Data from: Centennial-scale reductions in nitrogen availability in temperate forests of the United States
McLauchlan, K. K., Kansas State University
Gerhart, L. M., Kansas State University
Battles, J. J., University of California, Berkeley
Craine, J. M., Jonah Ventures, LLC, Manhattan, USA
Elmore, A. J., University of Maryland, College Park
Higuera, P. E., University of Montana
Mack, M. C., University of Arizona
McNeil, B. E., West Virginia University
Nelson, D. M., University of Maryland, College Park
Pederson, N., Harvard University
Perakis, S. S., United States Geological Survey
Published Aug 14, 2017 on Dryad.
Cite this dataset
McLauchlan, K. K. et al. (2017). Data from: Centennial-scale reductions in nitrogen availability in temperate forests of the United States [Dataset]. Dryad. https://doi.org/10.5061/dryad.q6p50
Forests cover 30% of the terrestrial Earth surface and are a major component of the global carbon
(C) cycle. Humans have doubled the amount of global reactive nitrogen (N), increasing deposition of
N onto forests worldwide. However, other global changes—especially climate change and elevated
atmospheric carbon dioxide concentrations—are increasing demand for N, the element limiting primary
productivity in temperate forests, which could be reducing N availability. To determine the long-term,
integrated effects of global changes on forest N cycling, we measured stable N isotopes in wood, a
proxy for N supply relative to demand, on large spatial and temporal scales across the continental U.S.A.
Here, we show that forest N availability has generally declined across much of the U.S. since at least
1850 C.E. with cool, wet forests demonstrating the greatest declines. Across sites, recent trajectories
of N availability were independent of recent atmospheric N deposition rates, implying a minor role for
modern N deposition on the trajectory of N status of North American forests. Our results demonstrate
that current trends of global changes are likely to be consistent with forest oligotrophication into the
foreseeable future, further constraining forest C fixation and potentially storage.
master data file
Site level data
Basal Area Index data for trees from tree rings
R code for running analyses. Includes analyses and plots. Will output to pdf and output text file.