期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 334, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2023.117478
关键词
Erosion mitigation; Cost-effectiveness analysis; Post -fire management; Mulching; Ecosystem services
Wildfires can have significant impacts on forest areas, causing hydrological and erosive responses that have environmental, human, cultural, and financial consequences. This study reviews the effectiveness and cost-effectiveness of post-fire soil erosion control measures, finding that treatments that provide a protective ground cover, such as agricultural straw mulch, are the most cost-effective.
Wildfires usually increase the hydrological and erosive response of forest areas, carrying high environmental, human, cultural, and financial on-and off-site effects. Post-fire soil erosion control measures have been proven effective at mitigating such responses, especially at the slope scale, but there is a knowledge gap as to how cost-effective these treatments are.In this work, we review the effectiveness of post-fire soil erosion mitigation treatments at reducing erosion rates over the first post-fire year and provide their application costs. This allowed assessing the treatments' cost-effectiveness (CE), expressed as the cost of preventing 1 Mg of soil loss. This assessment involved a total of 63 field study cases, extracted from 26 publications from the USA, Spain, Portugal, and Canada, and focused on the role of treatment types and materials, and countries.Treatments providing a protective ground cover showed the best median CE (895 $ Mg-1), especially agri-cultural straw mulch (309 $ Mg -1), followed by wood-residue mulch (940 $ Mg -1) and hydromulch (2332 $ Mg -1). Barriers showed a relatively low CE (1386 $ Mg -1), due to their reduced effectiveness and elevated implementation costs. Seeding showed a good CE (260 $ Mg -1), but this reflected its low costs rather than its effectiveness to reduce soil erosion.The present results confirmed that post-fire soil erosion mitigation treatments are cost-effective as long as they are applied in areas where the post-fire erosion rates exceed the tolerable erosion rate thresholds (>1 Mg -1 ha- 1 y-1) and are less costly than the loss of on-and off-site values that they are targeted to protect. For this reason, the proper assessment of post-fire soil erosion risk is vital to ensure that the available financial, human and material resources are applied appropriately.
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