都市道路の落葉の価値化：都市サステナビリティに向けたバイオ炭生産の炭素隔離ポテンシャル

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

🔬研究者:都市廃棄物由来バイオ炭の炭素隔離ポテンシャル評価手法とLBCS指標の提案が参考になる。

🏢実務担当者:都市緑地管理や廃棄物リサイクル事業における炭素クレジット創出の可能性を検討する材料になる。

🏛政策担当者:都市レベルでのネガティブエミッション技術導入とクレジット制度設計の参考事例として有用。

Carbon sequestration and emission reduction via biochar represent a promising approach for carbon storage. Continuously collected roadway fallen leaves serve as an attractive precursor for biochar-based carbon sequestration. However, the realistic carbon sequestration potential (derived from biochar production) of these urban waste resources remains poorly quantified and deserves further investigation. Against the backdrop of global sustainability goals, this study estimated the potential of using roadway fallen leaves for carbon sequestration at the urban scale of Hangzhou, based on government reports and pyrolysis experiments. Results indicated that there were a total of 691,472 roadway trees in Hangzhou. If the fallen leaves of the roadway trees in Hangzhou were subjected to oxygen-limited pyrolysis at a temperature of 300 °C for carbon sequestration purposes, the potential total carbon sequestration capacity was estimated to be 2273 ± 55 tons of carbon, equivalent to 8334 ± 200 tons of carbon dioxide. Leaf-derived biochar carbon sequestration index (LBCS) was established for potential use in the future Certified Emission Reduction (CCER). Different leaf types and pyrolysis conditions correspond to different LBCS values. LBCS for Camphor tree (300 °C) was 3.64 kg C·tree−1·year−1. Thermal maps of carbon sequestration potential of roadside leaf resources in 13 counties and districts of Hangzhou made by this study provided a reference for potential future practices. It was further estimated that with one-third of the tree leaves used for leaf-derived biochar (300 °C) carbon sequestration between 2027 and 2060, the cumulative carbon sequestration potential could reach up to 18.96 billion tons CO2-eq by 2060, contributing 29–68% of the global GHGs emission reduction goal for bioenergy with carbon capture and storage (BECCS). We noted that this long-term cumulative estimate relied on linear extrapolation assumptions and contained uncertainties. This research offered new insights and quantitative baseline data for advancing negative-carbon technology using urban leaf waste, supporting local waste recycling practices and the urban implementation of the United Nations 2030 Agenda toward carbon-neutrality objectives.

• openalex https://doi.org/10.3390/su18179130first seen 2026-09-11 05:09:39