Evaluation of Polyethylene Mulching and Sugarcane Cultivar on Energy Inputs and Greenhouse Gas Emissions for Ethanol Production in a Temperate Climate
Evaluation of Polyethylene Mulching and Sugarcane Cultivar on Energy Inputs and Greenhouse Gas Emissions for Ethanol Production in a Temperate Climate
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DOI：
10.3390/en13174369
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发表时间：
2020-08
期刊：
影响因子：
3.2
通讯作者：
T. Nakashima;K. Ueno;E. Fujita;S. Ishikawa
中科院分区：
文献类型：
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作者：
T. Nakashima;K. Ueno;E. Fujita;S. Ishikawa
通过生命周期评估 (LCA) 估算了日本种子岛用于生物乙醇生产的甘蔗（Saccharum officinarum）种植和运输相关的化石能源投入和温室气体 (GHG) 排放。目的是了解聚乙烯覆盖处理（种植时覆盖和每次休耕时覆盖，MM；仅在种植时覆盖，MU；未经处理，即根本不覆盖，UU）和品种（耐寒基因型 NiTn18 和传统品种 NiF8）组合系统的效果。将覆盖物处理和栽培品种相结合，创建了六个栽培系统，用于对生物乙醇生产的从摇篮到大门的能源输入和排放进行比较评估。 LCA结果表明，MM/NiF8系统产生的能量输入和温室气体排放分别为6.29 MJ L−1和0.500 kg CO2e L−1，分别比UU/NiF8系统的相应值低14%和23%。相比之下，MU/NiF8系统略微增加了环境负荷。与 NiF8 相比，使用 NiTn18 显着提高了甘蔗性能和乙醇产量，UU、MU 和 MM 处理的能量输入分别减少至 5.38、5.24 和 5.55 MJ L−1，温室气体排放量分别减少至 0.473、0.450 和 0.441 kg CO2e L−1。系统之间的能量输入和温室气体排放相似，表明 NiTn18 系统比 NiF8 系统可以接受更灵活的覆盖处理。 UU/NiTn18系统产生的能量投入和温室气体排放分别比MM/NiF8系统低14%和5%，这表明通过选育耐寒品种有可能克服寒冷条件下甘蔗生产的障碍。
Fossil energy inputs and greenhouse gas (GHG) emissions associated with the cultivation and transport of sugarcane (Saccharum officinarum) for bioethanol production in Tanegashima, Japan, were estimated by life cycle assessment (LCA). The aim was to understand the effects of combined systems of polyethylene mulching treatment (mulching at planting and every ratooning, MM; mulching only at planting, MU; and untreated, i.e., no mulching at all, UU) and cultivar (a cold-tolerant genotype, NiTn18, and a conventional variety, NiF8). The mulch treatments and cultivars were combined to create six cultivation systems that were used to conduct a comparative assessment of cradle-to-gate energy inputs and emissions for bioethanol production. The LCA results showed that the energy inputs and GHG emissions resulting from the MM/NiF8 system were 6.29 MJ L−1 and 0.500 kg CO2e L−1, which were 14% and 23% lower, respectively, than the corresponding values in the UU/NiF8 system. In contrast, the MU/NiF8 system increased the environmental loads slightly. The use of NiTn18 improved sugarcane performance and ethanol yields substantially as compared with NiF8, reducing energy inputs to 5.38, 5.24, and 5.55 MJ L−1 and GHG emissions to 0.473, 0.450, and 0.441 kg CO2e L−1 for the UU, MU, and MM treatments, respectively. The energy inputs and GHG emissions were similar among the systems, indicating that more flexible mulching treatments might be acceptable in the NiTn18 systems than in the NiF8 systems. The energy inputs and GHG emissions resulting from the UU/NiTn18 system were 14% and 5% lower, respectively, than those of the MM/NiF8 system, suggesting that it may be possible to overcome the handicap of sugarcane production in cold conditions by breeding cold-tolerant cultivars.