熱帯樹種の分布における空間的パターン
R Condit1, P S Ashton, P Baker
1Center for Tropical Forest Science, Smithsonian Tropical Research Institute, Unit 0948, APO AA 34002-0948, USA. ctfs@tivoli.si.edu
まとめ
熱帯の木種は,ランダムでない空間的なパターンを示し,そのほとんどはランダムな分布ではなく,集積を示しています. この集積パターンは,多様な森林タイプにおける希少種と一般的な種の両方に当てはまります.
科学分野:
- エコロジー エコロジー エコロジー
- 森林科学 林業科学 林業科学
- 空間統計に関する統計.
背景:
- 広範囲の熱帯雨林の樹木集計用プロット (25-52ヘクタール) が6つの異なる場所に設置され,空間的な人口パターンを調査しました.
- 研究は,これらの広大なプロット内の1768の樹種の空間的分布を評価することに焦点を当てました.
研究 の 目的:
- トロピカルツリー集団の空間的なパターンを評価する.
- 6つの熱帯雨林にわたる1768種の樹木の分布における集積の度合いを調べる.
主な方法:
- 6つの異なる熱帯雨林地帯の6つの異なる地域 (25-52ヘクタール) にわたる広域の樹木調査用地から得られたデータの分析.
- 個々の木の周りの円形の近所で同種の樹密度の調査.
- すべての個体 (>1cm直径) とより大きな木 (>=10cm直径) のランダム分布モデルに対する観察分布の比較.
主要な成果:
- ほぼすべての1768種の樹木は,樹木の大きさに関係なく,ランダムよりも多くの集積分布を示した.
- 集積パターンは,より大きな木 (>=10cm直径) をのみ考慮するときに持続しました.
- 希少樹種は,研究されたすべての森林で,一般的な種よりも多く集約されていることが判明しました.
結論:
- 熱帯樹種の分布は,ランダムではなく,主として集約されています.
- この集積パターンは,異なる熱帯雨林の種類と木の大きさにおいて一貫しています.
- 種の希少性は,より高いレベルの空間的集積と正に相関しています.
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