Abstract
In two consecutive years and under different environmental conditions, leaf gas exchange, sap flow and trunk diameter were measured to estimate transpiration of grapevine. Daily maxima of sap flow were lower than estimations obtained by gas exchange measurements. Sap flow was delayed with regard to variation of irradiance. For irrigated plants the correlation between transpiration rates of single leaves as determined by gas exchange and instantaneous sap flow was high (r 2 =0.84). However, the correlation of sap flow with the total daily water consumption was even higher (r 2 =0.98) and close to 1:1. At various water states, leaf photosynthetic rate was also correlated with sap flow (r 2 =0.78); the correlation coefficient increased to r 2 =0.91 when the daily balance was compared. Plant growth, estimated from linear variable displacement transducers was closely related to the daily sap flow.
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