Data on plant water potential for seedlings of four Pyrenean tree species planted along an elevation gradient. The dataset contains three files: Biomass.txt: Data on plant biomass per fraction (leaf, stem and roots) 4 years after plantation. Included variables: - Piso (factor): elevational stage at which the seedling was planted. Two levels: montane (M) or subalpine (S) - Luz (factor): whether the seedling was plantes at a gap or in the understory. Two levels: gap (O) or understroy (T) - N (numeric): number of plant in that plot - Sp (factor): species. Four levels: BEPE (Betula pendula) / PISY (Pinus sylvestris) / PIUN (Pinus uncinata) / ABAL (Abies alba) - Planta (factor): code to identify uniquely each plant - File (factor): code to identify uniquely each plant - GLI (num): Global Light Index, the amount of irradiance that receives each seedling - Code (factor): code to identify uniquely each plant - PLB (numeric): total plant biomass (g) - LFB (numeric): leaf biomass (g) - STB (numeric): stem biomass (g) - RTB (numeric): root biomass (g) - LMF (numeric): leaf mass fraction (LFB/PLB) - SMF (numeric): stem mass fraction (STB/PLB) - RMF (numeric): root mass fraction (RTB/PLB) - SLA (numeric): specific leaf area - H (numeric): plant height (mm) - D (numeric): plant diameter at root collar (mm) - PB2 (numeric): total plant biomass without considering leaves (g) - SF2 (numeric): stem mass fraction without considering leaves (STB/PB2) - RF2 (numeric): root mass fraction without considering leaves (RTB/PB2) init_biomass.txt: for biomass at the moment of plantation - Piso (factor): elevational stage at which the seedling was planted. Two levels: montane (M) or subalpine (S) - N (numeric): number of plant - Sp (factor): species. Four levels: BEPE (Betula pendula) / PISY (Pinus sylvestris) / PIUN (Pinus uncinata) / ABAL (Abies alba) - Planta (factor): code to identify uniquely each plant - File (numeric): code to identify uniquely each plant - PB (numeric): total plant biomass (g) - LB (numeric): leaf biomass (g) - SB (numeric): stem biomass (g) - RB (numeric): root biomass (g) WaterPot.txt: data on plant water potential for seedlings of four Pyrenean tree species planted along an elevation gradient during a period of intense drought - Piso (factor): elevational stage at which the seedling was planted. Two levels: montane (M) or subalpine (S) - Luz (factor): whether the seedling was plantes at a gap or in the understory. Two levels: gap (O) or understroy (T) - N (numeric): number of plant - Parcela (factor): identifier ofthe plot - Sp (factor): species. Four levels: BEPE (Betula pendula) / PISY (Pinus sylvestris) / PIUN (Pinus uncinata) / ABAL (Abies alba) - Estacion (factor): the moment for the measurement. One level: September - GLI (numeric): global light index, the ration of total irradiance received by the plant at the moment of plantation - WPt (numeric): water potential (bars)