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Assessing the roles of crops and livestock in nutrient circularity and use efficiency in the agri-food-waste system: A set of indicators applied to an isolated tropical island
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2022-09-24 , DOI: 10.1016/j.resconrec.2022.106663
Vivien Kleinpeter, Manon Alvanitakis, Mathieu Vigne, Tom Wassenaar, Danny Lo Seen, Jonathan Vayssières

Increasing nutrient circularity and use efficiency is a leading topic in the search for more sustainable agri-food-waste systems (AFWS). This paper proposes a method to assess the role of crops and livestock in nutrient circularity and use efficiency in an AFWS. The method is based on the analysis of nutrient flows, a detailed typology of flows, and a set of 3 groups of indicators to characterize (i) circularity between sub-systems, (ii) the process efficiency of the sub-systems and (iii) the efficiency of the AFWS. The method is illustrated using the nitrogen metabolism of the AFWS of a tropical Island, French Reunion Island. The island's current nitrogen use efficiency is very low (0.7%). Crops and livestock are major sources of inefficiencies due to their processes, they account for respectively, 42% and 9% of total AFWS inefficiency. However, crops and livestock are involved in circularity, as they play, respectively, a recycling receiver and recycling supplier role. Among the internal recycling routes between all sub-systems, 41% go to crops and 31% come from livestock. The paper argues that circularity and process efficiency are not objectives per se but means to achieve AFWS efficiency, and that the distinction between these three elements enable a systemic multi-level understanding of the roles of crops and livestock.



中文翻译:

评估农作物和牲畜在农业食品废物系统中营养循环和利用效率中的作用:应用于一个孤立的热带岛屿的一组指标

提高养分循环和利用效率是寻找更可持续的农业食品废物系统 (AFWS) 的主要话题。本文提出了一种评估农作物和牲畜在 AFWS 养分循环和利用效率中的作用的方法。该方法基于对养分流动的分析、详细的流动类型和一组 3 组指标来表征 (i) 子系统之间的循环性,(ii) 子系统的过程效率和 (iii) ) AFWS 的效率。该方法使用热带岛屿法国留尼汪岛的 AFWS 的氮代谢进行说明。该岛目前的氮利用效率非常低(0.7%)。作物和牲畜因其工艺而成为效率低下的主要来源,它们分别占 AFWS 总效率低下的 42% 和 9%。然而,作物和牲畜参与循环,因为它们分别扮演回收接收者和回收供应商的角色。在所有子系统之间的内部回收路线中,41% 用于作物,31% 来自牲畜。该论文认为循环性和流程效率不是目标本身但意味着实现 AFWS 效率,并且这三个要素之间的区别能够对作物和牲畜的作用进行系统的多层次理解。

更新日期:2022-09-24
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