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Báo cáo lâm nghiệp: "Diagnosing plant water status as a tool for quantifying water stress on a regional basis in Mediterranean drylands"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Diagnosing plant water status as a tool for quantifying water stress on a regional basis in Mediterranean drylands. | 113 Ann. For. Sci. 58 2001 113-125 INRA EDP Sciences 2001 Original article Diagnosing plant water status as a tool for quantifying water stress on a regional basis in Mediterranean drylands Moreno Vertoveca Serdal Sakẹalib Munir Ozturkb Sebastiano Salleoa Paola Giacomicha Enrico Feolia Andrea Nardinia a Dipartimento di Biologia Università degli Studi di Trieste Via L. Giorgieri 10 34127 Trieste Italy b Department of Biology Fatih University Buyukcekmece 34900 Istanbul Turkey Received 17 May 2000 accepted 24 August 2000 Abstract - This study reports measurements of stomatal conductance relative water content and water potential TL from three dominant evergreens Ceratonia siliqua L. Quercus coccifera L. and Olea oleaster Hoffmgg. et Link growing in four coastal sites of Turkey. In particular a fully vegetated site H was selected and compared for the above parameters to three degraded sites D1 D2 and D3 with decreasing vegetation covers. From the integral of the diurnal time course of T L the water stress impact on each species WSIS was calculated. C. siliqua and Q. coccifera showed similar WSIS s increasing significantly from H to D3. O. oleaster was sensitive both to summer drought and to increasing site degradation. The impact of water stress was scaled up from the species to the vegetation level WSIV as WSIV E WSISs 1-fs where fs was the relative frequency of the species studied. WSIV was rather sensitive to the impoverishment of vegetation and was correlated to vegetation density as estimated both by field observations and remotely sensed Normalized Difference Vegetation Index. desertification leaf water potential Mediterranean evergreens Normalized Difference Vegetation Index water stress impact Résumé - Diagnostiquer l etat de l eau dans la plante un outil pour quantifier le stress hydrique au niveau regional dans les regions sèches méditerranéennes. Cette étude rapporte les mesures de conductance stomatique de la teneur relative en eau et du potentiel hydrique