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Influence of global change on phytoplankton and nutrient cycling in the Elbe River

机译：全球变化对易北河浮游植物和养分循环的影响

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摘要

The effects of changing climatic and socio-economic conditions on the water quality of the Elbe River were investigated using the deterministic model QSim. Since the impact of global change on river water quality marks the endpoint of various processes in the catchment and in the atmosphere, this study was performed within a network of interacting models that determined input parameters for water quality simulations. The development of phytoplankton and nutrient concentrations under conditions of global change was modeled along a 700 km stretch of the river. The simulations revealed a strong, scale-dependent effect of climate change on phytoplankton biomass, leading to a longitudinal shift of the dominating processes (primary productivity vs. respiration) along the river continuum. Under reduced flow, combined with increasing temperature and global radiation, phytoplankton biomass increased and phytoplankton maxima shifted in upstream direction, followed by higher system respiration rates in the adjacent downstream sections. In contrast, higher flow shifted the phytoplankton maximum toward the downstream sections. Even a drastic reduction of phosphorus inputs from anthropogenic sources had only limited influence on algal biomass, due to the ability of algal cells to store phosphorus. A strong reduction in P-inputs especially in the headwaters would be necessary to counterbalance the possible climate-induced effects on algal biomass.
机译：使用确定性模型QSim研究了气候和社会经济条件的变化对易北河水质的影响。由于全球变化对河流水质的影响标志着流域和大气中各个过程的终点，因此本研究是在相互作用模型网络中进行的，该模型确定了水质模拟的输入参数。在全球变化的条件下，沿着这条河的700公里长段模拟了浮游植物和养分浓度的发展。模拟结果表明，气候变化对浮游植物生物量具有强烈的，规模依赖性的影响，从而导致沿河流连续体的主要过程（主要生产力与呼吸作用）的纵向变化。在流量减少的情况下，再加上温度升高和整体辐射增加，浮游植物的生物量增加，浮游植物的最大值向上游方向移动，随后在相邻的下游区域中，系统的呼吸速率增加。相反，较高的流量使浮游植物的最大值向下游移动。由于藻类细胞储存磷的能力，即使是人为来源的磷输入量的急剧减少也仅对藻类生物量产生有限的影响。为了抵消气候可能对藻类生物量产生的影响，有必要大力减少磷的投入，特别是在上游地区。

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  • 来源
    《Regional Environmental Change》 |2011年第2期|p.405-421|共17页
  • 作者

    Katrin Quiel; Annette Becker; Volker Kirchesch; Andreas Schol; Helmut Fischer;

  • 作者单位

    German Federal Institute of Hydrology,Am Mainzer Tor 1, 56068 Koblenz, Germany,Leibniz-Institute of Freshwater Ecology and Inland Fisheries,Miiggelseedamm 310, 12587 Berlin, Germany;

    German Federal Institute of Hydrology,Am Mainzer Tor 1, 56068 Koblenz, Germany;

    German Federal Institute of Hydrology,Am Mainzer Tor 1, 56068 Koblenz, Germany;

    German Federal Institute of Hydrology,Am Mainzer Tor 1, 56068 Koblenz, Germany;

    German Federal Institute of Hydrology,Am Mainzer Tor 1, 56068 Koblenz, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    elbe; river; water quality model; phytoplankton; nutrients; climate change;

    机译：易北河河;水质模型;浮游植物营养素气候变化;

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