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Published online by Cambridge University Press: 04 August 2010
SUMMARY
The spatial and temporal variation of heat pulse velocity was investigated in a 150- year-old beech tree (Fagus sylvatica L.). High correlation was found between heat pulse velocity and water vapour saturation deficit of the air (84%) and photosynthetic photon flux density (together 85%). No additional influence of temperature and wind speed could be detected.
INTRODUCTION
The water budget of trees is linked to the water potential gradient between soil and atmosphere. Transpiration of a tree crown depends on stomatal conductivity, radiation, air temperature, water vapour saturation deficit of the air and wind speed. Variations are influenced by the soil water potential, the conducting tissues, the root system and the amount of leaves. The base of the trunk is the optimal place to measure transpiration of a whole tree assuming that storage is negligible.
The intention of this research work was to complement a programme of gas exchange measurements by heat pulse velocity measurements. The spatial and temporal variation of heat pulse velocity was investigated in a single tree. The correlation between heat pulse velocity and weather conditions during the vegetation period was analysed.
MATERIALS AND METHODS
The determinations were carried out on a single beech tree growing in a beech stand (Luzulo-Fagetum) which has been intensively investigated during the last 20 years (Bl research area of the IBP, International Biological Programme, “Solling-Projekt”, Germany; Ellenberg, Mayer & Schauermann, 1986).
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