西マレーシア, パソーでの非フタバガキ科植物の埋土種子の生残と発芽 Survival and Germination of Buried Seeds of Non-Dipterocarp Species in a Tropical Rain Forest at Pasoh, West Malaysia

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熱帯多雨林の埋土種子の生残·発芽の過程を西マレーシアのパソー森林保護区で調査した,新鮮な充実種子を採取し,アルミニウム製の網で作成したバッグに詰めて,閉鎖林の土壌中5cmの深さに埋めた.埋設した種子を3ヶ月から3年後にかけて順次回収し,種子の状態をチェックした,またオープンサイトでの発芽試験を採取直後の新鮮な種子と,掘り出した種子について行った,種子の生残過程はワイブル分布モデルで回帰し,未発芽生残種子の平均寿命を推定した.原生林構成種の16%は1年以上の平均寿命を持っていたが,のこりは1年以下の短い寿命しかなかった.二次林種の平均寿命は15ヶ月から10年以上にぱらつき,1年以上の平均寿命をもつ種は77%に達した,さらに,種子の平均寿命は種子の発芽型,果実形態,種子重への強い依存性を示した.二次林種の長寿命種子は,オープンサイト条件下では急速に発芽するが,埋土種子集団ではほとんど発芽が記録されなかった.一方原生林構成種の長寿命種子は森林中でも緩やかに発芽し,彼らの遅延発芽は,種子をとりまく木質の内果皮によって引き起こされていると思われた.

The survival and germination of buried seeds in a tropical rain forest were examined for 45 spp. of woody plants at Pasoh Forest Reserve, West Malaysia, The fresh viable seeds were packed in bags made of aluminum mesh and were burried in soil at 5 cm depth under closed canopy. The seed bags were successively sarnpled at three months to three years after burial and the fate of seeds was checked. Germination tests under the open site conditions in a greenhouse were also conducted for fresh seeds and the exhumed seeds. Survival curves of bur{ed seeds were fitted by the Weibul distribution model and the mean life span of ungerminated viable seed was estimated. Although most primary forest species had short-lived seeds, 16% of primary forest specie$ had a mean life span exceeding one year, The mean life span of secondary forest species varied between shorter than 1,5 months and longer than ten years and 77% of secondary species had a mean life span exceeding one year. Furthermore, the mean life span of seed significantly depended on the germination type, fruit morphology, and seed weight. The long-lived seeds of secondary forest species germinated rapidly under open-site conditions, while few germinations were recorded for the seed population buried in the forest so{l, The long-lived seeds of primary forest species germinated slowly even in the forest soil, and their delayed germination in the forest soil may result from their woody endocarp surrounding seeds.

収録刊行物

  • Tropics

    Tropics 7(1), 9-20, 1997-10-30

    JAPAN SOCIETY OF TROPICAL ECOLOGY

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各種コード

  • NII論文ID(NAID)
    10012396053
  • NII書誌ID(NCID)
    AN10528811
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    0917415X
  • NDL 記事登録ID
    4335665
  • NDL 雑誌分類
    ZR1(科学技術--生物学)
  • NDL 請求記号
    Z18-3157
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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