Water relations of adult Norway spruce (Picea abies (L) Karst) under soil drought in the Vosges mountains: water potential, stomatal conductance and transpiration P Lu, P Biron, N Bréda and A GranierAnn. For. Sci., 52 2 (1995) 117-129DOI: https://doi.org/10.1051/forest:19950203