Restoration Technique for Eutrophied Sea Environment by using Circulation Function of Organic Matter in Ecosystem

利用生态系统有机质循环功能修复富营养化海洋环境技术

• 批准号: 10558094
• 负责人: MURAKAMI Hitoshi
• 金额: $ 8.64万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10558094/
• 关键词: Eutrophication; Sea Cucumber; Mytillus edullis; Ecosystem Engineering; Asteroidea; Circulation Function of Organic Matter; Restoration Technique for Ecosystem; Hypoxia; 底泥; ナマコ; ポーラスコンクリート; 栄養塩; 難分解性有機物; 海水; 硫化物; 有効細菌; ゴカイ; チッソ; リン; 浄化

Deterioration of bottom sediment and eutrophication of water quality have proceeded in inner bay and harbor. A vertical construction of breakwater which prevails in an enclosed sea area had reduced the complexity of habitats for marine organisms, causing unbalance of material cycle function between pelagic and bottom ecosystems. We aimed to devise a new type of breakwater that would provide a space for benthic organisms and facilitation of material cycle in an aquatic ecosystem. We also focussed on sediment reworking by feeding behavior of a common sea cucumber Stichopus japonicus inhabiting the bottom.A preliminary steel plant was set in the front of the breakwater at the Okinosu harbor located in Tokushima city in December 1999. We conducted several investigations to elucidate the characteristics of the plant including community structures and environmental conditions. Field experiments using sea cucumbers were also carried out at the two sites, Komatsushima port and the lagoon of Rinku Park in Osaka Prefecture.A common mussel Mytilus galloprovincialis dominated at both the plant and the vertical wall of breakwater. Dissolved oxygen concentration at the bottom was decreased below 2 mg/1 inside the plant whereas that outside the plant was remained 4 mg/1 in August. The amount of deposited seston was greater outside the plant than inside it. Relatively low concentrations of dissolved oxygen were resulted from the excessive biomass of mussels on the wall structure of the plant. We need to improve structure of the plant in order to provide habitats for benthic organisms such as sea cucumbers.The characteristics of sediment were different due to the presence of a sea cucumber in both experimental sites. The fact that AVS contents were decreased in the presence of sea cucumbers suggested that S.japonicus had an important role in sediment reworking in a closed aquatic environment.

内湾、港湾底质恶化，水质富营养化加剧。在封闭海域普遍存在的直立式防波堤结构降低了海洋生物栖息地的复杂性，导致海洋上层生态系统与底层生态系统物质循环功能失衡。我们的目的是设计一种新型的防波堤，将提供一个空间的底栖生物和促进物质循环的水生生态系统。1999年12月，在位于德岛的冲之巢港防波堤前建造了一个初步的钢铁厂。我们进行了几次调查，以阐明植物的特征，包括群落结构和环境条件。此外，还在日本大坂府小松岛港和琉球公园的潟湖进行了海参的现场试验，结果表明，一种常见的贻贝Mytilus galloprovincialis在防波堤的植物和垂直壁上都占优势。8月份，工厂内底部溶解氧浓度降至2 mg/l以下，而工厂外底部溶解氧浓度维持在4 mg/l。悬浮物在植物体外的沉积量大于植物体内的沉积量，植物体壁结构上的贻贝生物量过多导致溶解氧浓度相对较低。我们需要改善植物的结构，以便为底栖生物（如海参）提供栖息地。两个实验地点的沉积物特性因海参的存在而有所不同。海参的存在降低了沉积物中AVS的含量，这一事实表明，在封闭的水生环境中，S. p.在沉积物改造中起着重要作用。

项目成果

Kurata Kengo: "Influence of sea cucumber on sediment improvement in a closed aquatic environment"International Symposium on Sediment Quality Assesment. 4th. (2000)

仓田健吾：“海参对封闭水生环境中沉积物改良的影响”国际沉积物质量评估研讨会。

Kurata Kengo: "Influence of sea cucumber on sediment improvement in a closed aquatic environment"International Symposium on Sediment Quality Assessment. 4th. (2000)

仓田健吾：“海参对封闭水生环境中沉积物改善的影响”沉积物质量评估国际研讨会。

倉田健悟: "堆積物食者マナマコによる底質改善効果の測定"土木学会四国支部技術研究発表会. 第6回. 506-507 (2000)

Kengo Kurata：“沉积物供给麦间子的沉积物改善效果的测量”日本土木工程师学会四国分会技术研究报告第 6 期（2000 年）。

Hitoshi Murakami: "Quantification of Sediment Purification Function by using Stichopus japonica"Proc.of JSCE. 46th. 1226-1230 (1999)

村上仁：“利用海参净化沉积物的功能的量化”，JSCE 论文集。

Kengo Kurata: "Evaluation of Effective of Sediment Purification by uising Stichopus japonica"Proc.of JSCE, Shikoku Branch. 6th. 506-507 (2000)

Kengo Kurata：“利用海参净化沉积物的效果的评估”，JSCE 四国分会论文集。