Climate Change Across Seasons Experiment (CCASE) at the Hubbard Brook Experimental Root Nitrogen Uptake Capacity

Fine root nitrogen uptake capacity was measured on excised roots prior
to experimental treatment in 2013 and throughout the growing seasons
of 2014 and 2015 on all Climate Change Across Seasons Experiment
(CCASE) plots. Reference (or control) plots are shared with the
collaborating Northern Forest DroughtNet experiment. There are six
plots total (each 11 x 14m). 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
freeze/thaw cycles (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). Analysis and results from these data are presented in Sanders-DeMott
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. Sanders-DeMott, R., Sorensen, P.O., Reinmann, A.B. et al. Growing
season warming and winter freeze–thaw cycles reduce root nitrogen
uptake capacity and increase soil solution nitrogen in a northern
forest ecosystem. Biogeochemistry 137, 337–349 (2018).
https://doi.org/10.1007/s10533-018-0422-5