コメント on "鉄器時代の中央アフリカにおける気象化と土地利用の強化"
K Neumann1, M K H Eggert, R Oslisly
1Goethe University, Institute of Archaeological Sciences, Frankfurt, Germany. k.neumann@em.uni-frankfurt.de
まとめ
大西洋の沈殿体の中核における異常に高いアルミニウムとカリウムの比率は,2500年前の人間の森林破壊を示さない. その代わり,熱帯雨林の危機は,主に重大な気候変動によって引き起こされた.
科学分野:
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- 環境科学 環境科学
- 地質化学 地質化学
背景:
- 以前の研究では,人類による森林破壊が現在 (BP) よりも約2500年前に起こったと示唆されていた. 堆積物のコアデータに基づいています.
- 大西洋の沈殿体の中核に含まれるアルミニウムとカリウムの比率が高く,人間による森林破壊の証拠として解釈された.
研究 の 目的:
- 大西洋の沈殿体内におけるアルミニウムとカリウムの比率の解釈を再評価する.
- 紀元前3千年期の熱帯雨林危機の主な原因を特定する.
主な方法:
- 大西洋からの堆積物核の分析.
- 地化学マーカーの再検討 (アルミニウム・カリウム比).
- 人間への地球上の影響に関する証拠の評価.
主要な成果:
- B.P.2500年頃の人間に起因した森林伐採が広範囲に広がったことを支持する地上の証拠はありません.
- アルミニウムとカリウムの比率は,人為的な活動だけを示すものではない.
- 気候変動は,B.P.第3千年期の支配的な要因として特定されています. 雨林の危機 雨林の危機
結論:
- 堆積物のコアデータに基づく人類による森林破壊の解釈は異議を唱える.
- 古代の熱帯雨林の危機の主な原因は,人間の活動ではなく,気候変動でした.
- 植生に対する古気候の影響を完全に理解するためには,さらなる研究が必要である.
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