In new-cultivated oasis,by taking main tree species(Populus russkii Jabl.) of backbone shelterbelt as the research object.Under A and B irrigation treatments,simultaneous monitoring stem sap flow,shoots water potential and photosynthetic characteristics,and combined with the data of meteorological factors,analysis and comparison the water physiological characteristics of the P.russkii Jabl.under the 2 kinds of irrigation treatments.The results showed that: Compare with A,B treatment,the stem sap flow speed ...