Report: “WRRL: Assessment of macrophytes and angiosperms (2009)”

» This thesis deals with the recording and evaluation of macrophytes/angiosperms (here: Röhrichte, Brack- and Salzmarschen) as part of a practical test for the implementation of the EC-WRRL in the transitional waters of Weser and Ems. The aim was to implement and test the procedures developed for the assessment of the macrophytes of the transitional waters, for the transition waters of Ems and Weser, by analysing all available and newly collected data and to adapt them to the water-specific conditions in the respective transitional waters. Based on this, an up-to-date assessment of the status of the above-mentioned quality elements was carried out for the quality component macrophytes/angiosperms in the transitional waters. As the transition waters of Weser and Ems are classified as significantly altered water bodies (HMWB), the ecological potential is also determined. Thus, the evaluation of the individual processed parameters yielded different results with regard to the classification of the ecological status or ecological potential. While individual parameters yielded good or even very good condition and good or very good ecological potential, others showed poor ecological status or poor ecological potential. Overall, the Weser and Ems transitional waters show a moderate ecological status or moderate ecological potential. The parameter “types and structure of the pioneer zone or the reed light belt” did not flow into the overall assessment in the sub-areas of Ems-Estuary and Outer Weser. However, the evaluation results there for this parameter indicate that there are significant ecological deficits in the area of the pioneer zone in these water sections. Indications of further work and recommendations for the implementation of future monitoring will be provided.”本论文围绕威悉河与埃姆斯河过渡性水域（transitional waters）内大型水生植物（macrophytes）/被子植物（angiosperms，本文特指Röhrichte、咸淡水沼泽与盐沼）的记录与评估展开，作为欧洲共同体水框架指令（EC-WRRL）落地实践测试的一部分。本研究的核心目标为：整合分析现有与新采集的全部数据，针对威悉河与埃姆斯河的过渡性水域，落地并验证此前开发的过渡性水域大型水生植物评估流程，并结合各过渡水域的水文特性对流程进行适配调整。基于上述工作，针对过渡性水域的大型水生植物/被子植物这一质量要素，对前述质量要素的现状开展了最新评估。鉴于威悉河与埃姆斯河的过渡性水域被归类为重度改变水体（Heavily Modified Water Bodies, HMWB），本研究同时确定了其生态潜力。由此，针对各项处理后参数的评估，在生态现状或生态潜力的分类层面呈现出差异化结果：部分参数对应的水体状态为良好乃至极佳，生态潜力亦处于良好或极佳水平；而另有部分参数则反映出较差的生态现状与生态潜力。整体而言，威悉河与埃姆斯河的过渡性水域生态现状与生态潜力均处于中等水平。在埃姆斯河口与外威悉河子区域中，"先锋带或芦苇透光带的类型与结构"这一参数未被纳入整体评估体系。但该参数在上述区域的评估结果显示，这些水域的先锋带区域存在显著的生态缺陷。本研究将给出后续研究方向与未来监测工作实施的相关建议。