Cosmic exergy-based ecological assessment for farmland-dairy-biogas agroecosystems in North China

文献类型： 外文期刊

第一作者： Li, Geng

作者： Li, Geng;Ning, Tang-Yuan;Li, Zeng-Jia;Wang, De-Yun;Tian, Shen-Zhong;Hu, Heng-Yu

作者机构：

关键词： Cosmic exergy;Agroecosystem;Renewability;Sustainability;Waste management

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：9.297； 五年影响因子：9.444 ）

ISSN： 0959-6526

年卷期： 2017 年 159 卷

页码：

收录情况： SCI

摘要： This paper presents a comprehensive approach for evaluating agroecosystems based on an embodied cosmic exergy investigation. This novel methodology is applied to three distinctive systems: farmland-biogas (F-B), farmland-dairy (F-D) and farmland-dairy-biogas (F-D-B) systems. A comparison of renewability and sustainability among the F-B, F-D and F-D-B systems is conducted to demonstrate this framework. The results show that over 50% of the total cosmic exergy inputs for the F-D-B system can be ascribed to purchased and free renewable resources, which is much higher than the other two systems. The net present ecological value (NPEV) of the F-D-B system is approximately 6 times higher than that of the F-B and F-D systems. The sustainability of the F-D-B system is 2.76 and 2.08 times higher than that of the F-D and F-B systems, respectively. The economic benefit (EB) of the F-D-B system is the highest of all three systems. These results suggest that the F-D-B system is superior to the other two systems. This study contributes to providing a theoretical foundation for policy-making in the rural regions of China. (C) 2017 Elsevier Ltd. All rights reserved.

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