when evaluating how land use impacts ecosystem services and functions including carbon sequestration.
机译：盐沼提供各种生态系统功能和服务，包括洪水保护，野生动物栖息地和碳储存。然而，这些职能和服务可能受到牲畜放牧等人为活动的强烈影响 - 位于欧洲西北部的Wadden海盐沼的常见做法。为了评估放牧对土壤参数的影响，在有牲畜放牧的区域收集了八个土壤核心（圆形分割：18厘米; L：50cm），并使用计算机断层扫描（CT）来表征扫描土壤参数，包括土壤宏观度，沉积物密度和孔隙连接。随后，采取亚样品用于测定土壤水分含量（％）和堆积密度（G cm（-3））。为了考虑在潮汐淹没后放牧对土壤排水的影响，在两次洪水事件中监测了水位相对于土壤表面的水位。我们的结果表明，由于牲畜放牧的土壤压实，所吃的盐沼具有较高的土壤堆积密度，较低的土壤堆积密度和较低的大孔隙度和孔隙连接，而不是未加工的沼泽。此外，放牧的沼泽具有较慢的排水，可能使土壤保持较长的时间较长的时间，这对由于较低的土壤氧化还原引起的分解率降低了。本研究提供了放牧在盐沼中的改变物理土壤参数的证据。因此，需要考虑在评估土地利用影响生态系统服务和碳封存时的功能时进行放牧。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2020年第30期|106987.1-106987.12|共12页
  • 作者

    Keshta Amr; Koop-Jakobsen Ketil; Titschack Juergen; Mueller Peter; Jensen Kai; Baldwin Andrew; Nolte Stefanie;

  • 作者单位

    Tanta Univ Coll Sci Bot Dept Tanta 31512 Egypt|Univ Maryland Dept Environm Sci & Technol College Pk MD 20742 USA;

    Alfred Wegener Inst Helmholtz Ctr Polar & Marine Res Wadden Sea Stn Sylt Hafenstr 43 D-25992 List Auf Sylt Sylt Germany|Univ Bremen MARUM Ctr Marine Environm Sci D-28359 Bremen Germany;

    Univ Bremen MARUM Ctr Marine Environm Sci D-28359 Bremen Germany|Marine Res Dept Senckenberg Meer D-26382 Wilhelmshaven Germany;

    Smithsonian Environm Res Ctr 647 Contees Wharf Rd Edgewater MD 21037 USA|Univ Hamburg Inst Plant Sci & Microbiol Appl Plant Ecol D-22609 Hamburg Germany;

    Univ Hamburg Inst Plant Sci & Microbiol Appl Plant Ecol D-22609 Hamburg Germany;

    Univ Maryland Dept Environm Sci & Technol College Pk MD 20742 USA;

    Univ East Anglia Sch Environm Sci Norwich Res Pk Norwich NR4 7TJ Norfolk England|Ctr Environm Fisheries & Aquaculture Sci Pakefield Rd Lowestoft Suffolk England;

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  • 正文语种 eng
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  • 关键词

    Livestock; Land-use managment; Soil ecosystem services; Wadden sea; Computed tomography; Soil macroporosity;

    机译：牲畜;土地使用管理;土壤生态系统服务;瓦登海;计算断层扫描;土壤巨孔;

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