アフリカの無傷の熱帯雨林の炭素貯蔵を増やす
Simon L Lewis1, Gabriela Lopez-Gonzalez, Bonaventure Sonké
1Earth and Biosphere Institute, School of Geography, University of Leeds, Leeds LS2 9JT, UK. s.l.lewis@leeds.ac.uk
Nature
|February 20, 2009
まとめ
アフリカの熱帯雨林は,アマゾンの森林と同様に,炭素貯蔵量を増加させています. これは,変化する環境要因による可能性のある,重要な炭素吸収源として機能する古い成長森林のパン熱帯現象を示唆しています.
科学分野:
- エコロジー エコロジー エコロジー
- 気候科学 気候科学
- 林業 林業 林業 林業 林業
背景:
- 地球上の植物の環境変化への反応は,大気中の二酸化炭素レベルを予測するのに極めて重要です.
- 熱帯雨林は,高い炭素密度と生産性により,重要な炭素吸収源です.
- アフリカの熱帯雨林の炭素貯蔵のダイナミクスは,依然として量化されていない.
研究 の 目的:
- アフリカの熱帯雨林における炭素貯蔵の変化を評価する.
- アフリカの森林が,アマゾンで観察されたように,同様の炭素収縮傾向を示すかどうかを決定する.
- アフリカの熱帯雨林の大陸規模の炭素吸収能力を推定する.
主な方法:
- アフリカの熱帯雨林の長期モニタリング用プロットの10カ国のネットワークから得られたデータを利用した.
- 1968年から2007年まで79のプロット (163ヘクタール) にわたる生木の地上の炭素貯蔵を分析した.
- 計測されていない森林の構成要素に推定され,大陸に拡大された.
主要な成果:
- 生きている木の地上の炭素貯蔵は,アフリカの森林では0.63MgC ha (−1) 年 (−1) 増加した.
- アフリカの熱帯雨林の樹木の合計増加は,0.34 Pg C yr ((-1) と推定されています.
- アフリカ,熱帯アメリカ,アジアからのデータを組み合わせると,熱帯全体で0.49MgC ha{-1} yr{-1} 増加し,合計で1.3PgC yr{-1} sink.
結論:
- 古い成長の熱帯雨林の炭素貯蔵を増やすことは,汎熱帯現象です.
- アフリカの熱帯雨林は,世界の炭素吸収に大きく貢献しています.
- 大気中の二酸化炭素濃度の上昇は,森林の炭素貯蔵量の増加の潜在的な要因である.
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