Resin strips were placed in the intertussock spaces at a severely burned site and an unburned site (see  Shaver and Rocha 2011a, b for site description). 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 2016, plant-available N and P was assessed using ion-exchange membranes (GE Power and Water, via Maltz sales: anion model #3009749; cation model #3009753) cut into 12 cm2 strips deposited 10 cm below the soil surface. Membranes remained in the soil for 20 days. A set of membranes were placed at the burned and unburned sites during June, July and August in order to observe changes in nutrient concentrations over the growing season. At the end of the 20 days, membranes were removed, rinsed with deionized water and extracted using 35 mL of 2M KCl. Between sampling periods, membranes were recharged using 0.5M HCl to remove lingering ions and then 0.5M NaHCO3 to neutralize the strips.

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.