银杏水分输导过程研究

Study on water transmitting process in Ginkgo biloba

用树干液流探针对银杏树干液流流速在标准日昼夜及阴天的变化过程进行了测定。结果表明：在标准日，6：00～9：00间，树干内不产生液流；9：00～11：00间，树干液流流速递增，并于11：00达到最大；13：00～15：00间，液流流速出现波动，15：00后液流流速下降，16：00～20：00间，液流流速平稳；20：00～22：00间，液流流速继续下降；22：00后树干内不再产生液流。阴天树干液流流速相对平稳，流速的峰值出现时间比晴天推迟约1．5h。银杏边材在晴天昼夜液流量分别为4．445L和0．8841L；阴天昼夜液流量分别为5．3341L和1．2891L。晴天树干昼夜液流量均小于阴天。

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.