tailieunhanh - Báo cáo lâm nghiệp: "Evapotranspiration of a declining Quercus robur (L.) stand from 1999 to 2001. I. Trees and forest floor daily transpiration"

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. I. Trees and forest floor daily transpiration" | Ann. For. Sci. 62 2005 503-512 INRA EDP Sciences 2005 DOI forest 2005055 503 Original article Evapotranspiration of a declining Quercus robur L. stand from 1999 to 2001. I. Trees and forest floor daily transpiration Caroline ViNCKEa Nathalie BREDAb André GRANiERb 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-Écophysiologie. INRA-Centre de recherches de Nancy 54280 Champenoux France Received 15 November 2004 accepted 2 March 2005 Abstract - Water use of a Quercus robur L. declining stand was estimated from 1999 to 2001 by measuring independently tree canopy and herb layer transpiration. Two plots differing in density were compared. Oak daily sap flux density kinetic is well synchronised with potential evapotranspiration PET daily time course. Despite differences in density stand structure and LAI spatial organisation oak transpiration T mm d-1 is quite the same between plots. The declining trees are very responsive to the PET fluctuations but their daily response is low T 1 mm d-1 T PET . A combination of soil constraints and low disorganised LAI could induce this low transpiration capability. According to its phenology density and the above canopy closure the herbaceous layer contributes to at least the same but often more water consumption than the oak up to mm d-1 . Therefore it cannot be neglected in water balance calculations. sap flux tree transpiration herbaceous transpiration LAI oak decline Résumé - Evapotranspiration d un peuplement de chêne pédonculé Quercus robur L. dépérissant de 1999 à 2001. I. Transpiration journaliere des arbres et de la strate herbacée. L utilisation de l eau par un peuplement de chênes dépérissant Q. roburL. a été estimée de 1999 à 2001 par des mesures indépendantes de transpiration des arbres et de transpiration de la strate herbacée. Deux parcelles .

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