Betula nana shrubs' annual growth ring widths measurements from Toolik Lake moist tussock tundra 1977-2016

The dataset consists of tundra shrubs - Betula nana annual growth ring widths measurements after cross-dating. In the current database there are 24 growth curves taken from 11 shrubs, representing an arithmetic mean of three to four radial measurements of rings widths performed within each cross-section. Cross-sections represents both below-ground (roots) and above-ground (main shoot & stem) plant parts. The measurements are presented in microns. NA values represent outermost missing rings, values '1' represents missing rings detected at the cross-dating procedure. Shrubs were collected in summer 2014, 2015 and 2016 in a moist tussock tundra habitat (control site), 880 m SSW from Toolik Field Station. The data are under current development, more extensive serial sectioning is on-going. The data are unpublished, so please contact Agata Buchwal in any matter of data use.