Macrophytes are important organisms in running water systems, having a decisive role in ecological processes and interactions. Their temporal and spatial distribution in streams can be highly variable, and this is often determined by flow velocity. In this study, macrophyte growth, morphology and nutrient stoichiometry were studied monthly during one growing season in reaches with different flow velocity and flow velocity distribution and, as a result, different distributional plant patterns in an Austrian lowland stream, dominated by evergreen macrophyte species, Berula erecta. Flow velocity, water depth, fine sediment layer depth and metabolism were measured in the stream and the correlation with plant biomass and morphological traits was tested. We aimed to study differences between reaches with different distributional plant patterns and whether common interactions between macrophytes and flow velocity can also be observed when vegetation is evergreen. Plant biomass showed seasonal variation, with the highest values in June and the lowest in February. In the reach with low flow velocity and homogeneous macrophyte distribution, biomass peaked in summer and plant morphology changed with the seasons, whereas biomass and morphology in the reach with high flow velocity and patchy distribution were more constant throughout the year. Plant carbon, nitrogen and phosphorus content were higher in spring and autumn than in summer, whereas biogenic silica accumulated over the course of the growth season. Stream metabolism was strongly correlated with macrophyte biomass, and this correlation was stronger in the reach with homogeneous macrophyte distribution than in the reach with a patchy distribution. Moreover, average leaf area and stem length were positively correlated with fine sediment layer depth, and negatively with flow velocity. The results stress the importance of macrophyte growth and morphology in river processes like metabolism, hydromorphology and nutrient dynamics: especially plant morphology plays an important role in macrophyte–flow interactions.

中文翻译：

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地下水灌溉河流中大型植物性状的环境控制及其与代谢和水形态的相互作用

大型植物是自来水系统中的重要生物，在生态过程和相互作用中起决定性作用。它们在河流中的时间和空间分布可能高度可变，这通常取决于流速。在这项研究中，每月对一个生长季节中具有不同流速和流速分布的河段中大型植物的生长，形态和养分化学计量进行研究，结果，奥地利低地溪流中的植物分布模式不同，以常绿大型植物为主导，直。测量溪流中的流速，水深，细沙层深度和新陈代谢，并测试与植物生物量和形态性状的相关性。我们旨在研究具有不同分布植物格局的河段之间的差异，以及当植被为常绿植物时是否还可以观察到大型植物与流速之间的共同相互作用。植物生物量呈现季节性变化，6月最高，2月最低。在低流速和均质植物分布均匀的河段中，生物量在夏季达到峰值，植物形态随季节而变化，而在高流速和斑片状分布的河段中，生物量和形态全年都较恒定。植物碳 春季和秋季的氮和磷含量高于夏季，而生物硅在整个生长季节中积累。溪流代谢与大型植物生物量密切相关，在均匀大型植物分布范围内，这种相关性强于斑块状分布。此外，平均叶面积和茎长与细沙层深度呈正相关，与流速呈负相关。结果强调了大型植物的生长和形态在诸如代谢，水形态和养分动力学等河流过程中的重要性：特别是植物形态在大型植物与水流的相互作用中起着重要的作用。溪流代谢与大型植物生物量密切相关，在均匀大型植物分布范围内，这种相关性强于斑块状分布。此外，平均叶面积和茎长与细沙层深度呈正相关，与流速呈负相关。结果强调了大型植物的生长和形态在诸如代谢，水形态和养分动力学等河流过程中的重要性：特别是植物形态在大型植物与水流的相互作用中起着重要的作用。溪流代谢与大型植物生物量密切相关，在均匀大型植物分布范围内，这种相关性强于斑块状分布。此外，平均叶面积和茎长与细沙层深度呈正相关，与流速呈负相关。结果强调了大型植物的生长和形态在诸如代谢，水形态和养分动力学等河流过程中的重要性：特别是植物形态在大型植物与水流的相互作用中起着重要的作用。