Effects of macrophyte development on the oxygen metabolism of an urban river rehabilitation structure.
Effects of macrophyte development on the oxygen metabolism of an urban river rehabilitation structure.
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DOI：
10.1016/j.scitotenv.2016.08.174
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
T. Sukhodolova;A. Weber;Jingxin Zhang;C. Wolter
中科院分区：
文献类型：
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作者：
T. Sukhodolova;A. Weber;Jingxin Zhang;C. Wolter
为了弥补航道扩大和航运活动的水力影响，2004年在城市通航的施普雷河上建造了一个人工修复结构。这种受波浪保护的浅海岸带被证明在减少船舶引起的波浪方面非常有效，并为水生植物的发展提供了适宜的条件。然而，随着时间的推移，由于夏末的缺氧条件，它变得不太适合其他水生生物。本研究的目的是对比计算和分析修复结构与主通道在2009年建成5年后的氧平衡。在恢复结构中，植被密度峰值的生产呼吸比在0.10 ~ 0.34之间，而在恢复结构前的主河道中，生产呼吸比在0.67 ~ 0.86之间。茂密的植被限制了水分的交换，造成了氧气的消耗。因此，通过水面和长期水位变化的大气氧气输入成为修复结构中最重要的氧气供应过程。增加供氧以改善修复结构对其他水生类群的适宜性需要增加与主通道的水交换，例如通过自适应地增加横向连通性。
To compensate for fairway enlargements and the hydraulic impacts of navigation activity, an artificial rehabilitation structure was constructed in the urban, navigable River Spree in 2004. This wave-protected, shallow littoral zone proved to be highly effective in reducing vessel-induced waves and provided suitable conditions for the development of aquatic plants. However, in time it became less suitable for other aquatic organisms due to hypoxic conditions in late summer. This study aimed to comparatively calculate and analyze the oxygen balance of the rehabilitation structure and the main channel five years after the construction in 2009.In the rehabilitation structure, the production to respiration ratio ranged between 0.10 and 0.34 at the peak of vegetation density, while in the main channel in front of the rehabilitation structure it ranged between 0.67 and 0.86. Dense vegetation limited the water exchange and caused oxygen depletion. Thus, atmospheric oxygen input through the water surface and due to long-term water level changes became the most important supply processes for oxygen in the rehabilitation structure.Enhancing the oxygen supply to improve the suitability of the rehabilitation structure for other aquatic taxa requires an increase in water exchange with the main channel, e.g. by adaptively increasing the lateral connectivity.