Abstract: One year old branches of 25 years old Norway spruce are taken from middle layer of canopy,and their water parameters are measured in a pressure chamber electrically controlled at 15,20,25,30 and 35℃. Pressure-volume analysis indicates that high temperature will induce the decrease of π₀ and π_p values, and different temperature has little effect in ROWC_πp and RWC_πp. Similar results are obtained using Hammel's method of gradually increasing pressure without temperature control. Tests of water absorption by plant tissues under 5-30℃ show that the water absorbing capacity increases with increasing temperature.

Key words: Pressure-volume analysis, Temperature, Water parameter of plant, Water absorption of plant tissues, Picea abies