Differentiating Arctic PFTs based on root nitrogen acquisition.

In July, 2013, we injected a 15N tracer into the rooting zone at three targeted depth intervals (organic layer, mineral soil, and the permafrost boundary) in order to characterize nitrogen acquisition for species representing three important plant functional types (PFTs) on the Barrow Ecological Observatory near Utquiagvik (formerly Barrow), AK.

The amount of nitrogen acquired from different depths throughout the soil profile is being used to refine definitions of PFTs in arctic models. 

Publications.

Zhu Q, Iversen CM, Riley WJ, Slette IJ, Vander Stel HM. 2017. Root traits explain observed tundra vegetation nitrogen uptake patterns: Implications for trait-based land modelsJournal of Geophysical Research: Biogeosciences 121: 3101-3112.

Related Publications.

Song X, Hoffman FM, Iversen CM, Yin Y, Kumar J, Ma C, Xu X. 2017. Significant inconsistency of vegetation carbon density in CMIP5 Earth System Models against observational dataJournal of Geophysical Research – Biogeosciences 122: 2282-2297.

Wullschleger SD, Epstein HE, Box EO, Euskirchen ES, Goswami S, Iversen CM, Kattge J, Norby RJ, van Bodegom PM, Xu X. 2014. Plant functional types in Earth System Models: Past experiences and future directions for application of dynamic vegetation models in high-latitude ecosystemsAnnals of Botany 114: 1-16..

Data Sets.

This research is funded by the Office of Biological and Environmental Research in the U.S. Department of Energy’s Office of Science.

Related projects.

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