Resin bags were placed at a severely burned site and an unburned site as previously determined by Shaver and Rocha (2011a, b). Sites are located within the southern section of the Anaktuvuk River Fire (ARF) scar approximately 37 km NW of Toolik Field Station in northern Alaska.

In 2019, mixed-bed ion exchange resin bags were used to assess soil nutrient concentrations. Resin bags were assembled by placing 10 ±  0.01g of mixed bed ion-exchange resin (Dowex Marathon MR-3, Product #428736) inside a nylon stocking and securing either end shut with a zip tie. Stockings were washed with 0.5M HCl before bags were assembled and assembled bags were soaked in 2M KCl overnight to remove any ions that may have attached to the resin during assembly. Bags were rinsed with deionized water prior to deployment to prevent site contamination. Completed bags were pressed flat and placed ~10 cm below the soil surface at both the burned and unburned site. Bags remained from July 18, 2019 until August 18, 2019. Upon removal, bags were rinsed with deionized water to remove lingering dirt and extracted using 20 mL of 2M KCl. The extracted solution was analyzed for NO3, NH4, PO4 ions and TFPA (Total Free Primary Amines) using colorimetry.

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.