低インプット高多様性草原バイオマスからの炭素負のバイオ燃料
David Tilman1, Jason Hill, Clarence Lehman
1Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN 55108, USA. tilman@umn.edu
まとめ
低投入高多様性 (LIHD) の原生草原バイオ燃料は,従来の選択肢と比較して優れたエネルギー収量と温室効果ガスの削減を提供します. これらの持続可能なバイオ燃料は,炭素マイナスであり,食品生産や生物多様性に影響を与えることなく,劣化した土地で栽培することができます.
科学分野:
- 農業科学 農業科学とは
- 環境科学 環境科学
- エネルギー科学 エネルギー科学
背景:
- トウモロコシエタノールや大豆バイオディーゼルなどの従来のバイオ燃料は,エネルギー効率,環境影響,土地利用の制限に直面しています.
- 原生草原の生態系は,農業化学の投入を削減した持続可能なバイオ燃料生産の可能性を秘めています.
研究 の 目的:
- 低投入高多様性 (LIHD) の原生草原バイオ燃料のバイオエネルギー生産量,温室効果ガスバランス,および土地利用の影響を評価する.
- LIHDバイオ燃料を,トウモロコシや大豆などの従来のバイオ燃料の原料と比較する.
主な方法:
- 草原原生多年生植物の LIHD 混合物の栽培.
- 10年以上のバイオエネルギーの生産量の測定.
- 生態系における二酸化炭素捕獲の純量の定量化.
- バイオ燃料の生産中に排出される化石二酸化炭素の評価.
主要な成果:
- LIHDの草原は,バイオエネルギーの生産性が著しく高くなっており,10年後には単一栽培よりも238%高い生産性を達成しました.
- LIHDバイオ燃料は炭素陰性であり,生態系における純炭素捕獲量 (4.4 Mg CO2 ha-1 yr-1) は生産排出量 (0.32 Mg CO2 ha-1 yr-1) を超える.
- LIHDバイオ燃料の生産は,農業的に劣化した土地で実現可能である.
結論:
- LIHDの原生草原バイオ燃料は,従来のバイオ燃料に対する持続可能な,環境に有益な代替品です.
- これらのバイオ燃料は,利用可能なエネルギー生産を強化し,温室効果ガスの排出量を削減し,農業化学汚染を最小限に抑えます.
- LIHDバイオ燃料は,炭素ネガティビティをサポートし,食料生産や生息地の破壊との競争を避け,劣化した農業用地に適しています.
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