Stand Structure of an Abandoned Deciduous Broadleaf Secondary Forest Adjacent to Lucidophyllous Forest and Agricultural Fields.

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  • 照葉樹林および耕作地に隣接する管理放棄された落葉広葉樹二次林の林分構造の変化
  • テリハ ジュリン オヨビ コウサクチ ニ リンセツ スル カンリ ホウキ サレタ オチバ コウヨウジュ ニジリン ノ ハヤシ ブン コウゾウ ノ ヘンカ

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In fragmented and abandoned forests near urban areas, vegetation succession often follows a plagiosere, but the direction of succession may vary depending on the surrounding landscape. We investigated edge effects and five-year change in stand structure of an abandoned secondary deciduous forest located adjacent to agricultural fields and near lucidophyllous forest. In the secondary forest, the number and basal area of evergreen-species increased, while many small individuals of deciduous species died. Size, number, and basal area of evergreen species increased from forest edge to interior, while mortality of deciduous species increased during the five-year study period. Although newly established trees included many bird-dispersed species, more than half of these were lucidophyllous forest components, dispersal was not concentrated near the forest edge, and no ornamental or invasive species were observed. Thus, we inferred that the vegetation change in the secondary forest is not following a plagiosere.We predict that evergreen species will spread from the interior toward the forest edge, shade-tolerant evergreen species will increase in the lower canopy, and tree species composition of the secondary forest will become more similar to the nearby lucidophyllous forest. In a landscape where mature forests may function as seed sources, vegetation change in fragmented and abandoned forests may not divert to a plagiosere.

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