| The velocity of sap flow in the trunk of Ginkgo biloba has been gauged by TDP probes in standard day and cloudy day.The results indicated there was no sap flow during 6∶00~9∶00 and after 22∶00;the velocity of sap flow increased gradually until reached the peak value during 9∶00~11∶00, fluctuated during 13∶00~15∶00,dropped after 15:00,became stable during 16∶00~20∶00,dropped again during 20∶00~22∶00 in the standard day.In the cloudy day,the velocity of sap flow was relatively stable and the peak value appeared 1.5 hours later than that in the sunny day.The flow in the trunk of Ginkgo biloba was 4.445 L and 0.8841 L during the daytime and the night respectively in the sunny day,and 5.334 L and 1.289 L during the daytime and the night respectively in the cloudy day.The flow in the trunk of Ginkgo biloba during the sunny day was less than that in the cloudy day. |