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Infrastructural landscape fragmentation versus occlusion: A sensitivity analysis

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  • Ledda, Antonio
  • De Montis, Andrea

Abstract

Landscape fragmentation, i.e. the process where large habitat patches become smaller and more isolated, has often been accelerated by human activities, such as deforestation, agricultural land conversion, and urbanisation of natural areas. Transport and mobility infrastructures are a major cause of landscape fragmentation. The Infrastructural Fragmentation Index is a common measure of landscape fragmentation due to transport and mobility infrastructures and depends, inter alia, on the occlusion coefficient, which accounts for the obstruction to movement. The values of this coefficient mirror well-established conditions, which depend on type of transport and mobility infrastructure and traffic flow. Lack of data affects its values and generates uncertainty in the measurement of landscape fragmentation. In this study, we develop on a sensitivity analysis, by assessing how IFI varies when the occlusion coefficient changes in the case of six landscape units in Sardinia (Italy) and Andalusia (Spain). Our results demonstrate that the IFI is very sensitive to the elimination of national, provincial, and local roads. Thus, we advance that, as the uncertainty cannot be eliminated, the most efficient strategy to reduce these biases is to dismiss the absolute values of IFI and adopt difference-based expressions.

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  • Ledda, Antonio & De Montis, Andrea, 2019. "Infrastructural landscape fragmentation versus occlusion: A sensitivity analysis," Land Use Policy, Elsevier, vol. 83(C), pages 523-531.
    • Handle: RePEc:eee:lauspo:v:83:y:2019:i:c:p:523-531
    DOI: 10.1016/j.landusepol.2019.02.035
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    References listed on IDEAS

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    4. De Montis, Andrea & Ledda, Antonio & Ortega, Emilio & Martín, Belén & Serra, Vittorio, 2018. "Landscape planning and defragmentation measures: an assessment of costs and critical issues," Land Use Policy, Elsevier, vol. 72(C), pages 313-324.
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    Cited by:

    1. Julio Plaza Tabasco & Héctor S. Martínez Sánchez-Mateos, 2021. "Integration Versus Fragmentation, the Role of Minor Rural Networks in Rural Cultural Landscapes. A Study-Case in Spain," Sustainability, MDPI, vol. 13(9), pages 1-20, April.
    2. Chi, Yuan & Liu, Dahai & Wang, Jing & Wang, Enkang, 2020. "Human negative, positive, and net influences on an estuarine area with intensive human activity based on land covers and ecological indices: An empirical study in Chongming Island, China," Land Use Policy, Elsevier, vol. 99(C).
    3. Manuel Sánchez-Fernández & Juan Miguel Barrigón Morillas & David Montes González & José Juan de Sanjosé Blasco, 2022. "Impact of Roads on Environmental Protected Areas: Analysis and Comparison of Metrics for Assessing Habitat Fragmentation," Land, MDPI, vol. 11(10), pages 1-20, October.
    4. Antonio Ledda & Vittorio Serra & Andrea De Montis, 2019. "The Effect of Rural Buildings on Landscape Fragmentation in Natura 2000 Sites: A Case Study in Sardinia," Sustainability, MDPI, vol. 11(17), pages 1-18, August.

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