Variation in CO₂ and CH₄ fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia

Abstract 2) and methane (CH4) budgets are highly uncertain. We measured CO2 and CH4 fluxes, vegetation composition and leaf area index (LAI), thaw depth, and soil wetness in Tiksi (71∘  N, 128∘  E), a heterogeneous site located within the prostrate dwarf-shrub tundra zone in northeastern Siberia. Using the closed chamber method, we determined the net ecosystem exchange (NEE) of CO2, ecosystem respiration in the dark (ER), ecosystem gross photosynthesis (Pg), and CH4 flux during the growing season. We applied a previously developed high-spatial-resolution land cover map over an area of 35.8 km2 for spatial extrapolation. Among the land cover types varying from barren to dwarf-shrub tundra and tundra wetlands, the NEE and Pg at the photosynthetically active photon flux density of 800 µ mol m- 2 - 1 800 and Pg800) were greatest in the graminoid-dominated habitats, i.e., streamside meadow and fens, with NEE800 and Pg800 of up to - - 2 - 1 800 and Pg800 and, on a landscape scale, the fens were disproportionately important for the summertime CO2 sequestration. Dry tundra, including the dwarf-shrub and lichen tundra, had smaller CO2 exchange rates. The fens were the largest source of CH4, while the dry mineral soil tundra consumed atmospheric CH4, which on a landscape scale amounted to - 4 balance during the growing season. The largest seasonal mean CH4 consumption rate of 0.02 mmol m- 2 - 1 2 and CH4 flux patterns, especially the consumption of atmospheric CH4, when estimating tundra C exchange on a larger spatial scale.

Angaben zum Objekt

• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Variation in CO₂ and CH₄ fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia ; volume:19 ; number:13 ; year:2022 ; pages:3151-3167 ; extent:17 ; Biogeosciences ; 19, Heft 13 (2022), 3151-3167 (gesamt 17)

Beteiligte, Orts- und Zeitangaben

• Urheber: Juutinen, Sari ; Aurela, Mika ; Tuovinen, Juha-Pekka ; Ivakhov, Viktor ; Linkosalmi, Maiju ; Räsänen, Aleksi ; Virtanen, Tarmo ; Mikola, Juha ; Nyman, Johanna ; Vähä, Emmi ; Loskutova, Marina ; Makshtas, Alexander ; Laurila, Tuomas

Weitere Informationen

• DOI: 10.5194/bg-19-3151-2022
• URN: urn:nbn:de:101:1-2022070705204190137373
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Letzte Aktualisierung: 15.08.2025, 07:36 MESZ