温泉 は 温帯 の 葉 の 落ちる 樹木 の 成長 の タイミング を 変化 さ せる が,全体 的 に 変化 さ せる こと は あり ませ ん
Cameron Dow1,2, Albert Y Kim1,3, Loïc D'Orangeville4,5
1Conservation Ecology Center, Smithsonian's National Zoo & Conservation Biology Institute, Front Royal, VA, USA.
Nature
|August 10, 2022
まとめ
暖かい春の気温は 樹幹の成長を促進しますが 温帯の森林では 長期にわたる炭素の蓄積を増加させません これは温暖化が森林を 大きく改善しないことを示唆しています
科学分野:
- 森林の生態学
- 気候変動の影響
- 炭素を吸収する
背景:
- 温帯落葉林は 葉が早く出て CO2が吸収され 春が暖かくなります
- 成長期の長さと年間CO2吸収の増加が観察されています.
- 春の気温が樹幹の成長と炭素の蓄積に与える影響は まだよくわかっていない.
研究 の 目的:
- 暖かい春の気温が 樹幹の直径の成長に どう影響するか調べるため
- 成長期の長さ,最大成長率,年間成長への影響を決定する.
- 春の温暖化が木質バイオマスの長期的炭素吸収に与える影響を評価する.
主な方法:
- デンドロメーターで2つの森の440本の木を測定しました
- 北米東部の108の森林から 207の樹輪年代分析.
- 春の気温の影響と,ピークの季節の気温が木の成長に及ぼす影響の比較
主要な成果:
- 暖かい春の気温は 樹幹の直径の伸びのタイミングを早めた
- 成長期のピークの長さ,最大成長率,または年間成長に一貫した影響は見つかりませんでした.
- 年間リングの幅は,春の温度よりも成長期のピーク温度に敏感でした.
結論:
- 温泉による二酸化炭素の早期吸収は,木茎のバイオマスによる炭素の蓄積を増加させるものではない.
- 経験的なデータは グローバルな炭素サイクルモデルに 矛盾しています
- 春の気温上昇は 温帯の葉の森の 長期の炭素吸収能力を 大きく高める可能性はない.
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