北部の植物の生産性に対する春の温暖化の季節的補償効果
Wolfgang Buermann1,2, Matthias Forkel3, Michael O'Sullivan4
1Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK. wolfgang.buermann@geo.uni-augsburg.de.
Nature
|October 5, 2018
まとめ
北部の生態系における温泉は,増加する水不足により,植物の生産性に負の遅延効果をもたらす可能性があります. これらの影響は広範囲に及ぶが 現在の気候モデルでは完全に捉えられていない.
科学分野:
- エコロジー
- 気候科学
- リモートセンシング
背景:
- 気候変動は植物現象を変化させ,生態系の機能と気候フィードバックに影響を与えます.
- 北部の生態系では 温かい春が 成長期を早め 早期の生産性を高めます
- 春の暖かさによる後期の生産性への影響は観察されていますが,理解は不十分です.
研究 の 目的:
- 北部の生態系における 春の暖かさに対する 遅れた生産性の反応を分析する.
- 観測データを地球上の炭素循環モデル予測と比較する.
- 遅延効果の方向と分布を左右する要因を特定する.
主な方法:
- 1982年から2011年にかけての衛星,フィールドベース,モデルのデータを分析した.
- 生産性の遅延による不良と有益な影響を受けた面積の定量化
- 標高と降水量の影響を 統計的に分析する
主要な成果:
- 春の暖かさに対する生産性の遅延が 広く認められた.
- 観察データは,研究領域の約15%で有害な遅延効果と,約5%で有益な効果を示した.
- モデルでは,特に水ストレスによる有害な遅延効果を過小評価し,有益な効果を過大評価した.
結論:
- 北部の生態系の生産性に対する春の温暖化の遅延の影響は大きく,地理的に変動する.
- 季節的な水不足は 温泉の恩恵を相殺し モデルでは十分に反映されていない要因です
- 高度と降水パターンは,遅れた生産性の反応の重要な決定因子です.
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