Potential for restoring grassland plant species on an abandoned forested Miscanthus grassland using the soil seed bank as a seed source

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  • 管理放棄後樹林化したススキ型草地における埋土種子による草原生植物の回復可能性
  • カンリ ホウキ ゴ ジュリンカ シタ ススキガタ ソウチ ニ オケル マイド シュシ ニ ヨル ソウゲンセイ ショクブツ ノ カイフク カノウセイ

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Abstract

We evaluated the key constraints in restoring the vegetation of abandoned overgrown woodland that developed on once semi-natural grassland by analyzing the seed bank persistence of typical semi-natural grassland species. Approximately half of the grassland species recorded in the above-ground vegetation in typical semi-natural grassland were either scarce or absent in the soil seed bank. This scarcity indicates that the potential for grassland species restoration using the soil seed bank may be limited. Conversely, more than half of the grassland species recorded in the soil seed bank produced long-term persistent seeds, which may insure population re-establishment after restoration, even if the plants have disappeared from the vegetation. One year after the restoration treatment, 11 new grassland species emerged in the restored site. These new populations were suspected of having arisen from long-term persistent seeds in the soil, seeds dispersed from the edge vegetation, or 'bud-bank' or vegetative parts in the soil. The results of this study emphasize the importance of information not only on seed bank persistence but also on other traits related to plant reproduction or regeneration for the effective restoration of semi-natural grassland communities.

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