PDF(Pubmed)
Abstract：
The study covered a small, shallow lake, intensively used for recreation (sailing, tourist services and port infrastructure). This study aimed to determine the spatial differentiation of bottom sediments and the potential for phosphorus release in five zones, differing mainly in the type of recreation, depth, direct catchment management, shoreline management and macrophyte presence. The results were used to propose protective and restoration measures to improve the water quality of the studied lake. The innovation in the study was the detailed analysis of bottom sediments, which can be a significant source of pollution besides the external load from the catchment and tourist pressure, in the planned management of this ecosystem. Examination of the physicochemical properties of the bottom sediments showed a clear variation in both composition and potential for internal phosphorus loading. The sediments from the profundal zone, where the most boating activity was observed, together with the sediments from the shallow zone where the boats dock (mooring zone), had the highest potential to supply phosphorus to the bottom waters. This fact was demonstrated by the highest total phosphorus (TP) concentrations in sediments (up to 1.32 mgPg-1 DW) and the content of the most mobile fractions (up to 33%). The other zones associated with the marina, fuel zone, tributary and canal were not significant sources of phosphorus to the ecosystem. Based on the above results, a restoration method involving the removal of bottom sediments from the bottom zone was proposed, supported, of course, by protective measures in the catchment (maintaining a buffer zone around the lake and limiting the inflow of pollutants with tributary waters). The proposed measures with sustainable tourist pressure should improve water quality and thus contribute to protecting this valuable natural landscape.
摘要：
这项研究涵盖了一个小的，浅湖,密集用于娱乐(帆船，旅游服务和港口基础设施)。这项研究旨在确定底部沉积物的空间分异和五个区域中磷的释放潜力。主要在娱乐类型上有所不同，深度,直接集水管理，海岸线管理和大型植物的存在。研究结果用于提出保护和修复措施，以改善研究湖泊的水质。该研究的创新点是对底部沉积物的详细分析，除了来自流域和游客压力的外部负荷之外，这可能是一个重要的污染源，在这个生态系统的计划管理中。对底部沉积物的理化性质的检查显示，内部磷负荷的组成和潜力均有明显变化。深落带的沉积物，观察到最多的划船活动，连同船只停靠的浅层区域(系泊区)的沉积物，向底层水域提供磷的潜力最大。沉积物中最高的总磷（TP）浓度（高达1.32mgPg-1DW）和流动性最强的馏分含量（高达33％）证明了这一事实。与码头相关的其他区域，燃料区,支流和运河不是生态系统的重要磷来源。基于以上结果,提出了一种从底部区域去除底部沉积物的修复方法，支持,当然,通过在集水区采取保护措施（维持湖泊周围的缓冲区并限制支流水域的污染物流入）。具有可持续旅游压力的拟议措施应改善水质，从而有助于保护这一宝贵的自然景观。
