tailieunhanh - Báo cáo lâm nghiệp: Evapotranspiration of a declining Quercus robur (L.) stand from 1999 to 2001. II. Daily actual evapotranspiration and soil water reserve

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: "Evapotranspiration of a declining Quercus robur (L.) stand from 1999 to 2001. II. Daily actual evapotranspiration and soil water reserve" | Ann. For. Sci. 62 2005 615-623 INRA EDP Sciences 2005 DOI forest 2005060 615 Original article Evapotranspiration of a declining Quercus robur L. stand from 1999 to 2001. II. Daily actual evapotranspiration and soil water reserve Caroline VINCKEa André GRANIERb Nathalie BREDAb Freddy DEVILLEZa a Unité des Eaux et Forêts Faculté d ingénierie biologique agronomique et environnementale Université Catholique de Louvain Croix du Sud 2 9 1348 Louvain-la-Neuve Belgium b Équipe bioclimatologie-Ecophysiologie INRA Centre de recherches de Nancy 54280 Champenoux France Received 15 November 2004 accepted 2 March 2005 Abstract - The components of actual evapotranspiration ET - interception In tree transpiration T and forest floor ET - were measured from 1999 to 2001 in a mixed stand dominated by declining pedunculate oaks. Sap flux density measurements oaks and maple and forest floor ET 38 were extrapolated to season and stand scales by regressions with potential evapotranspiration PET and leaf area index LAI . Stand ET varies between 383 and 594 mm ET PET . Oak transpiration 21-38 of stand transpiration is lower than forest floor ET forest floor can therefore not be neglected in this stand water balance. The soil water reserve dynamics deduced from those measurements reflects the inter-annual changes of water use. No water stress have been calculated on the 1999-2001 period but it is suspected to have occurred previously together with soil constraints and caterpillar defoliation it could in part explain the severe oak decline symptoms. transpiration evapotranspiration Quercus robur L. forest decline soil water reserve Résumé - Evapotranspiration d un peuplement de chêne pédonculé Quercus robur L. dépérissant de 1999 à 2001. II. Evapotranspiration réelle et réserve en eau du sol journalieres. Les composantes de l évapotranspiration réelle ETR - interception In transpiration T des arbres et évapotranspiration du sous-étage herbacé - ont été mesurées de 1999 à .