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熱帯雨林での実験的な温暖化による土壌の炭素の損失
Andrew T Nottingham1,2, Patrick Meir3,4, Esther Velasquez5
1School of Geosciences, University of Edinburgh, Edinburgh, UK. Andrew.Nottingham@ed.ac.uk.
Nature
|August 14, 2020
まとめ
熱帯森林の土壌の温暖化により 二酸化炭素の排出量が55%増加し 熱帯土壌の炭素は気温上昇に敏感で 気候変動を加速する可能性があることを示しています
科学分野:
- エコロジー
- 気候科学
- 土壌科学
背景:
- 熱帯の土壌は 地球上の土壌の炭素の大部分を 貯蔵しています
- 熱帯地域で予想される温暖化は この炭素貯蔵庫を不安定化させる可能性があります
- 以前の研究では 熱帯雨林での 実験的な温暖化データはありませんでした
研究 の 目的:
- 熱帯林土の炭素排出量に対する実験的な温暖化の影響を調査する.
- 熱帯土壌から排出される二酸化炭素を 定量化するためです
主な方法:
- 低地熱帯森林の土壌を2年間,4°Cで温める実験
- 土壌の二酸化炭素 (CO2) 排出量の測定
- 呼吸速度,酵素活動,微生物の炭素使用効率の分析
主要な成果:
- 温暖化によって土壌のCO2排出量は 環境温度と比較して55%増加しました
- この増加は,年間"ヘクタールあたり8.2 ± 4.2トンの炭素の損失を表しています.
- 呼吸速度の適応や酵素活性や微生物の炭素使用効率の変化は観察されなかった.
結論:
- 熱帯雨林の土壌の炭素は 温暖化に非常に敏感です
- 温暖化による炭素の放出は 気候変動に大きく影響する可能性があります
- 実験的な温暖化により 炭素の損失の危険性は 以前から考えられていたよりも 大きくなります
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