6Zine E A, Bernier M C. Control of pressure-chamber andrehydration-time effects on pressure-volume determination ofwater relation parameters[J] .Can.Bot, 1993,(71):1009-1015.
7Redfield E B,Janusz J Z. Drought tolerance characteristics ofblack spruce seedlings in relation to sodium sulfate and sodiumchloride injury[J].Can.Bot,2002,(80):773-778.