Tidal flat development trial utilizing dredged sludge and aquatic weeds in an eutrophic closed water system.

这项研究试图通过在冈山县南部的小岛湖利用疏浚的污泥在人工潮滩上发展水草群落来创造生物栖息地和减少水污染，那里的营养物质浓缩已经取得了进展。把握影响滩涂的物理化学因素的变化，预测滩涂生物、水系和底泥之间的物质平衡。我们建议继续运营和维护生物群落。所获得的结果如下所述。滩涂发育地生态系统形成与发展的基础研究：对自然状态下种植树种群落发展的调查结果表明，在滩涂发育的土地上，宽叶、短叶、香椿群落发育，形成了植被护岸。此外，植物群落越大，居住在那里的贝类就越多。将沉水植物种植在多孔陶瓷中，形成了一种发光…。更多的蚂蚁方法。滩涂发育地理化因子形成过程的掌握：无论是表层还是地下5 cm以下，滨水区淡水侧土壤的电导率和pH值均高于大陆地区。虽然泥沙和局部冲刷是根据台风的有无而产生的，但植物群落地下部分的发展对此有很大的贡献。小岛湖农田入湖污染负荷调查：农田虽有氮素减量作用，但随施肥量和降水量的增加，向外的磷负荷有增加的趋势。小岛湖水生杂草分布与水污染调查：虽然每年都会发生大量的菱角，但没有发现沉水植物重新生长的迹象。在水质方面，没有发现磷的减少趋势。通过数据处理对滩涂开发地进行模型分析：对小岛湖人工滩涂周围产生的水流进行了定量分析。如上所述，通过在人工滩涂种植大型水生杂草，证实了按食物链建立的生态系统、有机物的积累和水质的净化。然而，基于这些结果，提出一种操作和维护生物群落的方法还为时过早。较少

This study attempts creation of a biotope and reduction in water pollution by developing aquatic weed community in an artificial tidal flat using dredged sludge in Lake Kojima located in southern Okayama Prefecture, where nutrient enrichment has advanced. Changes in physical and chemical factors affecting the tidal flat are grasped to predict the material balance between living things in the tidal flat, water systems, and bottom sludge. We propose continued operation and maintenance of the biotope. Results obtained are described below.1. Basic study related to creation and development of ecosystem in tidal flat developed land : Results of surveys of community development of planting species in a natural state revealed that Zizania latifolia, Schoenoplectus validus, and Typha angustifolia developed the community and formed a vegetation revetment. Furthermore, the larger the plant community, the more shellfish reside there. Submerged plants were planted in porous ceramics to develop a pl … More anting method.2. Grasping of formation processes of physical and chemical factors of tidal flat developed land : Measurements of EC and pH of the soil at the fresh water side from the waterfront line were higher than those at the continental area, both at the surface layer and 5cm below ground. Although sediment and local scour are generated according to the presence or absence of typhoons, development of the underground parts of plant communities made a great contribution.3. Survey of the pollution load from farmland flowing into Lake Kojima : Although the farmland has nitrogen reduction action, loading of phosphorus to the outside tends to increase concomitantly with increased amounts of applied fertilizer and precipitation.4. Survey of distribution of aquatic weeds and water pollution in Lake Kojima : Although mass generation of Trapa japonica occurred annually, no indication of regrowth of submerged plants was recognized. Regarding water quality, no tendency of phosphorus reduction was noticed.5. Model analysis of tidal flat developed land by data processing : Flows generated around an artificial tidal flat in Lake Kojima were analyzed quantitatively.As described above, establishment of an ecosystem according to its food chain, accumulation of organic substances, and purification of water quality were confirmed by planting of large aquatic weeds in the artificial tidal flat. However, based on these results, proposal of a method of operation and maintenance of the biotope is premature. Less