Soil organic carbon change can reduce the climate benefits of biofuel produced from forest residues
Soil organic carbon change can reduce the climate benefits of biofuel produced from forest residues
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DOI：
10.1016/j.joule.2023.12.018
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发表时间：
2024-01
期刊：
影响因子：
39.8
通讯作者：
Kai Lan;Bingquan Zhang;Tessa Lee;Yuan Yao
中科院分区：
文献类型：
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作者：
Kai Lan;Bingquan Zhang;Tessa Lee;Yuan Yao
由于生物质残留物不会引起土地利用的变化，土壤碳的变化通常不考虑在生命周期评估（LCA）的生物燃料来自森林残留物通过监管机构。在这里，我们调查的影响，土壤有机碳（SOC）的变化所造成的森林残留物在美国南部的生物燃料的碳强度。我们发现，100年来SOC变化的平均温室气体（GHG）排放量为8.8-14.9 gCO 2 e MJ-1，占生物燃料生命周期GHG排放量的20.3%-65.9%。这些SOC相关的温室气体排放因时间框架、场地条件和森林管理策略而异。就土地管理而言，将森林残留物转化为生物燃料比在陆地上腐烂或堆烧更有利于气候，这取决于化石燃料的替代和场地条件。我们的研究结果强调，即使在使用森林残留物且不涉及土地利用变化的情况下，也需要将土壤碳评估纳入生物燃料LCA、政策制定和森林管理。
Because biomass residues do not cause land-use change, soil carbon changes are commonly not considered in life cycle assessments (LCAs) of biofuel derived from forest residues adopted by regulatory agencies. Here, we investigate the impacts of soil organic carbon (SOC) changes caused by removing forest residues in the Southern US on the carbon intensity of biofuels. We show that the average greenhouse gas (GHG) emissions by SOC changes over 100 years are 8.8–14.9 gCO2e MJ−1, accounting for 20.3%–65.9% of life cycle GHG emissions of biofuel. These SOC-associated GHG emissions vary by time frame, site conditions, and forest management strategies. For land management, converting forest residues to biofuel is more climate beneficial than on-land decay or pile burning, depending on fossil fuel substitution and site conditions. Our results highlight the need to include soil carbon assessment in biofuel LCAs, policymaking, and forest management, even when forest residues are used and no land-use change is involved.