ヒルギダマシ植林による砂漠沿岸緑化に関する研究 : 養殖廃水を利用したヒルギダマシ植林と形成された生態系

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The gray mangrove, Avicennia marina (Forsk.) Vierh, used for afforestation in the United Arab Emirates, grows slow along desert coastlines and adopts a dwarf growth habit. There is no river flow to the desert coast providing nutrients to the mangroves, unlike the situation in tropical rain regions. Aquaculture waste water, which is rich in nutrients, was examined to see whether it could be an adequate sustainable fertilizer for growing gray mangroves in areas of afforestation. Experimental afforestation was conducted along the drainage channel of fish culture tanks and ponds. This waste seawater had a significant effect on the growth of gray mangroves, and a dense artificial mangrove forest was established from initial seeding along the drainage channel, without the need for any maintenance. The soil under the forest was changed from the original beach sand to organic-rich fine sand by the activity of benthos inhabiting the intertidal zone under the mangroves. There were many insects in the forest and fish fry in the channel, and birds sought food around the forest area. These results indicate that a vital ecosystem can be created under sustainable maintenance when afforestation with gray mangrove is combined with aquaculture.
2004-04-20