School of Environmental Science and Engineering, Tianjin University, Tianjin, China.
School of Environmental Science and Engineering, Tianjin University, Tianjin, China.
Sci Total Environ. 2018 Jun 1;625:1301-1308. doi: 10.1016/j.scitotenv.2018.01.030. Epub 2018 Jan 12.
The purpose of this paper is to provide an up-to-date bibliometric view about the current life cycle assessment (LCA) for bioenergy. The social network analysis (SNA) method was applied to study total 2367 publications in this field. The results showed the high frequency keywords related with the "LCA" for bioenergy included three categories: (1) Bioenergy production, such as "Biodiesel", "Bioethanol", "Biogas" and "Biorefinery"; (2) Environmental problems, such as "Greenhouse gas" (GHG), "Environmental impact", "Climate change"; (3) Environmental target: "Sustainability". This means that LCA methods have been widely used in assessing the environmental impact from various types of bioenergy production process. Specially, the "GHG" attracted more attention in this research area. According to the temporal trend of the high frequency keywords, "bioethanol" is the most significant hotspot keyword of implication LCA. However, it has become colder since 2011. The environmental performance of "biogas" and "land use" began to receive attention since 2015.The evolutionary co-words network showed that the boundary of hotspots became overlapped. We also found four clusters were identified from keywords networks, i.e. the biggest cluster Cluster (I) (central cluster node linkage was "Bioethanol-GHG"), followed by Cluster (II) (central cluster node linkage was "Biodiesel-Algae"), Cluster (III) (central cluster node linkage was "Biorefinery-Sustainability") and Cluster (IV) (central cluster node linkage was "Biogas-Anaerobic digestion"). This cluster analysis also showed that the implication of LCA for the relationship between "bioethanol" and "GHG" is the most important hotspot research field. Although "biogas" is the smallest cluster now, it could be the next important hotspot of implication LCA for bioenergy. This study provides an effective approach to obtain a general knowledge of the LCA for bioenergy and supports a deeper understanding of research directions in the future.
本文旨在提供当前生物能源生命周期评估（LCA）的最新文献计量视图。本文采用社会网络分析（SNA）方法研究了该领域的 2367 篇文献。结果表明，与“生物能源 LCA”相关的高频关键词可分为三类：（1）生物能源生产，如“生物柴油”、“生物乙醇”、“沼气”和“生物炼制”；（2）环境问题，如“温室气体”（GHG）、“环境影响”、“气候变化”；（3）环境目标：“可持续性”。这意味着 LCA 方法已广泛用于评估各种类型的生物能源生产过程的环境影响。特别是，“GHG”在该研究领域受到了更多关注。根据高频关键词的时间趋势，“生物乙醇”是最显著的 LCA 热点关键词。然而，自 2011 年以来，其热度逐渐降低。“沼气”和“土地利用”的环境性能自 2015 年开始受到关注。进化共词网络表明，热点之间的界限开始重叠。我们还从关键词网络中识别出四个聚类，即最大聚类（I）（中心聚类节点连接是“生物乙醇-GHG”），其次是聚类（II）（中心聚类节点连接是“生物柴油-藻类”），聚类（III）（中心聚类节点连接是“生物炼制-可持续性”）和聚类（IV）（中心聚类节点连接是“沼气-厌氧消化”）。该聚类分析还表明，LCA 对“生物乙醇”和“GHG”之间关系的暗示是最重要的热点研究领域。尽管“沼气”现在是最小的聚类，但它可能是生物能源 LCA 的下一个重要热点。本研究提供了一种获取生物能源 LCA 一般知识的有效方法，并支持对未来研究方向的更深入理解。
