Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Allemagne → 2015 → An investigation into the Kobresia pygmaea ecotone of the Tibetan Plateau - from species to community ecology

Martin-Luther-Universität Halle-Wittenberg (2015)

An investigation into the Kobresia pygmaea ecotone of the Tibetan Plateau - from species to community ecology

Seeber, Elke

Titre : An investigation into the Kobresia pygmaea ecotone of the Tibetan Plateau - from species to community ecology

Auteur : Seeber, Elke

Université de soutenance : Martin-Luther-Universität Halle-Wittenberg

Grade : Doktorgrades der Naturwissenschaften (Dr. rer. nat.) 2015

Résumé
Alpine ecosystems are important for global carbon cycles but are vulnerable to changes in land-use and environment. The Tibetan Plateau hosts the largest alpine range with 450,000 km2 being covered by Kobresia pastures. The six studies within this dissertation investigate the biology of the key species Kobresia pygmaea as well as factors influencing this ecosystem. The studies show that K. pygmaea is tetraploid. The species spreads by clonal growth and gains high levels of genetic diversity, although germination rates are low. The trade-off between clonal and sexual reproduction as well as biomass production is influenced by grazing and environmental conditions. The ecosystem stores huge amounts of carbon within the belowground biomass and soils. After grazing exclusion, carbon pools decreased in montane pastures. This thesis emphasizes the importance of the Kobresia ecosystem and its degradation would have severe consequences on global carbon cycles and therefore the global climate

Présentation

Version intégrale (1,2 Mb)

Page publiée le 23 mai 2021