気候変動に対する森林の回復力の低下の兆候

Giovanni Forzieri^1,2, Vasilis Dakos³, Nate G McDowell^4,5

¹European Commission, Joint Research Centre, Ispra, Italy. giovanni.forzieri@unifi.it.

Nature

|July 13, 2022

まとめ

森林の回復力は世界的に気候変動により低下しており,熱帯,乾燥,温帯の森林が最も影響を受けています. ボレアル森林の傾向は様々ですが全体として森林は干渉に耐える能力を失っています

科学分野:

エコロジー
気候変動科学
リモートセンシング

背景:

森林の生態系は破壊から回復するために回復力に依存しています
気候変動による森林のレジリエンスの変化に関する懸念は存在し,その進化の理解は限られている.
実験的な証拠は木の死亡率の増加を示し森林の回復力の違いを強調しています

研究の目的:

衛星データと機械学習を用いて2000年から2020年にかけての森林の回復力の変化を評価する.
森林のレジリエンスを測定する
森林のレジリエンスの変化の地域的なパターンと要因を特定する.

主な方法:

衛星ベースの植生指標と機械学習アルゴリズムの統合
森林の回復力を測定する
異なるバイオム (熱帯,乾燥,温帯,北極) における森林の回復力傾向の分析

主要な成果:

熱帯,乾燥地域,温帯地域における森林の回復力の大幅な低下は,水の制限と気候の変動に関連しています.
ボレアル森林は,温暖化とCO2肥料化による可能性のある平均的な回復力傾向で,異なる局所的なパターンを表しています.
回復力の低下は,森林の原始生産性の急激な低下と関連しており,23%の原始森林が危機的状況に達しています.

結論:

森林の回復力の大幅な低下は干渉に耐える能力の低下を示しています
気候変動はこれらのレジリエンス変化の重要な原動力です
森林のレジリエンスを陸上での緩和と適応戦略に組み込む必要性を強調しています.

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