温帯雨林と北極雨林の炭素循環における人間の足跡
Federico Magnani1, Maurizio Mencuccini, Marco Borghetti
1Department of Fruit Tree and Woody Plant Science, University of Bologna, Bologna I-40127, Italy. federico.magnani@unibo.it
Nature
|June 15, 2007
まとめ
人間の活動,特に窒素の堆積は,北半球の温帯および北半球の森林における炭素の蓄積の主な要因である. 干渉は炭素の動態に大きな影響を与えるが,窒素は
科学分野:
- 森林生態学 森林生態学 森林生態学
- バイオジオケミストリー バイオジオケミストリー
- 気候科学 気候科学
背景:
- 温帯雨林と北極雨林は,年間0.6-0.7 Pg Cを吸収する,重要な炭素吸収源である.
- 森林の炭素バランスは,CO2,気温,管理,窒素堆積によって影響を受けます.
- 測定ネットワークは,二酸化炭素の吸収に及ぼす干渉の影響を説明するのに苦労しています.
研究 の 目的:
- 森林の炭素収縮の原動力を解明する.
- 森林の炭素動態における干渉と窒素堆積の役割を評価する.
- 人為的な活動が森林の炭素バランスに与える影響を評価する.
主な方法:
- スタンド置換による干渉後の時間動態の分析.
- 混乱の混同効果を考慮しないための統計モデリング.
- 純炭素収縮の原動力としての窒素堆積の評価.
主要な成果:
- 干渉のダイナミクスは,炭素結合の変動性の大きな部分を説明します.
- 干渉を考慮すると,窒素堆積が封じ込めの支配的な要因である.
- 観察された窒素堆積効果は一貫して陽性であり,広範囲にわたる窒素飽和はないことを示唆しています.
結論:
- 森林管理と窒素堆積を通して,人間の活動が最終的に森林の炭素バランスを制御します.
- 窒素の堆積は,温帯および北極林の炭素吸収能力に影響を与える重要な要因です.
- 窒素堆積と封じ込めの間の正の相関は,自然生態系の窒素飽和の仮定に異議を唱える.
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