Natural Regeneration of a Mixed Conifer-broadleaf Forest, Including Various Timber Species, after Strip Clear-cutting and Scarification of a <i>Larix kaempferi</i> Plantation

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  • カラマツ人工林における地掻き処理を伴った帯状皆伐による多樹種混交林の天然更新
  • カラマツ ジンコウリン ニ オケル チ カキ ショリ オ トモナッタ タイジョウ カイバツ ニ ヨル タジュシュ コンコウリン ノ テンネン コウシン

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Abstract

We examined the natural regeneration of trees after strip clear-cutting and scarification of a Larix kaempferi plantation in Iwate Prefecture, northern Japan. In the understory of the intact plantation, the density of broadleaf trees with DBH more than 3 cm was 693 stems/ha (500 individuals/ha) for canopy species such as Quercus crispula, Acer mono, and Magnolia hypoleuca, and the density was 236 stems/ha (207 individuals/ha) for subcanopy species such as Padus grayana, Morus australis, and Aria alnifolia. Fourteen years after clear-cutting and scarification, the density of multi-stem regenerating trees was 777 stems/ha (173 individuals/ha) for canopy species and 138 stems/ha (58 individuals/ha) for subcanopy species. The density of singlestem regenerating trees was 1,854 stems/ha for canopy species and 323 stems/ha for subcanopy species. Some single-stem-dominant species such as Betula maximowicziana, Betula platyphylla, L. kaempferi, and Pinus densiflora were not found in the understory of the intact plantation. It was concluded that clear-cutting facilitated sprouting from advanced trees and that scarification facilitated seedling emergence and establishment of light-demanding species. Therefore, combining clear-cutting with scarification has the potential to promote successful natural regeneration of various timber species and to convert a L. kaempferi plantation to mixed conifer-broadleaf forest.

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