降雨量の変化が草原の窒素循環における世界的な不平等を悪化させる
Miao Zheng1,2,3, Jinglan Cui1,2,3, Xiaoxi Wang4,5,6
1State Key Laboratory of Soil Pollution Control and Safety, Zhejiang University, Hangzhou, China.
Nature communications
|August 23, 2025
まとめ
草原の窒素循環は 気候変動によって変化し 生産性にも影響を及ぼしています 適応戦略は悪影響を軽減し,窒素の収穫を強化し,経済的価値を確保することができます.
科学分野:
- エコロジー
- 環境科学
- 生地化学
背景:
- 草原は地球最大の地上の生態系であり,生地化学的サイクルを通じて生態系サービスに不可欠です.
- 気候の変化,特に降雨パターンの変化は,これらのサイクルを乱し,草原の生産性を制限します.
研究 の 目的:
- 草原における世界の窒素摂取量,収穫量,余剰量の変化を予測する.
- この窒素循環の変化における地域格差を評価する.
- 適応措置の可能性を評価する.
主な方法:
- 2944の実験観察の合成
- 複数の生態系モデルを統合する
- 気候変動の影響に関するシナリオ分析
主要な成果:
- 全世界の窒素の供給量,収穫量,余剰量はそれぞれ年間100万トン,700万トン,300万トン増加すると予測されています.
- いくつかの地域 (例えば米国,アジア) での降雨の増加と,他の地域 (例えばサハラ以南のアフリカ) での降雨減少により,顕著な地域格差が存在します.
- 適応措置により,窒素の供給量と余剰量を1年あたり12Tgと22Tg削減し,収穫量を1年あたり10Tg増加させることができる.
結論:
- 気候変化による降雨の変化は,草原の窒素動態に大きな地域的変動をもたらします.
- 草原の窒素循環を管理し,生産性を高め,大きな経済的損失を回避するには,積極的な適応戦略が不可欠です.
- 適応措置の実施により,窒素の投入と余剰を大幅に削減し,収穫を増加させ,持続可能な草原管理への道を開くことができます.
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