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    © 2015, Springer-Verlag Berlin Heidelberg.Snowfall provides the majority of soil water in certain ecosystems of North America. We tested the hypothesis that snow depth variation affects soil water content, which in turn drives water potential and photosynthesis, over 10 years for two widespread shrubs of the western USA. Stem Ψ and photosynthetic gas exchange [stomatal conductance to water vapor, and CO2 assimilation ] were measured in mid-June each year from 2004 to 2013 for Artemisia tridentat…Read more