Climate Change Across Seasons Experiment (CCASE) at the Hubbard Brook Experimental Forest: Branch Xylem Water Isotopic Composition

Natural abundance stable isotopes of oxygen, hydrogen, and
deuterium-excess in branch xylem water were measured within the
Climate Change Across Seasons Experiment (CCASE) plots. There are six
plots total (each 11 x 14 m). Two are warmed 5 degrees C throughout
the growing season (Plots 3 and 4). Two others are warmed 5 degrees C
in the growing season and have snow removed during winter to induce
soil freezing and then warming cables turn on to create thaws; each
soil freeze/thaw cycle includes 72-hours of soil freezing followed by
72-hours of thaw (Plots 5 and 6). Four kilometers (2.5 mi) of heating
cable are buried in the soil to warm these four plots. Two additional
plots serve as controls for our experiment (Plots 1 and 2). This data
set includes natural abundance stable isotopes of oxygen, hydrogen,
and deuterium-excess in branch xylem water from 2018. These data were gathered as part of the Hubbard Brook Ecosystem Study
(HBES). The HBES is a collaborative effort at the Hubbard Brook
Experimental Forest, which is operated and maintained by the USDA
Forest Service, Northern Research Station.