Effects of the alien plant <i>Ammophila breviligulata</i> on coastal plants in the tsunami disaster area

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  • 津波被災地における外来植物オオハマガヤ（<i>Ammophila breviligulata</i> Fern.）が海浜植物に与える影響

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<p>This study focused on the distribution of the alien plant species Ammophila breviligulata and its effects on coastal plants. First, we investigated the distribution of A. breviligulata and the coastal plant species Leymus mollis using a small unmanned aerial vehicle. Next, we established five survey lines in a place where A. breviligulata dominates and investigated the vegetation and the light condition (PPFD) in 155 quadrats on each survey line. A. breviligulata was more abundant at an elevation of 1 to 2 m on the landward side of the seawall compared to L. mollis. The relative PPFD and the species number and cover of coastal plants decreased as the cover and height of A. breviligulata increased. The results suggest that the growth of coastal plants was inhibited in the landward area because of shading by A. breviligulata.</p>

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