n-Alkane characteristics of Arctic soils, comparing different large herbivore grazing intensities under permafrost and non-permafrost conditions

• Main Authors: Windirsch, Torben, Mangelsdorf, Kai, Grosse, Guido, Wolter, Juliane, Jongejans, Loeka Laura, Strauss, Jens
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: Arctic; AWI Arctic Land Expedition; B1; B2; B3; biogeochemistry; CACOON; Carbon; organic; total; CH19-B1; CH19-B2; CH19-B3; CH19-U1; CH19-U3; Changing Arctic Carbon cycle in the cOastal Ocean Near-shore; Cherskiy; Russia; Cherskiy 2019; Deposit type; DEPTH; soil; Depth comment; Event label; Fennoscandia; FI20-E-1M-A; FI20-MR; FI20-PR; FI20-S-2M; FI20-S-3M; FI20-S-3P; FI20-S-4P; FI20-S-5F; FI20-S-5M; FI20-S-5P; FI22-E-1M-B; FI22-S-2P; FI22-W-3P; FI22-W-4M; FI22-W-4P; FI22-W-5M; FI22-W-5P-A; FI22-W-5P-B; FN-Land_2020_Inari; FN-Land_2022_Inari; Gas chromatography - Mass spectrometry (GC-MS); grazing; Grazing intensity; Kaamanen; Finland; Northern Finland; permafrost; Thermokarst; Siberia
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.963258; https://doi.org/10.1594/PANGAEA.963258

These data originate from soil samples collected on several field campaigns, aiming at identifying impacts of large herbivore activity on soil carbon storage and degradation in permafrost (northeastern Siberia (68.51 °N, 161.50 °E); campaign in July 2019) and seasonally frozen Arctic ground (northern Finland (69.15 °N, 27.00 °E); campaigns in September 2020 and June 2022). The samples were collected in transects across grazing intensity gradients, spanning over 5 different intensities: 1 - no grazing / exclosure sites (Siberia: 23 years; Finland: 50 years) 2 - occasional animal migration (Siberia: year-round; Finland: seasonal) 3 - daily animal migration (Siberia: year-round; Finland: seasonal) 4 - high-frequency daily animal migration (Siberia: year-round; Finland: seasonal) 5 - pasture / supplementary feeding sites (Siberia: year-round; Finland: seasonal) Samples cover different ground types and seasonalities, which are marked out in the site names: B - drained thermokarst basin U - Yedoma upland P - peat M - mineral soil (podsol) E - exclosure (Finland-specific) S - reindeer summer ranges W - reindeer winter ranges In this context, 'grazing' refers to any animal activity exerted by large herbivorous animals, including browsing, trampling and defecation. Values were measured following the lab procedure after Jongejans et al. (2021): 1. Lipids were extracted from the freeze-dried and homogenised samples using accelerated solvent extraction (ASE). For this, we used a ThermoFisher Scientific Dionex ASE 350, equipped with dichloromethane / methanol (DCM / MeOH 99:1 v/v) as the solvent. Samples were hold in a static phase for 20 minutes (heating for 5 minutes to 75 °C a 5 MPa). Extracts were subsequently concentrated using a Genevac SP Scientific Rocket Synergy evaporator at 42 °C. 2. Internal standards for compound quantification (5α-androstane for n-alkanes, 5α-androstan-17-one for n-alcohols) were added. 3. Asphaltenes (n-hexane-insoluble compounds) were removed by asphaltene precipitation. 4. The remaining ...