浚渫跡地での埋め戻しによるアマモ場の回復 Restoration of Eelgrass (Zostera marina L.) Beds by Filling up Borrow Pits with Natural Sediment

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The objective of this study was to evaluate the restoration of eelgrass (Zostera marina L.) beds by filling up borrow pits along the coast of Iwakuni, in the Seto Inland Sea, Japan. We constructed an eelgrass habitat at the edge of previously constructed borrow pits in eelgrass beds by filling up the pits with natural sediment. We monitored sand movement, underwater irradiance and eelgrass shoot density in the constructed and natural habitats. Sand movement in the constructed habitat was from -8 cm to 9 cm, which is slightly different from that in the natural habitat. The averaged underwater irradiance in the constructed habitat was more than 3 mol photons · m-2 · day-1, which was the amount necessary for eelgrass. Eelgrass disappeared after typhoon occurrences in 2004-2006, whereas seedlings of eelgrass have continuously appeared in the constructed and natural habitats every winter. These results suggest that the restoration of eelgrass habitats by filling up borrow pits is a useful technique for eelgrass bed restoration.The objective of this study was to evaluate the restoration of eelgrass (Zostera marina L.) beds by filling up borrow pits along the coast of Iwakuni, in the Seto Inland Sea, Japan. We constructed an eelgrass habitat at the edge of previously constructed borrow pits in eelgrass beds by filling up the pits with natural sediment. We monitored sand movement, underwater irradiance and eelgrass shoot density in the constructed and natural habitats. Sand movement in the constructed habitat was from -8 cm to 9 cm, which is slightly different from that in the natural habitat. The averaged underwater irradiance in the constructed habitat was more than 3 mol photons · m-2 · day-1, which was the amount necessary for eelgrass. Eelgrass disappeared after typhoon occurrences in 2004-2006, whereas seedlings of eelgrass have continuously appeared in the constructed and natural habitats every winter. These results suggest that the restoration of eelgrass habitats by filling up borrow pits is a useful technique for eelgrass bed restoration.

The objective of this study was to evaluate the restoration of eelgrass (<i>Zostera marina</i> L.) beds by filling up borrow pits along the coast of Iwakuni, in the Seto Inland Sea, Japan. We constructed an eelgrass habitat at the edge of previously constructed borrow pits in eelgrass beds by filling up the pits with natural sediment. We monitored sand movement, underwater irradiance and eelgrass shoot density in the constructed and natural habitats. Sand movement in the constructed habitat was from -8 cm to 9 cm, which is slightly different from that in the natural habitat. The averaged underwater irradiance in the constructed habitat was more than 3 mol photons · m<sup>-2</sup> · day<sup>-1</sup>, which was the amount necessary for eelgrass. Eelgrass disappeared after typhoon occurrences in 2004-2006, whereas seedlings of eelgrass have continuously appeared in the constructed and natural habitats every winter. These results suggest that the restoration of eelgrass habitats by filling up borrow pits is a useful technique for eelgrass bed restoration.

収録刊行物

  • 水環境学会誌 = Journal of Japan Society on Water Environment  

    水環境学会誌 = Journal of Japan Society on Water Environment 31(4), 217-221, 2008-04-10 

    日本水環境学会

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各種コード

  • NII論文ID(NAID)
    10021158521
  • NII書誌ID(NCID)
    AN10372439
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09168958
  • NDL 記事登録ID
    9471460
  • NDL 雑誌分類
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL 請求記号
    Z16-1045
  • データ提供元
    CJP書誌  NDL  IR  J-STAGE 
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