Zostera marina(コアマモ)藻場における炭素クレジットの課題
Hilary Kennedy1, Carmen Leiva-Dueñas2, Catherine E Lovelock3
1School of Ocean Sciences, Bangor University, Anglesey, Wales, United Kingdom.
The Science of the total environment
|January 10, 2026
まとめ
生物多様性と気候緩和に不可欠な海草藻場は、以前考えられていたよりも炭素を貯留していません。コアマモ藻場は重要ですが、炭素貯留量と蓄積率が低いため、炭素市場への組み込みに影響を与えます。
科学分野:
- 海洋生態学; 気候変動科学; 炭素隔離
背景:
- 海草藻場は、生物多様性と気候危機に対処するために不可欠です。それらは生物多様性のホットスポットであり、重要な炭素吸収源として認識されています。世界的な海草の減少は、保全と回復の努力を必要とします。
研究 の 目的:
- Zostera marina(コアマモ)藻場における炭素貯留と蓄積率を評価すること。コアマモ藻場の炭素市場への組み込みの可能性を評価すること。Posidonia oceanicaなどの他の海草種と比較してコアマモの炭素貯留を比較すること。
主な方法:
- 堆積物中の有機炭素(OC)ストックと炭素蓄積率(CAR)のレビュー。OC源と安定性(鉱物関連有機物 - MAOM)の分析。コアマモと他の海草種との比較分析。
主要な成果:
- コアマモ藻場は、Posidonia oceanicaと比較して、有機炭素(OC)ストックの中央値(40%)と炭素蓄積率(CAR)(50%)が著しく低いことが示されました。コアマモのCARの中央値は、IPCC Tier 1の海草の排出係数のわずか21%にすぎません。植生のある地域の60%では、OCストックは植生のない堆積物と有意な差がありませんでした。
結論:
- コアマモ藻場は、炭素貯留と蓄積が少ないため、炭素市場への組み込みの可能性が限られている可能性があります。空間的不均一性、種特性、炭素輸出がコアマモの炭素動態に影響を与えます。炭素隔離以外の生態系サービスは、回復プロジェクトで考慮されるべきです。
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