Abstract: The radial variation of sap flow in Ligustrum lucidum Ait trunk and the relationship with meteorological factors was analyzed based on the data,which has been monitored sap flow at 10mm,20mm,30mm Ligustrum lucidum Ait trunk by TDP(Thermal Dissipation Sapwood Flow Velocity Probe) method from May to October,2010 in Xiaolangdi ecological station,Henan province.The results showed that the average sap flow velocity of Ligustrum lucidum Ait changed as "low-high-low" during growing season on the south and north of the tree,Fs_20>Fs_30>Fs_10.The trends of average sap flow velocity at three depth were basically the same on south and north in different months.June>July>August>September>October>May for south and July>June>August>September>October>May for north.The sap flow velocity in three typical was Fs_10>Fs_20>Fs_30 in spring,Fs_20>Fs_30>Fs_10 in summer and autumn.The starting time of sap flow was Fs_10>Fs_20>Fs_30,the pausing time was Fs_30>Fs_20>Fs_10 during growing season.The closer point was to cambium,the earlier the sap flow started and the later paused.The trends of sap flow velocity in daily and seasonal variability were all similar at different depths.The sap flow velocity at different depths showed sharp-peak,wide-peak,double peaks curves in spring,summer and autumn respectively in sunny days,and all showed multi-peak curves in cloudy days.The starting time of sap flow in summer was earlier than that in spring and autumn,and the pausing time was later than that in spring and autumn.Therefore,the peak duration of sap flow in summer was longer than that spring and autumn,and the curve was wider than that in spring and autumn.

Key words: Ligustrum lucidum Ait, Ligustrum lucidum Ait, Sap flow, Radial variation