Modeling root water uptake in hydrological and climate models

From 30 September to 2 October 1999 a workshop was held in Gif-sur-Yvette, France. with the central objective to develop a research strategy for the n ext 3-5 years. aiming at a systematic description of root functioning, root ing depth, and root distribution for modeling root water uptake from local and regional to global scales. The goal was to link more closely the weathe r prediction and climate and hydrological models with ecological and plant physiological information in order to improve the understanding of the impa ct that root functioning has on the hydrological cycle at various scales. T he major outcome of the workshop was a number of recommendations, detailed at the end of this paper, on root water uptake parameterization and modelin g and on collection of root and soil hydraulic data.