为了给林木合理灌溉提供生理学的依据,我组结合不同灌溉处理,对大田栽培的加拿大杨、洋槐当年生苗(截干)、臭椿二年生苗的叶子,进行了水份生理指标的测定。测定的主要指标为细胞汁浓液,共测定方法如下:将采下的叶片冰冻8小时以上,然后取出,解冻后压出细胞汁,用折光仪测定其浓度(含干物 In order to provide rational physiological basis for forest irrigation, we combined with different irrigation treatments and measured the physiological indexes of water in Canadian poplar and acacia cultivated in field. The main indicators of determination of cell juice concentrate, were measured as follows: The leaves were taken frozen more than 8 hours, and then removed, thawed out of the cell juice, with a refractometer to determine the concentration (including dry matter