Fig. 2.
Properties of investigated soils and their remineralization, nitrification and N2O production rates. Soil samples were taken at 6 different sites: K1 (cliff, former polygon center) in two depth 3.8 and 4.0 m below the ground surface, K2 (cliff, former polygon wall, close to the ice wedge), 1.0 m below the ground surface, P7 (polygon wall), depth 10–20 cm, B4 (beach, primary vegetation cover), 0–5 cm and 10–20 cm, B5 (beach without vegetation cover), 10–20 cm and 25–35 cm, Sed6 (sediment in the Lena) as surface sediment. Organic matters were measured by combustion at 550 °C; NO3− and NH4+ were extracted by 0,0125 M KCl; remineralization and nitrification rates were measured by incubation of soil in Lena water; N2O production rates were measured after soil samples were transported to Germany