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Emergy evaluation for decision-making in complex multifunctional farming systems.

Ana Margarida P Fonseca^1,2, Carlos A F Marques², Teresa Pinto-Correia¹

¹Research Group on Mediterranean Ecosystems and Landscapes / ICAAM - Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Universidade de Évora, Núcleo da Mitra, Ap. 94, 7002-554 Évora, Portugal, ext 4445).

Agricultural Systems

|April 13, 2019

Summary

This study compares economic and emergy accounting for montado farms. Emergy accounting better values natural resources, revealing economic methods undervalue environmental contributions to farming systems.

Keywords:

donor-based value emergy montado silvo-pastoral system nature’s work

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Area of Science:

Agroecology
Environmental Accounting
Resource Management

Background:

Montado farms in Southern Portugal rely on renewable resources.
Traditional economic evaluations may not fully capture environmental contributions.

Purpose of the Study:

Compare traditional economic and emergy evaluations for montado farms.
Assess how each method values natural resources and purchased inputs.
Propose a combined approach for comprehensive resource accounting.

Main Methods:

Applied economic and emergy evaluations to a case study montado farm.
Analyzed the valuation of local natural resources and purchased factors.
Compared the results of both accounting methods.

Main Results:

The montado farm's renewable component represents 27% of total social costs.
Economic accounting undervalues the contribution of natural resources.
Purchased factors and services are valued 3.5 times higher in economic terms than in emergy terms.

Conclusions:

Complementing economic accounting with emergy accounting offers a benchmark for evaluating environmental contributions in agriculture.
Emergy accounting incorporates external factors and the biophysical system's contributions, enhancing total economic value.
This integrated approach supports informed sustainable economic decisions and public policies.