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Accueil du site → Doctorat → Allemagne → 2021 → Long-term Multifunctionality across Mediterranean-type ecosystems : Improving Restoration Outcomes through trait-based Modelling

Freie Universität Berlin (2021)

Long-term Multifunctionality across Mediterranean-type ecosystems : Improving Restoration Outcomes through trait-based Modelling

Fiedler, Sebastian

Titre : Long-term Multifunctionality across Mediterranean-type ecosystems : Improving Restoration Outcomes through trait-based Modelling

Auteur : Fiedler, Sebastian

Université de soutenance : Freie Universität Berlin

Grade : Doctor rerum naturalium (Dr. rer. nat.) 2021

Résumé partiel
Mediterranean-type ecosystems (MTEs) are among the global biodiversity hotspots most vulnerable to multiple factors of global change, such as climate warming and elevated atmospheric CO2. Global change is likely to exacerbate current ecosystem degradation in MTEs, with severe consequences for the long-term provision of multiple ecosystem services on which people depend, such as carbon sequestration, water and nutrient supply. Ecological restoration is increasingly aimed at counteracting the decline and improving the long-term provision of multiple ecosystem services. For successful restoration, however, ecologists require a fundamental understanding of the link between vegetation composition, related functions and services, and influencing environmental factors. Measurable traits of plant species such as specific leaf area have been recognized as a quantifiable link between vegetation composition and ecosystem functions underlying ecosystem services. Given this link, restoration can select plant species based on their traits in order to improve desired ecosystem functions. In this thesis, I aimed at assessing the linkage between plant traits and the provision of multiple ecosystem functions, as well as trade-offs among these functions under the influence of multiple changing environmental factors, to support the restoration of degraded MTEs towards multifunctionality world-wide. Through a literature review, I found that current trait-based research lacks a complete understanding of the combined effects of multiple environmental factors on the long-term provision of multiple ecosystem functions and a quantification of the trade-offs and synergies among these factors. To address this gap, I proposed a theoretical framework that complements trait-based empirical research with process-based simulation modelling. Based on this framework, I successfully developed the individual- and trait-based simulation model ModEST (Modelling Ecosystem Services and Functions based on Traits) that calculates the coupled dynamics of soil water, soil nutrients, and individual woody plants characterized by traits. ModEST allows quantification of ecosystem functions for a given planted trait composition over time under varying environmental conditions

Mots clés  : Ecology Cheetah Human Wildlife Conflict GPS Spatial

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Page publiée le 18 novembre 2021