Pedunculate oak ecophysiology in restricting growing conditions (hydromorphic soil) is studied through measurements on both tree productivity (Leaf Area Index, rooting densities, radial increment) and water consumption (sap flow, leaf water potential). A detailed description of the edaphic constraints as well as transpiration measurements of the herbaceous strata have been made. Besides the process description, the data will be used so as to propose some guidelines to forest managers dealing with oak stands in restricting sites.