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

被引:0
作者
Katrin Quiel
Annette Becker
Volker Kirchesch
Andreas Schöl
Helmut Fischer
机构
[1] German Federal Institute of Hydrology,
[2] Leibniz-Institute of Freshwater Ecology and Inland Fisheries,undefined
来源
Regional Environmental Change | 2011年 / 11卷
关键词
Elbe; River; Water quality model; Phytoplankton; Nutrients; Climate change;
D O I
暂无
中图分类号
学科分类号
摘要
The effects of changing climatic and socioeconomic 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.
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页码:405 / 421
页数:16
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