報告書番号

U88030

タイトル（和文）

電源立地点の藻場造成技術の開発 第10報 －播種によるアマモ場造成法－

タイトル（英文）

Development of Techniques for Marine Macrophyte Bed Creation in the Coastal Zone Near Power Plant-10 -- Meathod for eelgrass (Zostera marina L.) bed creation by seeding.

概要 （図表や脚注は「報告書全文」に掲載しております）

当所ではこれまで栄養株移植によるアマモ場造成法についての研究を行ってきたが，本研究では比較的労力を要しない播種によるアマモ場造成法について，特に問題となる播種適期と砂の動きの影響などを陸上水槽および小田和湾での実験を行って検討した。その結果，播種適期は10月から11月の間，種子は6cmまで砂に埋まっても出芽できること，発芽体はその草丈と同じ深さ砂に埋まると枯死することおよび小田和湾では砂の動きが大きく種子が流失しやすいことなどが分かった。以上の結果とこれまでの知見に基づき，播種によるアマモ場造成適地選定基準とその造成手順を提案した。

概要 （英文）

We have been studying eelgrass bed creation as a mitigation measure for construction of coastal power plant since 1982. The cost of creating eelgrass bed by the vegetative shoot transplanting method seems to be higher than that by seeding method. So, we examined on the best seeding time and the effect of sediment drifting on germination ratio or survival ratio of seedlings in an out door tank or in Odawa Bay, central Japan, to clarify good environmental conditions for the growth of seedlings. The results are as follows. 1. The best seeding time was October to November. 2. Eelgrass seeds germinated normally when buried 6cm in the sediment from Odawa Bay, But did not germinate when buried more than 9cm. 3. All of seedlings died within two months when they were completely buried in the sediment. 4. Sand bottom change was heigh by wave action at Odawa Bay in winter. So, sowed Zostera seeds were carried to the other place and number of seedlings was very low. From these results and some literatures note, we guggest the good conditions for the growth of Zostera seedlings and a procedure to create eelgrass bed by a seeding method.

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