Estimation of hydraulic conductance within field-grown apricot using sap flow measurements

摘要: Using the heat pulse and other techniques, hydraulic architecture of apricot trees was mapped out. The flows (overall flow, flow across four main branches) forces (water potential differences between xylem leaves) measured allowed us to quantify conductance branches root/soil resistance. experiment carried out in a commercial orchard 11-year-old (Prunus armeniaca L., cv. Bulida, on Real Fino rootstock) during 1 week (October 27–November 3, 1998). Three representative with cylindrical trunk divided into different sizes, orientation local microclimate were chosen for experiment. Sap throughout experimental period. Twelve sets heat-pulse probes used, one each branch. diurnal course environmental conditions, fraction area irradiated leaf water relations also considered relationships potential, transpiration established total plant. slopes these regressions, plant conductance, stem root pathway, canopy branch estimated. Our findings show that are similar magnitude. Leaf per unit orientations, indicating that, while light has dominant influence transpiration, this case it had little effect properties canopy.