冷温帯針広混交林のギャップ形成パターンが林木種の更新過程に与える影響

• 渡辺 修

  北海道大学自然保護研究会

• 久保田 康裕

  北海道大学自然保護研究会 (現)京都大学生態学研究センター

書誌事項

タイトル別名

• Effects of gap formation pattern on the regeneration process of a cool-temperate mixed forest in Shiretoko National Park, northern Japan.
• レイオンタイシン コウコンコウリン ノ ギャップ ケイセイ パターン ガ リン

抄録

We investigated gap attributes : the species of gap maker, the mode of gap formation (standing dead, stem broken and uprooted), gap area and gap age, together with gap successors (2m≦height<10m)in a mixed forest in Shiretoko National Park, northern Japan. Canopy gap was defined as the vertical projection area where no stems reached 10m height or 10cm d.b.h. We focused on the effects of gap attributes on the occurrence pattern of gap successors for each species, and then discussed the mechanisms of the regeneration processes of the component species. The stand was composed of 25 tree species, and the canopy (>10 m height) was dominated by Abies sachalinensis, Quercus mongolica var. grosseserrata and Acer mono, bringing about a stratified structure. Mean expanded gap area was 210m^2,and the ratio of gaps in the canopy was 37%. Most gaps were due to multiple tree death. Most gap makers were Abies sachalinensis. In minor species (relative biomass and density ratios<5%), the occurrence pattern of gap successors was mainly governed by the gap attributes. Betula ermanii, Fraxinus mandshurica var. japonica and Prunus maximowiczii were associated with uprooted gaps. Kalopanax pictus and Prunus maximowiczii were associated with large and small gaps, respectively. Phellodendron amurense was associated with young gaps. In major species (relative biomass and density ratios ≧5%), however, the occurrence pattern was governed by the distributional pattern of advance regenerated saplings under the closed canopy, rather than by gap attributes. In conclusion, the species richness of a northern mixed forest was promoted by the co-occurrence of minor species associated with the diversity of the gap attributes, whereas the species diversity of the major species was ascribed largely to the persistence mechanisms of trees under the closed canopies prior to gap creation.

収録刊行物

• 日本生態学会誌

  日本生態学会誌 46 (3), 233-243, 1996

  一般社団法人 日本生態学会

キーワード

• Gap attributes, Coexistence, Species diversity, Species richness

詳細情報

• CRID: 1390282679269379456
• NII論文ID: 110001882038
• NII論文ID: 10012075672
• NII書誌ID: AN00193852
• DOI: 10.18960/seitai.46.3_233
• ISSN: 2424127X
• ISSN: 00215007
• NDL書誌ID: 4129698
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4129698
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可