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Life Cycle Greenhouse Gas Emissions of Water Hyacinth-Derived Biochar for Fuel and Soil Amendment Applications: Japanese Model Applied to Ethiopian Context

水草由来バイオ炭の燃料・土壌改良用途におけるライフサイクルGHG排出：日本モデルをエチオピア文脈に適用 (AI 翻訳)

Kaito Murakami, Yasunori Kikuchi, Norikazu Kumekawa, Shinjiro Sato

Sustainability📚 査読済 / ジャーナル2026-08-10#炭素会計Origin: JP対象セクター: agriculture
DOI: 10.3390/su18168169
原典: https://doi.org/10.3390/su18168169

🤖 gxceed AI 要約

日本語

本研究は、エチオピアのタナ湖で過剰繁殖する水草（ホテイアオイ）由来バイオ炭のライフサイクルGHG排出量を評価。燃料利用と土壌改良の2シナリオを比較し、土壌改良が炭素隔離により最大の削減効果を示した。日本のデータを適用しつつ、エチオピアの社会文脈での持続可能なバイオマス管理と気候変動緩和への示唆を提供する。

English

This study assesses life-cycle GHG emissions of biochar derived from water hyacinth in Ethiopia, comparing fuel and soil amendment uses. Soil amendment offers the greatest net reduction due to carbon sequestration. Using Japanese data adapted to Ethiopian context, it supports sustainable biomass management and climate mitigation.

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本ではバイオ炭の炭素隔離効果が注目され、J-クレジット制度での活用が進む。本研究はLCA手法を途上国に適用した事例として、日本のバイオ炭技術の国際展開やCDM/二国間クレジット制度への示唆を与える。

In the global GX context

Globally, biochar is recognized for carbon sequestration and soil health. This study provides a life-cycle perspective on biochar in a developing country context, relevant to climate mitigation strategies and sustainable biomass management, complementing TCFD/ISSB-aligned disclosure on value chain emissions.

👥 読者別の含意

🔬研究者:LCA手法とバイオ炭のGHG削減効果の定量評価を参考に、地域適用の課題を理解できる。

🏢実務担当者:バイオ炭事業の環境便益を評価し、カーボンクレジットやサステナビリティ報告に活用できる。

🏛政策担当者:途上国でのバイオマス管理と気候変動緩和の政策設計に有用なエビデンスを提供。

📄 Abstract（原文）

This study assesses life cycle greenhouse gas (GHG) emissions from water hyacinth (Pontederia crassipes; WH) biochar production and its subsequent use as fuel or soil amendment in Ethiopia. Overgrowth of WH in Lake Tana has created ecological and socioeconomic challenges, while the country continues to rely heavily on biomass fuels and imported chemical fertilizers. To address these issues, three scenarios were evaluated using a functional unit of 1 kg of dried WH: (Case 1) current practice of abandonment and decomposition; (Case 2) WH-derived biochar (WHB) used as household fuel; and (Case 3) WHB applied as a soil amendment. Experimental data from pyrolysis of WH and acacia, combined with background life cycle inventory data, were used to quantify GHG emissions across each value chain. Japanese WH and WHB were used for life cycle GHG evaluation and applied to Ethiopian social contexts due to biological resources restrictions. The results showed that Case 3 provided the greatest reduction in net GHG emissions due to long-term carbon sequestration in soil. Case 2 also reduced emissions through substitution of acacia charcoal by use of WHB for household fuel, though to a lesser extent. Sensitivity analyses highlighted the influence of transport distance and biochar yield on overall performance. These findings demonstrated the environmental advantages of integrating WHB into Ethiopia’s energy and agricultural systems, supporting sustainable biomass management and climate mitigation strategies.

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