LLEIDA, SPAIN — Our lab performs isotopic water analysis with a Picarro L2120-i analyzer. Our principal application using the Picarro analyzer is the isotopic analysis of xylem water to identify variations in water source during its uptake from the soil. This is based on the fact that there is an evaporation gradient in the soil and as a result, water obtained from distinct depths has a distinct isotopic signal. We are using this principle in distinct contexts to resolve various questions...