Resilience of soil to biological invasion: analysis of spread on networks

Wilfred Otten*, Dmitri Grinev, Francisco Perez-Reche, Franco Neri, Luciano da Costa, Marcel Biana, Chris Gilligan, Sergei Taraskin

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    A network model for soil pore volume is presented and applied to the analysis of biological invasion of microorganisms. The pore geometry of two soils with a relatively high or low bulk density were quantified with the use of X-ray tomography and networks were constructed to present the pore space by channels connecting intersecting points. This network was subsequently quantified by the measurement of biologically relevant parameters, such as the distribution of lengths of the links between two nodes, the coordination number of the nodes, and the distribution of the sizes of the links between two nodes. Spread of microorganisms was subsequently considered as a function of these characteristics and embedded into a simple epidemiological model for spread that can be mapped onto percolation theory. We found that the networks display critical behaviour for biological invasions with a greater resilience to invasion for the more densely packed soil. We also found that inherent heterogeneity of soil systems further contributes to resilience to invasion.
    Original languageEnglish
    Title of host publicationProceedings of the 19th World Congress of Soil Science
    Subtitle of host publicationSoil Solutions for a Changing World, Brisbane, Australia 1-6 August 2010
    EditorsRobert Gilkes, Nattaporn Prakongkep
    Place of PublicationBrisbane
    PublisherInternational Union of Soil Sciences (IUSS)
    Pages68-71
    Number of pages4
    ISBN (Print)9780646537832, 9781618391025
    Publication statusPublished - Aug 2010
    Event19th World Congress of Soil Science 2010: Soil Solutions for a Changing World - Brisbane, Australia
    Duration: 1 Aug 20106 Aug 2010
    Conference number: 19

    Other

    Other19th World Congress of Soil Science 2010
    Country/TerritoryAustralia
    CityBrisbane
    Period1/08/106/08/10

    Keywords

    • X-ray tomography
    • Percolation
    • Micro-organisms
    • Epidemiological models
    • Soil structure
    • Modelling

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