Torres-García et al. 2020_AJB_Ecophysiological data of the phreatophyte Ziziphus lotus
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Data for the phreatophytic shrub <em>Ziziphus lotus</em> (L.) Lam (Rhamnaceae) in a grounwater-dependent ecosystem of semiarid regions (southeastern Spain). Stable hydrogen (δ<sup>2</sup>H) and oxygen (δ<sup>18</sup>O) isotopes to find out which is the dominant water source for the plants. Carbon stable isotope composition of leaves (δ<sup>13</sup>C) as a ecological indicator of plants function. Predawn (<em>Ψ</em><sub>pd</sub>) and midday (<em>Ψ</em><sub>md</sub>) water potentials to characterize the species on an isohydric–anisohydric continuum. Folar gas-exchange rates and nutrient concentrations to evaluate plants’ response to increasing water stress along a depth-to-groundwater (DTGW) gradient. For further description of the methods, please see Torres-García et al., 2021. Squandering water in drylands. <em>Am. J. Bot.</em> DOI: 10.1002/ajb2.1606
