caa a22 4500 477109462 CHVBK 20180405111604.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF00010456 doi (NATIONALLICENCE)springer-10.1007/BF00010456 Sellin Arne Department of Botany and Ecology, University of Tartu, Lai 40, EE 2400, Tartu, Estonia aut Base water potential of Picea abies as a characteristic of the soil water status [Elektronische Daten] [Arne Sellin] Variation in base water potential (Ψb, a daily maximum level of plant water potential, which is presumed to correspond to the condition of equilibrium between the soil and plant water potentials) was examined in shoots of Norway spruce trees growing in well-drained and waterlogged soils. The influence of soil water content, air temperature, and vapour pressure deficit of the atmosphere on Ψb was studied using the pressure chamber technique. Maximum daily water potentials were not always observable before dawn; some were registered up to two hours later. This tendency being characteristic of trees growing under stress (shade, waterlogging) conditions, increased with declining soil water availability. In trees growing in well-drained soil, Ψb depended asymptotically on the available soil water storage (R2=0.73), while the values were slightly influenced by vapour pressure deficit of the atmosphere as well. In trees growing in waterlogged soil, Ψb was independent of the soil water storage, but sensitive to the vapour pressure deficit. Kluwer Academic Publishers, 1996 air temperature nationallicence base water potential nationallicence Picea abies nationallicence pressure chamber nationallicence soil water content nationallicence vapour pressure deficit nationallicence Ψ : bulk water potential (MPa) nationallicence Ψb : base water potential (MPa) nationallicence Ta : air temperature (°C) nationallicence VPD : vapour pressure deficit of the atmosphere (kPa) nationallicence Plant and Soil Kluwer Academic Publishers; gopher://gopher:wkap.nl 184/2(1996-06-01), 273-280 0032-079X 184:2<273 1996 184 11104 https://doi.org/10.1007/BF00010456 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00010456 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Sellin Arne Department of Botany and Ecology, University of Tartu, Lai 40, EE 2400, Tartu, Estonia aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher:wkap.nl/ 184/2(1996-06-01), 273-280 0032-079X 184:2<273 1996 184 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer