Small-scale hydrological variation determines landscape CO2 fluxes in the high arctic

Sjogersten, Sofie; van der Wal, Rene; Woodin, Sarah. 2006 Small-scale hydrological variation determines landscape CO2 fluxes in the high arctic. Biogeochemistry, 80. 205-216.

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We explored the influence of small-scale spatial variation in soil moisture on CO2 fluxes in the high Arctic. Of five sites forming a hydrological gradient, CO2 was emitted from the three driest sites and only the wettest site was a net sink of CO2. Soil moisture was a good predictor of net ecosystem exchange (NEE). Higher gross ecosystem photosynthesis (GEP) was linked to higher bryophyte biomass and activity in response to the moisture conditions. Ecosystem respiration (R e) rates increased with soil moisture until the soil became anaerobic and then R e decreased. At well-drained sites R e was driven by GEP, suggesting substrate and moisture limitation of soil respiration. We propose that spatial variability in soil moisture is a primary driver of NEE.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Programmes pre-2009 publications > Biodiversity
UKCEH and CEH Sections/Science Areas: _ Ecosystem Dynamics
ISSN: 0168-2563
Additional Information. Not used in RCUK Gateway to Research.: The original publication is available at
Additional Keywords: high Arctic, carbon dioxide fluxes, spatial variability, soil moisture, vegetation
NORA Subject Terms: Agriculture and Soil Science
Ecology and Environment
Atmospheric Sciences
Date made live: 14 May 2008 07:55 +0 (UTC)

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