Journal
BIOGEOCHEMISTRY
Volume 80, Issue 3, Pages 205-216Publisher
SPRINGER
DOI: 10.1007/s10533-006-9018-6
Keywords
high Arctic; carbon dioxide fluxes; spatial variability; soil moisture; vegetation
Funding
- Natural Environment Research Council [CEH010021] Funding Source: researchfish
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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.
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