This file contains point-frame measurements from a nitrogen (N), phosphorus (P) and N+P fertilization experiment established in the southern section of the 2007 Anaktuvuk River fire in 2016 at a severely burned site and an unburned site. Pin-vegetation contact was recorded using a 0.75 m2 frame with 41 evenly spaced pin-drop points. Data was collected once during the height of the growing season in 2016 (when fertilization began) 2017, 2018 and 2019. This data was used to measure the impact of fertilization and fire on community composition.
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Sites are located within the southern section of the Anaktuvuk River Fire (ARF) scar approximately 37 km NW of Toolik Field Station at a severely burned (68.99°N, 150.28°W) and unburned (68.93°N, 150.21°W) location established previously by Rocha and Shaver in 2008 (Rocha and Shaver 2011a, b). At both sites, a randomized block, factorial N and P fertilization experiment was established in 2016 (9 years post-fire). The experimental design consisted of 5 blocks each consisting of a control (CT), nitrogen (N), phosphorus (P), and nitrogen plus phosphorus (N+P) treatment. CT plots recieved no treatment, N plots received 5 g/m2 of NH4 as NH4Cl and 5 g/m2 of NO3 as NaNO3, P plots received 5 g/m2 of P as P2O5 and N+P plots received both of the N and P fertilizer treatment. Fertilizer amounts mimiced treatment amounts at the Arctic LTER sites at Toolik Lake. Each plot was 20 m2.
Point-frame measurments were recorded at peak of each growing season from 2016-2019. In short, hits were recorded using a point-intercept method. A 0.75 m2 frame containing 41 evenly spaced pin sampling points was placed 0.5 meters in from the middle of the southern edge of each plot and at a height above the canopy. A 4 mm-diameter, metal pin was dropped vertically through the canopy at each of the 41 sampling points and every vegetation-pin contact was recorded according to species and summed for each plot.
Detailed site descriptions are published in
Rocha, A.V. and G.R. Shaver, 2011, Ecological Applications, v21, pg 477 and Rocha, A.V. and G.R. Shaver, 2011, Global Change Biology, v17, pg 2831.
Version 1, August 2020: Initial release
Version 2, August 2020: Define acronyms