Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:"Water and bioelement fluxes in four Quercus pyrenaica forests. | Ann Sci For 1996 53 625-639 Elsevier INRA 625 Original article Water and bioelement fluxes in four Quercus pyrenaica forests along a pluviometric gradient G Moreno 1 JF Gallardo 1 K Schneider1 F Ingelmo 2 Instituto de Recursos Naturales y Agrobiología CSIC Apdo 257 Salamanca 37071 2 Institute Valenciano de Investigaciones Agrarias Moncada 46113 Valencia Spain Received 6 September 1994 accepted 19 July 1995 Summary Water and several bioelement balances were established for four Quercus pyrenaica forests along a pronounced pluviometric gradient located in the Sierra de Gata mountains central Spain to obtain information on the effect of rainfall on annual and summer evapotranspiration on nutrient leaching from the soils and on the evolution of fertility. There was a positive correlation between the annual evapotranspiration and the precipitation in the May-August period but not with annual precipitation. From all water fluxes within the ecosystems deep drainage represented the most important difference between plots. An excess of water in the soil is produced in winter resulting in nutrient leaching of the soil and a consequent loss of fertility which becomes greater as the pluviometry gradient increases. This was confirmed by the net balance of several bioelements the Cation Denudation Rate the Ca AI ratio and pH of the soil solution and canopy leaching values. water balance I nutrient balance I water consumption I soil fertility I Quercus pyrenaica Resume Flux d eau et de bioéléments dans quatre forets de Quercus pyrenaica le long d un gradient de precipitation. Les bilans d eau et de plusieurs nutriments ont été établis pour quatre écosystèmes de Quercus pyrenaica le long d un gradient pluviométrique important situé dans la Sierra de Gata centre de I Espagne afin d obtenir des informations sur I effet de la quantité de pluie sur I evapotranspiration annuelle et estivale le lessivage des nutriments et revolution de la fertilite des sols. Une correlation positive .
