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  • 1
    Digitale Medien
    Digitale Medien
    Interannual variation and climatic regulation of the CO2 emission from large boreal lakes (2005)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 11 (2005), S. 0 
    Details
    ISSN: 1365-2486
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Energietechnik , Geographie
    Notizen: We studied the interannual variation of surface water partial pressure of CO2 (pCO2) and the CO2 emissions from the 37 large Finnish lakes linking them to the water quality, catchment and climate attributes in 1996–2001. The lake water CO2 was measured three times a year in the study lakes in 1998 and 1999 and for the rest of the years the CO2 was modeled by measured alkalinity. The median annual CO2 emission to the atmosphere ranged between 1.49 and 2.29 mol m−2 a−1. The annual CO2 emission followed closely the annual precipitation pattern with the highest emission during the years when the precipitation was highest (r2=0.81–0.97, P〈0.05). There was a strong negative correlation (r2=0.50–0.82, P〈0.001) between O2 and CO2 saturation in the lake water during stratification suggesting effective decomposition of organic matter in the lakes. Furthermore, total phosphorus and the proportion of agricultural land in the catchment had significant positive correlations with CO2 saturation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2486.2005.00982.x
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  • 2
    Digitale Medien
    Digitale Medien
    A large carbon pool and small sink in boreal Holocene lake sediments (2004)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 10 (2004), S. 0 
    Details
    ISSN: 1365-2486
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Energietechnik , Geographie
    Notizen: Model-based estimates suggest that lake sediments may be a significant, long-term sink for organic carbon (C) at regional to global scales. These models have used various approaches to predict sediment storage at broad scales from very limited data sets. Here, we report a large-scale direct assessment of the standing stock and sedimentation rate of C for a representative set of lakes in Finland. The 122 lakes were selected from the statistically selected Nordic Lake Survey database, they cover the entire country and the water quality represents the average lake water quality in Finland. Unlike all prior estimates, these data use sediment cores that comprise the entire sediment record. The data show that within Finland, aquatic ecosystems contain the second largest areal C stocks (19 kg C m−2) after peatlands (72 kg C m−2), and exceed by significant amounts stocks in the forest soil (uppermost 75cm; 7.2 kg C m−2) and woody biomass (3.4 kg C m−2). Kauppi et al. (1997). The Finnish estimate extrapolated over the boreal region gives a total C pool in lakes 19–27 Pg C, significantly lower than the previous model-based estimates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2486.2004.00848.x
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  • 3
    Digitale Medien
    Digitale Medien
    Midsummer spatial variation in methane efflux from stands of littoral vegetation in a boreal meso-eutrophic lake (2003)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 48 (2003), S. 0 
    Details
    ISSN: 1365-2427
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: 1. Spatial variation of methane (CH4) efflux from the littoral zone of a meso-eutrophic boreal lake was studied with a closed-chamber technique for three summer days in 22 vegetation stands, consisting of three emergent and three floating-leaved species.2. Between-species differences in CH4 emission were significant. The highest emissions were measured from the emergent Phragmites australis stands (0.5–1.7 mmol m−2 h−1), followed by Schoenoplectus lacustris 〉 Equisetum fluviatile 〉 Nuphar lutea 〉 Sparganium gramineum 〉 Potamogeton natans. Within-species differences between stands were not significant.3. In P. australis stands, the stand-specific mean CH4 emission was significantly correlated with solar radiation, probably indicating the role of effective pressurised ventilation on CH4 fluxes. The proportion of net primary production emitted as CH4 was significantly higher in P. australis stands (7.4%) than in stands of S. lacustris and E. fluviatile (both 0.5%).4. In N. lutea stands, CH4 efflux was negatively correlated with the mean fetch and positively with the percentage cover of leaves on the water surface. There were no differences in CH4 efflux between intact N. lutea leaves and those grazed by coleopteran Galerucella nymphaeae. In S. graminaeum and P. natans stands, CH4 effluxes were not related to any of the measured environmental variables.5. For all vegetation stands, the biomass above water level explained about 60% of the observed spatial variation in CH4 emission, indicating the important role of plants as gas conduits and producers of substrates for methanogens in the anoxic sediment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2427.2003.01113.x
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