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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Emergy-based sustainability assessment of an integrated production system of cattle, biogas, and greenhouse vegetables: Insight into the comprehensive utilization of wastes on a large-scale farm in Northwest China
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Emergy-based sustainability assessment of an integrated production system of cattle, biogas, and greenhouse vegetables: Insight into the comprehensive utilization of wastes on a large-scale farm in Northwest China

机译：基于能值的可持续性牛，沼气和温室蔬菜综合生产系统的可持续性评估：深入了解西北地区大型农场的废物综合利用

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摘要

Based on the concept of comprehensive utilization of wastes, an eco-agricultural integrated production system of cattle, biogas, and greenhouse vegetables (IPSCBV) was constructed for a large-scale farm in Northwest China. In the present study, the production efficiency, environmental impact, economic viability, and sustainability of the IPSCBV were evaluated using emergy and economic analyses. The performance of the IPSCBV was compared with that of independent production systems for cattle and greenhouse vegetables using a variety of emergy indices, including the joint indices (transformity, emergy yield ratio, environmental loading ratio, and emergy sustainable index) calculated for the IPSCBV with multiple outputs and the weighted average indices for the independent production systems. The self-organization ability, emergy exchange status, and economic and environmental benefits of the integrated and independent production systems were evaluated using the feedback ratio of yield (FYR), emergy exchange ratio (EER), and greenhouse gases emission mitigation intensity (GEMI). The evaluation results using the new emergy-based indices showed that the IPSCBV had better emergy efficiency and higher sustainability, which resulted in less environmental stress than the independent production systems for cattle and greenhouse vegetables. The FYR of the IPSCBV system was 10.50% while that of the independent systems was only 0%. The GEMI in the IPSCBV reached 2.12 kg CO2-eq/10~(14) sej. The EER of the IPSCBV (0.62) was significantly lower than that of the independent greenhouse vegetable production system (3.02). That is, the price of the products underestimated their real (emergy-based) value which includes the free environmental resources and the system's inherent feedbacks. From an economic point of view, the IPSCBV may not provide a competitive economic input-output ratio in the short run. However, it serves as a promising eco-agricultural model for comprehensive utilization of wastes on large-scale farms associated with intensive management because of its better performance with respect to resource utilization, environmental emission mitigation, and sustainability.
机译：基于废物综合利用的概念，为西北地区的一个大型农场建立了牛，沼气和温室蔬菜的生态农业综合生产系统（IPSCBV）。在本研究中，使用能值和经济分析评估了IPSCBV的生产效率，环境影响，经济可行性和可持续性。使用多种能值指标，将IPSCBV的性能与独立的牛和温室蔬菜生产系统的性能进行比较，包括为IPSCBV计算的联合指标（转化率，能效产率，环境负荷率和能效可持续指标）。独立生产系统的多个输出和加权平均指数。使用产量（FYR），能值交换比（EER）和温室气体排放缓解强度（GEMI）的反馈比，评估了集成和独立生产系统的自组织能力，能值交换状态以及经济和环境效益。 。使用新的基于能值的指数进行的评估结果表明，IPSCBV的能值效率更高，可持续性更高，与独立的牛和温室蔬菜生产系统相比，其环境压力较小。 IPSCBV系统的FYR为10.50％，而独立系统的FYR只有0％。 IPSCBV中的GEMI达到2.12 kg CO2-eq / 10〜（14）sej。 IPSCBV的EER（0.62）明显低于独立温室蔬菜生产系统的EER（3.02）。也就是说，产品的价格低估了其实际（基于能值）的价值，其中包括免费的环境资源和系统的固有反馈。从经济角度来看，IPSCBV短期内可能无法提供有竞争力的经济投入产出比。然而，由于它在资源利用，减少环境排放和可持续性方面表现更好，因此它是与集约化管理相关的大型农场废物综合利用的有希望的生态农业模式。

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