Browsing effects of deer (<i>Cervus nippon yesoensis</i> Heude) on the growth of dwarf bamboo (<i>Sasa nipponica</i> Makino et Shibata) and the regeneration of tree seedlings

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Other Title
  • ミヤコザサの維持と樹木実生の更新にエゾシカの採食が与える影響
  • ミヤコザサ ノ イジ ト ジュモク ミショウ ノ コウシン ニ エゾシカ ノ サイショク ガ アタエル エイキョウ

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Browsing effects of deer on the growth of dwarf bamboo were studied at Shiranuka, Hokkaido where forest degradation caused by deer is reported. We also tried to reveal the relations among deer, dwarf bamboo and seedlings of tree species by investigation of seedbanks and seedlings. The aboveground part of dwarf bamboo was dwarfed and the biomass was reduced under browsing pressure. On the other hand, the underground biomass of dwarf bamboo increased and the rhizomes became longer under the light browsing pressure. However, the underground biomass was reduced seriously and seemed to vanish under the severe browsing pressure. Although dwarf bamboo is regarded to be tolerant to browsing pressure, the limit of its tolerance is shown. When the over- browsed dwarf bamboo was protected from browsing pressure, dwarf bamboo started to recover its aboveground part. The appearance of more seedlings at the site where dwarf bamboo is under the light browsing pressure suggests that the moderate biomass and density of dwarf bamboo gives a good influence on the survival of seedlings. Enough seed supply and developed seedbanks show that the seedling regeneration can be promoted by controlling the biomass of dwarf bamboo under the controlled deer density.

Journal

  • Forest research, Kyoto

    Forest research, Kyoto 74 (0), 77-86, 2002

    Field Science Education and Research Center, Kyoto University

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