Abstract: Five Hippophae rhamnoides varieties of (Liaofu1,Liaofu2,Chuyi,Xiangyang,andAlieyi) seedlings were selected for an research object in semi-arid area,Fuxin of Liaoning province,China.Some parameters of water physiological Characteristics of different Hippophae rhamnoides varieties were observed and analysed.The results showed that,during the whole growth season,the leaf water content of the varieties of Hippophae rhamnoides had little change,rangng from 63.60 percent to 72.04 percent;the hydraulic potential change ranges from -0.4 MPa to-0.8MPa,and the regular pattern representation that the higher in the morning and in the dusk,then the lower in the noon;the change range of the stomatal conductance is from 0.16μmolH₂O/m²·Sto 0.42μmolH₂O/m²·S,and the tendency representation was bimodal curve;the change range of the water metabolize coefficient is from 0.992to 1.307; the time of ability of leaf water maintaining is from twenty-eight hours to thirty hours;the change range of the water use efficiency is from 0.964 to 1.587. According to the analysis on the parameters,of the five varieties of Hippophae rhamnoides,the drought resistance of Chuyi was the strongest,Xiangyang andAlieyi were in the middle and Liaofu1 and Liaofu2 were weaker than others.

Key words: Hippophae rhamnoides, water physiology, drought resistance