草原に木のある植物の侵入による生態系の炭素の損失
Robert B Jackson1, Jay L Banner, Esteban G Jobbágy
1Department of Biology and Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina 27708-0340, USA. jackson@duke.edu
Nature
|August 9, 2002
まとめ
草原に木のある植物の侵入は,炭素貯蔵を増やすことができますが,この効果は降雨量に依存します. 乾燥した地域は土壌の炭素を吸収し,湿った地域は土壌の炭素を吸収せず,地球上の炭素吸収を過大評価する可能性がある.
科学分野:
- エコロジー エコロジー エコロジー
- バイオジオケミストリー バイオジオケミストリー
- 気候変動科学 気候変動科学
背景:
- 草原,サバンナ,砂漠への森の植物の拡大は,生態系の炭素貯蔵を増やすとしばしば考えられています.
- この膨張は,地球上の炭素吸収源の有意ではあるが不確実な要因と考えられている.
研究 の 目的:
- 樹木植物の侵入が,降雨グラデーション全体で炭素と窒素予算に与える影響を調査する.
- 侵攻された草原と侵攻されていない草原における炭素と窒素の動態を比較するために.
主な方法:
- 隣接する草原の6組を研究し,木のある植物の侵入が様々でした.
- 分析された炭素と窒素の予算と,降水グラデントに沿った土壌デルタ (((13) Cプロファイル (2001,100 mm yr ((-1))).
- 侵攻された土地 (30~100年) と隣接する未侵攻の草原を比較した.
主要な成果:
- 降水と木の侵入による土壌の有機炭素と窒素含有量の変化との間の負の関係が観察されました.
- 乾燥した草原地域は土壌有機炭素を増加させ,湿った地域は著しい損失を被った.
- 湿気地域における土壌の炭素損失は,植物バイオマス炭素の増加を否定するのに十分な量であった.
結論:
- 陸上の炭素吸収槽は,木のある植物の侵入に依存する現在の評価によって過大評価されている可能性があります.
- 樹木植物の侵入が炭素貯蔵に及ぼす影響は,地元の降水量に大きく依存しています.
- 排出を相殺するために木質植物の侵入に依存することは,変動する炭素貯蔵効果のために不正確である可能性があります.
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