Emergy analysis of a farm biogas project in China: A biophysical perspective of agricultural ecological engineering
Emergy analysis of a farm biogas project in China: A biophysical perspective of agricultural ecological engineering
复制标题
中国农场沼气工程的能值分析：农业生态工程的生物物理视角
DOI：
10.1016/j.cnsns.2009.06.001
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发表时间：
2010-05-01
影响因子：
3.9
通讯作者：
Cai, Z. F.
中科院分区：
文献类型：
--
作者：
Zhou, S. Y.;Zhang, B.;Cai, Z. F.
本文以一个典型的农业沼气工程为例，通过能值分析，从生物物理学的角度对农业生态工程进行了分析。能值分析从农业生态工程的生物物理学角度对农业生态工程进行了实证研究。探讨了以市场价值和能值货币价值表示的沼气工程经济效益和生态经济效益。通过计算可再生性（R%）、能值产出率（EYR）、环境负荷率（ELR）和环境可持续性指数（ESI）等相对能值指标，对沼气工程的环境负荷和当地可持续性进行评价。结果表明，与其他典型农业系统相比，农场沼气项目更依赖当地可再生资源投入，环境压力更小，可持续性更高。此外，整体评价和政策影响，更好地运行和管理的沼气项目。(C)2009 Elsevier B.V.保留所有权利。
This paper aims to present a biophysical understanding of the agricultural ecological engineering by emergy analysis for a farm biogas project in China as a representative case. Accounting for the resource inputs into and accumulation within the project, as well as the Outputs to the social system, emergy analysis provides an empirical study in the biophysical dimension of the agricultural ecological engineering. Economic benefits and ecological economic benefits of the farm biogas project indicated by market value and emergy monetary value are discussed, respectively. Relative emergy-based indices such as renewability (R%), emergy yield ratio (EYR), environmental load ratio (ELR) and environmental sustainability index (ESI) are calculated to evaluate the environmental load and local sustainability of the concerned biogas project. The results show that the farm biogas project has more reliance on the local renewable resources input, less environmental pressure and higher sustainability compared with other typical agricultural systems. In addition, holistic evaluation and its policy implications for better operation and management of the biogas project are presented. (C) 2009 Elsevier B.V. All rights reserved.