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

在富营养化封闭水系统中利用疏浚污泥和水草进行滩涂开发试验。

基本信息

批准号：
16380161
负责人：
OKI Yoko
金额：
$ 10.22万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16380161/
关键词：
Eutrophic lake Artificial tidal flat development Aquatic weed community Water quality Biotope Polluted load Planting technology Environment conservation activities 栄養体繁殖微地形変化水流解析

项目摘要

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

本研究试图在位于冈山县南部的小岛湖，利用疏浚的污泥在人工潮滩上培育水草群落，从而创造一个生物群落，减少水污染。掌握影响潮滩的物理和化学因素的变化，预测潮滩生物、水系和底层污泥之间的物质平衡。我们建议继续操作和维护生物群落。所得结果说明如下：1。滩地生态系统形成与发展的基础研究：对自然状态下植物群落发展的调查结果表明，紫荆（Zizania latifolia）、松柏（Schoenoplectus validus）和风叶（Typha angustifolia）群落发育并形成植被护岸。此外，植物群落越大，贝类就越多。在多孔陶瓷中种植浸没植物，以开发一种更有效的方法。潮滩发育地理化因子形成过程的把握：滨水线附近淡水侧土壤的EC和pH值测量值，无论在表层还是地下5cm处，都高于大陆区。虽然台风的有无会产生泥沙和局部冲刷，但植物群落地下部分的发育起了很大的作用。农田流入小岛湖的污染负荷调查：虽然农田具有氮还原作用，但磷向外的负荷随着施肥量和降水量的增加而增加。小岛湖水草分布与水污染调查：虽然每年都有大量的日本刺槐发生，但没有发现沉水植物再生的迹象。水质方面，无磷还原趋势。基于数据处理的潮滩开发地模型分析：对小岛湖人工潮滩周围的流量进行了定量分析。如前文所述，通过在人工潮滩种植大型水草，确定了生态系统的食物链建立、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。少