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The Impacts of Climate Change on Continental Ecosystems


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SEGUIN Bernard

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The Impacts of Climate Change on Continental Ecosystems

Climate change will deeply modify the ecophysiological functioningof plants, by creating a set of conditions which could be more favourable (in the sense of biomass production) or not. Among the first, the increase ofatmospheric CO2 will stimulate the photosynthesis (with levels depending upon plants and conditions), with a result of a potential increase in biomass up to 20 % in some cases. Warmer temperatures will also generally be favourable to most of the physiological processes, up to an optimum above which the risk of detrimental or lethal values exists. The (almost) generalized advance in phenology (calendar of development stages) will also have various effects: sometimes increase the risk of spring frost or bad setting forfruit trees, a reduced duration cycle for annual plants but an increased active vegetation season for perennial species (advance in spring occurrence, delay for autumn), positive or negative feedback in terms of the active temperature for the vegetal. Above all, the availability of water will be the key factor for modulating the changes in potential production. The changes in individual behaviour will evidently affect plant communities, which however will also to face changes in their geographical zones of potentialities. They can be approached in terms of potential shift by considering their bioclimatic envelope, but there is a large controversy on this approach in regard of possible biotic interactions. It would be also necessary to consider other components of continental ecosystems like insects and pests, or animals in the case of natural ecosystems, as well as future interactions with human intervention. These general notions will be mainly illustrated by examples in crop and forestry productions, with some complementary details about natural ecosystems.

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    Date de réalisation : 8 Novembre 2008
    Lieu de réalisation : IGeSA - Institut de Gestion Sociale des Armées, Porquerolles, France
    Durée du programme : 28 min
    Classification Dewey : Économie, Sciences de la Terre
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    Catégorie : Conférences
    Niveau : niveau Doctorat (LMD), Recherche
    Disciplines : Géodynamique externe - climatologie
    Collections : New Methodologies and Interdisciplinary Approaches in Global Change Research
    ficheLom : Voir la fiche LOM
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    Auteur(s) : SEGUIN Bernard
    producteur : FMSH-ESCoM
    Réalisateur(s) : FILLON Richard, DESLIS Jirasri
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    Langue : Anglais
    Mots-clés : économie, Science de la Terre, Géoscience
    Conditions d’utilisation / Copyright : Tous droits réservés.
 

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