アパタイトの菌根性気象は,塩基不良の森林生態系における重要なカルシウム源である
Joel D Blum1, Andrea Klaue, Carmen A Nezat
1Department of Geological Sciences, University of Michigan, 425 East University Avenue, Ann Arbor, Michigan 48109, USA. jdblum@umich.edu
Nature
|June 18, 2002
まとめ
米国北東部の森林は,酸性堆積によりカルシウムを失っている. アパタイトの気象は,木々によって利用される重要なカルシウム源を提供し,生態系の回復を潜在的に助けます.
科学分野:
- 森林生態学 森林生態学とは
- 地質化学 地質化学
- 環境科学 環境科学
背景:
- 米国北東部の森林におけるカルシウム減少は,酸性堆積と関連しており,生態系の回復を妨げています.
- 現存するカルシウム源 (大気堆積,シリケート気象) は,森林流の観測されたカルシウム出力をバランスとしていない.
- 交換可能および有機的に結合された土壌プールからカルシウム損失が疑われる.
研究 の 目的:
- ハバード・ブルック実験森林のカルシウム源を調査する.
- 森林のカルシウム予算へのアパタイト溶解の貢献を定量化する.
- アパタイトからカルシウムを吸収する際に菌根菌の役割を決定する.
主な方法:
- カルシウムとストロンチウム濃度の分析.
- ストロンチウムイソトープ比の測定.
- 土壌,植生,水文学的サンプルを検査する.
主要な成果:
- アパタイト溶解は,大気堆積とシリケート気象に匹敵するカルシウム源として特定されました.
- アパタイト由来カルシウムは主にエクトミコリザル樹種によって利用されます.
- 菌根菌の吸収は,交換可能な土壌プールを回避する可能性があります.
結論:
- アパタイト気象は,森林の生態系におけるカルシウムに大きく寄与する.
- 菌根性結合は,アパタイト由来カルシウムにアクセスする上で重要な役割を果たします.
- 土壌酸性化とカルシウム循環の影響を評価する際には,アパタイト気象を考慮する必要があります.
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