Hannes is interested in the study of below ground water competition and physiological differences in hydraulic traits and fluxes of tropical lianas and trees. His fieldwork focuses on extensive stable water isotope experiments (both enriched and natural abundance) and sapflow measurements performed in the tropical forest of French Guyana. The resulting new insights are brought together in a plant hydraulic transport model which includes root uptake, water storage and dynamic stomatal conductance optimization, aiming to improve our understanding of the physiological mechanisms that cause the different hydraulic strategies of both growth forms.

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