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Long-term implications of water erosion in olive-growing areas in southern Spain arising from a model-based integrated assessment at hillside scale

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  • Ibáñez, Javier
  • Martínez-Valderrama, Jaime
  • Taguas, Encarnación V.
  • Gómez, José A.

Abstract

In this paper, a model-based integrated assessment of the long-term consequences of water erosion in four olive groves with different conditions in Andalusia (southern Spain) is carried out. The assessment is based on a system dynamics model built at hillside scale. The modelling approach tackles common difficulties arising from the relative scarcity of data and the uncertainty of the long term. On the one hand, model results have allowed characterising the nonlinear dynamics of water erosion. On the other, they have showed that positive gross margins may definitively vanish after around 100years in some olive-growing areas. In spite of this, the adoption by farmers of soil conservation practices is limited. The assessment shows that the loss of yields due to the erosion-caused reduction in soil water availability lead to annual economic losses ranging between 1 and 2.8€ha−1yr−1 in the studied rainfed orchards. These losses are completely obscured by the normal fluctuations in economic and production variables, so that they do not give farmers adequate warning of the consequences of non-sustainable soil management.

Suggested Citation

  • Ibáñez, Javier & Martínez-Valderrama, Jaime & Taguas, Encarnación V. & Gómez, José A., 2014. "Long-term implications of water erosion in olive-growing areas in southern Spain arising from a model-based integrated assessment at hillside scale," Agricultural Systems, Elsevier, vol. 127(C), pages 70-80.
    • Handle: RePEc:eee:agisys:v:127:y:2014:i:c:p:70-80
    DOI: 10.1016/j.agsy.2014.01.006
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    References listed on IDEAS

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    1. Ibáñez, Javier & Valderrama, Jaime Martínez & Puigdefábregas, Juan, 2008. "Assessing overexploitation in Mediterranean aquifers using system stability condition analysis," Ecological Modelling, Elsevier, vol. 218(3), pages 260-266.
    2. Nelson, R.A. & Dimes, J.P. & Paningbatan, E.P. & Silburn, D.M., 1998. "Erosion/productivity modelling of maize farming in the Philippine uplands: Part I: parameterising the Agricultural Production Systems Simulator," Agricultural Systems, Elsevier, vol. 58(2), pages 129-146, October.
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    Cited by:

    1. Salmoral, Gloria & Garrido, Alberto, 2015. "The Common Agricultural Policy as a driver of water quality changes: the case of the Guadalquivir River Basin (southern Spain)," Bio-based and Applied Economics Journal, Italian Association of Agricultural and Applied Economics (AIEAA), vol. 4(2), pages 1-21, August.
    2. Jaime Martínez-Valderrama & Emilio Guirado & Fernando T. Maestre, 2020. "Unraveling Misunderstandings about Desertification: The Paradoxical Case of the Tabernas-Sorbas Basin in Southeast Spain," Land, MDPI, vol. 9(8), pages 1-12, August.

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