Abstract
In the understorey layer of a beech forest on limestone the H 2 O gas exchange of the summergreen herb Mercurialis perennis was continuously studied in 1982, in 1983 the transpiration (Tr) of six plant species was alternatingly analysed: two spring geophytes, Allium ursinum and Arum maculatum, one wintergreen herb, Asarum mergreen herb, M. perennis, and two grasses, Hordelymus europaeus and Melica uniflora. In addition to the gas exchange the seasonal course of some climatic factors (photosynthetical active radiation (PAR), air temperature (T a ) saturation deficit of the air (SD)) and of the water potential of the leaves (θ L ) were measured. Applying multiple regression analyses an attempt was made to explain the variability of the daily H 2 O losses of the six plant species during their vegetation period referring to these exogeneous and endogeneous variables
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