地域循環型農業の可能性：都市周辺農業による輸入削減と環境影響の低減
Growing local and circular: The potential of peri-urban agriculture in reducing imports and environmental impacts (原題)
Arosemena JD, Toboso-Chavero S, Guinée J, Beltran AM, Villalba G
🤖 gxceed AI 要約
日本語
バルセロナ都市圏を対象に、都市周辺農業（UA）への循環型栄養戦略（堆肥、ストルバイト、剪定残渣）の導入をLCAで評価。地元産の循環型作物は輸入品より炭素足跡が12〜74%低く、剪定残渣は土壌炭素貯留により処理排出を相殺。しかし、ストルバイト等の化学集約的回収は淡水富栄養化や水消費を増加させる。都市の年間需要に対する足跡削減は最大37%だが、輸入依存度の高い作物では4%未満。地元産の露地トマトやピーマンなど、輸入品より本質的に優れた作物と組み合わせる重要性を示す。
English
Using Barcelona as a case study, this LCA explores circular nutrient strategies (compost, struvite, pruning residues) for peri-urban agriculture. Local circular crops show 12-74% lower carbon footprints than imports, with pruning residues offsetting treatment emissions via soil carbon storage. However, struvite recovery increases freshwater eutrophication and water use. Scaling to annual urban demand yields footprint reductions up to 37% for high self-sufficiency crops, but below 4% for import-dominated ones. Pairing circular strategies with intrinsically superior local crops maximizes environmental gains.
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、食料自給率向上と地域循環共生圏の構築が政策課題であり、都市近郊農業の環境便益を定量化する本手法は、自治体の食料・環境政策や企業のサプライチェーン排出削減に示唆を与える。特に、廃棄物由来の肥料利用は、Scope 3排出削減や循環経済移行に貢献し得る。
In the global GX context
This study contributes to global discourse on circular economy and sustainable food systems, offering a quantitative framework for assessing the environmental benefits of local food production. It aligns with ISSB/CSRD disclosure trends by providing life-cycle data that can inform Scope 3 reporting and transition planning for food companies. The findings underscore the need to integrate circular strategies with crop selection to maximize climate benefits.
👥 読者別の含意
🔬研究者:Provides a comprehensive LCA framework for evaluating circular nutrient strategies in urban agriculture, with detailed impact categories and scaling analysis.
🏢実務担当者:Offers actionable insights for urban planners and food companies on how to optimize local sourcing and nutrient recycling to reduce carbon footprints.
🏛政策担当者:Highlights the potential and limitations of peri-urban agriculture for import substitution and environmental impact reduction, informing urban food policy.
📄 Abstract（原文）
<title>Abstract</title> <p>While urban and peri-urban agriculture (UA) enhances food self-sufficiency, its environmental benefits depend on reducing reliance on long supply chains and synthetic inputs. Fertilizing UA with recovered municipal waste nutrients and pruning residues can replace mineral fertilizers, mitigate production impacts, and restore soil health. We explore these circular nutrient strategies (CNS) —compost, struvite and ammonium salts from wastewater, and pruning residues —using a cradle-to-market-gate life cycle assessment to compare local and conventionally imported crops and assess their contribution to lowering the environmental footprint of meeting annual urban crop demand. Using the Metropolitan Area of Barcelona as a case study, we estimate an overall fruit and vegetable self-sufficiency of 7%, with local production supplying 47,000 tonnes of annual demand. Fertilization-related processes shaped life-cycle burdens, accounted for 17–99% in local systems and 3–99% in imports, dominating marine eutrophication and contributed substantially to water consumption (WC) and local climate change. Local circular crops nonetheless had 12–74% lower carbon footprints than imports, with pruning-residue application providing enough soil carbon storage to offset treatment emissions. CNS costs include higher freshwater eutrophication (FE), WC, and mineral resource scarcity (MRS) from chemical-intensive struvite and ammonium salts recovery, and higher FE and MRS from pruning-residue shredding. Scaling to annual urban demand showed footprint reductions up to 37% for crops with higher self-sufficiency, but below 4% for import-dominated crops. UA must therefore pair CNS with crops that intrinsically outperform imported counterparts—like local open-field tomatoes and peppers—to maximize the environmental gains from displacing imports.</p>
🔗 Provenance — このレコードを発見したソース
- Research Square https://doi.org/10.21203/rs.3.rs-10546230/v1first seen 2026-09-02 04:34:29 · last seen 2026-09-05 04:48:29
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