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Impacts on agriculture following the 1991 eruption of Vulcan Hudson, Patagonia: lessons for recovery

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  • Thomas Wilson
  • Jim Cole
  • Shane Cronin
  • Carol Stewart
  • David Johnston

Abstract

Large explosive eruptions have the potential to distribute heavy ashfalls across large areas, resulting in physical and chemical impacts on agriculture, and economic and psycho-social impacts on rural communities. This study investigates how affected agriculture and rural communities have adapted, absorbed and mitigated impacts following a range of ashfall thicknesses (>2 m–>1 mm) from the 12–15 August 1991 eruption of Vulcan Hudson, one of the largest eruptions of the twentieth century. An estimated 1 million livestock died after the eruption due to pasture burial by ashfall and ongoing suppression of vegetation recovery. Horticulturalists suffered ongoing damage to crops from wind-blown ash and changes to soil properties increased irrigation and cultivation requirements. Real or perceived impacts on human health and impacts on farm productivity from the ashfall resulted in evacuation of farms and small towns in the short term. Long-term farm abandonment occurred in areas of heavy ashfall (upper Ibáñez valley) and highly stressed farming systems, even where ashfall was relatively thin (>50 mm), such as the Argentine steppe. The mono-agricultural system of sheep farming in the steppe region had few options other than destocking, proving less resilient than the diverse high-intensity horticultural and pastoral mix in irrigated valleys, which allowed more rapid adaption through diversification of production. Farms with natural advantages and greater investment in capital improvements led to greater damage potential initially (at least in cost terms), but ultimately provided a greater capacity for response and recovery. Better soils, climate and significantly greater access to technological improvements such as cultivation tools, irrigation and wind breaks were advantageous, such as at Chile Chico (Chile), Los Antiguos and Perito Moreno (Argentina). Cultivation increased chemical and physical soil fertility, especially when used in combination with fertilisation and irrigation. Appropriate use of seeds and cropping techniques within the new soil and growing conditions was important. Government agencies had a vital role in the dissemination of information for appropriate farm management responses, ash chemistry analysis, evacuations and welfare, and in the longer term to provide technical and credit assistance to facilitate recovery. Copyright Springer Science+Business Media B.V. 2011

Suggested Citation

  • Thomas Wilson & Jim Cole & Shane Cronin & Carol Stewart & David Johnston, 2011. "Impacts on agriculture following the 1991 eruption of Vulcan Hudson, Patagonia: lessons for recovery," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 57(2), pages 185-212, May.
  • Handle: RePEc:spr:nathaz:v:57:y:2011:i:2:p:185-212
    DOI: 10.1007/s11069-010-9604-8
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    References listed on IDEAS

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    1. Thomas Wilson & James Cole, 2007. "Potential impact of ash eruptions on dairy farms from a study of the effects on a farm in eastern Bay of Plenty, New Zealand; implications for hazard mitigation," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 43(1), pages 103-128, October.
    2. James Boyce, 2000. "Let Them Eat Risk? Wealth, Rights, and Disaster Vulnerability," Working Papers wp4, Political Economy Research Institute, University of Massachusetts at Amherst.
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    Cited by:

    1. Victor Stephane, 2016. "How Do Natural Disasters Affect Saving Behavior?," Working Papers halshs-01409651, HAL.
    2. Johanna Choumert & Pascale Phelinas, 2018. "Volcanic hazards, land and labor," Working Papers halshs-01845041, HAL.

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