Trembling aspen (Populus tremuloides) water potentials from clones with varying aspect and understory composition

Description

Predawn and midday plant water potential measurements, collected on terminal twigs using a scholander-type pressure chamber (PMS Instruments, Corvallis, OR, USA). Measurements were collected from 1-3 canopy dominant or co-dominant raments in 12 mature trembling aspen ( Populus tremuloides ) near aspen's low elevation range edge in the San Juan National Forest in southwest Colorado, USA. Clones were either growing on north-facing (n=4) or south-facing slopes (n=8) and had either grassy understories (n=6) or shrubby understories dominated by Symphiocarpus albus (n=6). Measurements were collected in the early growing season (2010-06-23), in the mid growing season but prior to the onset of the summer monsoon (2010-07-16) or in the late growing season after the onset of the monsoon (2010-08-17). Data are published using the PSINet data submission template (https://psinetrcn.github.io/). This data is a portion of the data analyzed in: Anderegg LDL, Anderegg WRL, Abatzoglou J, Hausladen AM, Berry JA . 2013 . Drought characteristics role in widespread aspen forest mortality across Colorado, USA. Global Change Biology 19 : 1526 1537.

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