Sap Flow in Aleppo Pine in Greece in Relation to Sapwood Radial Gradient, Temporal and Climatic Variability

摘要: Research Highlights: The radial gradient of sap flux density (Js) and the effects climatic factors on flow Aleppo pine were assessed at different time scales in an eastern Mediterranean ecosystem to improve our understanding species water balance. Background Objectives: pine’s profile responses environmental parameters were, best knowledge, originating date from more arid planted forests. Information natural forests this region was lacking. Our objectives (a) determine species’ variability Js a diurnal seasonal basis under conditions, (b) scale up tree taking into account (c) over year variability. Materials Methods: monitored forest northern Greece with Granier’s method using sensors three sapwood depths (21, 51, 81 mm) during two periods differing particularly soil availability. Results: highest 21 mm depth, it declined increasing depth. A steeper deep observed drier conditions. same patterns maintained throughout year, but contribution inner autumn when lower recorded both study periods. Not studied would result c. 20.2–27.7 % overestimation total (Qs), irrespective On basis, VPD strongest determinant density, while larger temporal scale, effect content evident. At SWC > 20% responded positively solar radiation VPD, indicating decisive role availability region. Moreover, days 0.7 KPa, controlled variation flow. Conclusions: There is considerable fluctuation dynamics that should be taken addressing