In a montado farm, commonly found in the South Portugal, human activities benefit from important fluxes of renewable resources. In this study, traditional economic and emergy evaluations are compared to determine their potential contributions to understanding this complex system and applied to a case study of a farm. This allows us to determine how each method values local natural resources and purchased factors of production and services in an empirical context. Results show that the montado farm has a renewable component evaluated at 27% of the total social costs of the system and that the work of natural resources is undervalued in economic budget accounting. Economic evaluation's relative value of purchased factors and services is three and half times higher than their emergy share. We propose that complementing economic budget accounting with emergy accounting provides a benchmark to evaluate the environmental contribution to agricultural and farming systems. In this way, factors external to markets can be evaluated for farming systems, bringing to economic analysis a full evaluation of resources, including the bio-geophysical system's contributions to wealth, enlarging total economic value of resources with a donor perspective enabling a better informed and comprehensive accounting to attain sustainable economic decisions and public policies.

中文翻译：

---

复杂多功能农业系统决策的能值评估

在葡萄牙南部常见的 montado 农场中，人类活动受益于重要的可再生资源。在这项研究中，比较传统的经济和能值评估，以确定它们对理解这个复杂系统的潜在贡献，并将其应用于农场的案例研究。这使我们能够在经验背景下确定每种方法如何评估当地自然资源以及购买的生产和服务要素。结果表明，montado 农场的可再生成分被评估为系统总社会成本的 27%，并且自然资源的工作在经济预算核算中被低估了。经济评价中购买要素和服务的相对价值是其能值份额的三倍半。我们建议用能值会计补充经济预算会计为评估环境对农业和耕作系统的贡献提供了一个基准。通过这种方式，可以评估农业系统的市场外部因素，使经济分析对资源进行全面评估，包括生物地球物理系统对财富的贡献，从捐助者的角度扩大资源的总经济价值，从而能够更好地了解和综合会计，以实现可持续的经济决策和公共政策。