Effect of Accretion Cutting and Deer-exclosure Fences on Regeneration of Broad-leaved Trees in Riparian Conifer Plantations Diminished by Sika Deer Grazing

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  • シカの採食圧を受けてきた渓畔域の針葉樹人工林での広葉樹の更新に対する受光伐と植生保護柵の効果
  • シカ ノ サイショクアツ オ ウケテ キタ ケイハンイキ ノ シンヨウジュ ジンコウリン デ ノ コウヨウジュ ノ コウシン ニ タイスル ジュコウバツ ト ショクセイ ホゴ サク ノ コウカ

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Abstract

<p>We investigated species number, number of individuals and height of regenerated trees inside and outside of deer-exclosure fences 5 or 6 years after construction following accretion cutting in three riparian conifer plantations, to examine the possibility of restoring riparian forests of the Tanzawa Mountains in Kanagawa Prefecture. Eighteen to 36 species of regenerated trees emerged in three study sites, Shiraishisawa (SH), Youkisawa (YO), and Hontanigawa (HT). Regenerated trees such as Euptelea polyandra, Zelkova serrata, Acer pictum subsp. pictum f. ambiguum, Carpinus tschonoskii, Carpinus japonica and 8 other species emerged in all three study sites. Anemochory comprised the largest number of species and individuals of regenerated trees, and more than half of regenerated tree species and 80% individuals of regenerated trees were accordant with riparian tree species within 30 m from the study sites. The individual number of regenerated trees over 150 cm in height inside the fences was 27,500/ha in SH, 2,083/ha in YO and 7,500/ha in HT. Regenerated pioneer trees such as Euptelea polyandra ranked relatively high in height. There were fewer species and individuals of regenerated trees outside the fences than inside them, and Pterostyrax hispida alone was over 30 cm in height. These results indicate that three riparian plantations hold the possibility of shifting to mixed forests with coniferous and riparian broadleaved species after construction of deer-exclosure fences following accretion cutting.</p>

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