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トロピカルフォレストは,地上での利益と損失の測定に基づいた純炭素源です
A Baccini1, W Walker2, L Carvalho3
1The Woods Hole Research Center, 149 Woods Hole Road, Falmouth, MA 04523, USA. abaccini@whrc.org.
まとめ
熱帯林は年間425.2Tgの炭素を排出する重要な純炭素源です. 森林伐採と森林破壊が世界の炭素バランスに与える影響を 強調しています
科学分野:
- エコロジー
- 環境科学
- リモートセンシング
背景:
- 熱帯の生態系における炭素のバランスは議論の余地があり,大気学的研究はシンクを示し,生態学的研究はソースを示唆している.
- 熱帯雨林の炭素動態の正確な定量化は,地球規模の気候変動を理解するために不可欠です.
研究 の 目的:
- 熱帯木質生植物の地上の炭素密度の年間純変化を定量化する.
- 熱帯雨林の純炭素交換に関する直接的な測定に基づく証拠を提供すること.
主な方法:
- 12年間 (2003年−2014年) のMODIS (中等解像度イメージングスペクトルラジオメーター) の熱帯衛星データを活用した.
- 熱帯木質生植物の地上の炭素密度における数値化された年間純変化
主要な成果:
- 熱帯林は年間425.2 ± 92.0テラグラムの炭素を排出する純炭素源である (Tg C年−1).
- 年間炭素損失は861.7 ± 80.2 Tg C年−1で,増加は436.5 ± 31.0 Tg C年−1であった.
- 森林の劣化と破壊は,全体的な炭素の損失の68.9%を占めました.
結論:
- 直接的な衛星測定は 熱帯雨林が大気中の炭素の 純源であることを確認しています
- 森林伐採と森林破壊は 熱帯雨林から排出される炭素の 主な要因で グローバルな炭素予算に影響を及ぼしています
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