Stable_water_isotopes_2021

Soil and xylem samples were taken once in summer 2021 from all plots of quintets 3, 4, 6, 8 of the RTG2300 sites. We took stem cores at breast height from n=8 trees (1 core per tree) and 4 soil cores, each in the middle between a pair of trees. Soil cores were separated in 7 depth intervals. Water was extracted from all samples using cryogenic vacuum distillation and subsequently analyzed for the isotopic compositions of hydrogen and oxygen at the Center for Stable Isotope Research and Analysis (KOSI, Georg-August-University Göttingen, Germany), using a high temperature conversion analyzer (TC/EA, Thermo Electron Corporation, Bremen, Germany) coupled via a Con-Flo III interface to a Delta V Plus isotope ratio mass spectrometer (Thermo Electron Corporation, Bremen, Germany). Gravimetric water content was calculated from fresh and oven-dried (105°C) sample weight.