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Impact of grazing management on silica export dynamics of Wadden Sea saltmarshes

机译：放牧管理对瓦登海盐沼二氧化硅出口动态的影响

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摘要

During periods of silica limitation, its supply from tidal marshes is important for the stability of estuarine and coastal food webs. Saltmarshes are highly dynamic, grass dominated ecosystems: their large area, high salinity and location imply that they could efficiently contribute to the buffering of silica depletion events in the coastal zone. As grazing management potentially alters vegetation and sedimentation dynamics in saltmarshes, it could have an indirect impact on silica cycling in these systems. In two saltmarshes of the Wadden Sea coast, concentrations of dissolved and biogenic silica (DSi and BSi) were measured in eight creeks in four seasons under different management conditions. Export rates were calculated using simultaneous discharge measurements. Mean annual DSi concentration in the seepage water was 338 ± 112 μmol l~(-1). Ungrazed sites had significantly higher seepage water DSi concentrations than sites which were grazed by sheep. BSi concentrations were, in general, lower and more variable. DSi export rates from ungrazed sites (265 ± 155 μmol m~(-2) day~(-1)) were twice as high as from grazed saltmarshes (126 ± 137 μmol m~(-2) day~(-1)). DSi concentrations were among the highest values previously reported for saltmarshes and tidal freshwater marshes. Although differences in silica exports from grazed and ungrazed sites might be partly explained by silica uptake of benthic diatoms in the creeks, differences in hydrology appeared to be an overarching factor, controlling silica exports from Wadden Sea saltmarshes.
机译：在二氧化硅限制时期，潮汐沼泽提供的二氧化硅对于河口和沿海食物网的稳定性很重要。盐沼是高度动态的，以草为主的生态系统：它们的大面积，高盐度和位置暗示它们可以有效地缓冲沿海地区的二氧化硅耗竭事件。由于放牧管理可能改变盐沼中的植被和沉积动力学，因此可能间接影响这些系统中的二氧化硅循环。在瓦登海沿岸的两个盐沼中，在不同管理条件下，在四个季节的八个小溪中测量了溶解态二氧化硅和生物二氧化硅（DSi和BSi）的浓度。出口率是通过同时排放量计算得出的。渗流水中的年平均DSi浓度为338±112μmoll〜（-1）。未放牧的地点的渗漏水DSi浓度明显高于绵羊放牧的地点。通常，BSi浓度较低且变化较大。未脱脂部位的DSi出口速率（265±155μmolm〜（-2）天〜（-1））是放牧盐沼的126i 137μmolm〜（-2）天〜（-1）高两倍。 。 DSi浓度是先前报道的盐沼和潮汐淡水沼泽的最高值之​​一。尽管从放牧和未湿润地区的二氧化硅出口差异可能部分由小溪中底栖硅藻对二氧化硅的吸收来解释，但水文学差异似乎是一个主要因素，控制了瓦登海盐沼的二氧化硅出口。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第20期|1-11|共11页
  • 作者

    F. Muller; E. Struyf; J. Hartmann; A. Weiss; K. Jensen;

  • 作者单位

    Applied Plant Ecology, Department of Biology, University of Hamburg, Ohnhorststr, 18, 22609 Hamburg, Germany;

    Ecosystem Management Research Croup, Department of Biology, University of Antwerp, Universiteitsplein 1C, 2610 Wilrijk, Belgium;

    Chemistry of Natural Aqueous Solutions, Institute for Geology, KlimaCampus, University of Hamburg, Bundesstr. 55, 20146 Hamburg, Germany;

    Chemistry of Natural Aqueous Solutions, Institute for Geology, KlimaCampus, University of Hamburg, Bundesstr. 55, 20146 Hamburg, Germany;

    Applied Plant Ecology, Department of Biology, University of Hamburg, Ohnhorststr, 18, 22609 Hamburg, Germany;

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  • 正文语种 eng
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  • 关键词

    silica cycling; dissolved silica; biogenic silica; benthic diatoms; land use; Elymus athericus;

    机译：二氧化硅循环;溶解二氧化硅生物硅底栖硅藻土地利用;斑马草;

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